Diseases of zucchini: description with photographs and methods of treatment

Anthracnose

Anthracnose is a fungal disease. It often appears precisely when grown in open ground. Weak or damaged plants suffer the most; the stage of development is not important. In addition, the fungus attacks zucchini growing in soil with high acidity or lack of potassium and phosphorus.

With anthracnose, leaves become covered with yellow or brown spots. They quickly increase in size, later spreading to the stem, flowers and fruits. Gradually the plant rots and the harvest loses quality.

If the disease is still at an early stage, it will be enough to treat the shoots with a 35% solution of colloidal sulfur, a 1% solution of Bordeaux mixture or EM preparations. If anthracnose goes too far, it will most likely not be cured.

For prevention, you should follow the rules of crop rotation, treat the seeds before sowing, weed the ground in time, and remove plant debris from the site. Systematic disinfection won't hurt either.

Pest Control

Let's find out which harmful insects are most dangerous for zucchini, and what can be done about this scourge.

Spider mite

This insect is especially harmful to those zucchini that are grown in greenhouse conditions, but it can also affect plants outdoors. The mite settles on the underside of the leaves, weaving its webs here: this is precisely the first sign of infection. If measures are not taken, the mite will lead to the death of the entire bush: the leaves of the plant begin to dry out.

Spider mites on zucchini

They fight this scourge with onion solution. To do this, put onions through a meat grinder, and then dissolve a glass of the resulting caustic slurry in a bucket of water. To enhance the effect, you need to add tbsp. a spoonful of pepper, 2-3 spoons of ash, and 1 spoon of soap solution. Everything is shaken, filtered, and then used to spray the bushes. When infected with spider mites, there should be two procedures: the second is carried out -6 days after the first.

But is it possible to plant zucchini and squash next to each other, and what planting rules are outlined in the article.

What is the scheme for planting squash in open ground, and how planting work is carried out, is described in this video.

It will also be useful to learn about how to plant zucchini seeds in open ground: //gidfermer.com/sadovodstvo/ovoshhevodstvo/kak-posadit-kabachki-semenami-v-otkrytyj-grunt.html

You may also be interested in learning how to get a good harvest of cucumbers.

melon aphid

This insect is also a long-time enemy of zucchini. Aphids settle on the lower part of leaves, as well as in ovaries, flowers and shoots. Parts of the plant affected by the insect dry out, curl, and die. In addition, the defeat of zucchini by melon aphids leads to a slowdown in the growth and development of zucchini.

Melon aphid on zucchini

To cope with aphids, you need to spray the bushes with a solution of karbofos. In addition, it is important to destroy weeds in a timely manner, since this is where aphids move from. All affected plant parts must be removed and burned. It’s also worth learning more about what you can plant after zucchini.

Whitefly

This insect threatens zucchini in July. The whitefly settles on the bottom of the leaves and reveals itself as a sticky, slimy coating. Over time, the affected leaves begin to wither.

Whitefly on zucchini

To cope with the problem, you need to spray the bushes with Confidor (1 ml of product per bucket of water) or Phosbecid (5 ml of product per bucket of water). In addition, it helps to wash away pests from the leaves with strong water pressure. It will also be useful to learn about the best zucchini seeds for open ground.

Sprout fly

This pest attacks young zucchini seedlings by climbing inside the stems. Thus, the fly can ruin the standing crop, preventing the zucchini from even surviving to flower.

Sprout fly

For preventive purposes, it is necessary to dig up the beds in the fall, and also plant the seeds not too deep when planting.

But when to plant zucchini in open ground, and how planting work occurs, is described here.

Bacteriosis

Bacteriosis is a dangerous disease of zucchini that affects not only parts of the plant, but also the crop. It appears in the form of small brown ulcers. The fruits are ugly, irregularly shaped and of very poor quality.

For treatment, all affected areas should be removed. If the bacteriosis has not yet developed too much, then treatment with 1% Bordeaux mixture or 0.4% copper oxychloride solution will help.

There is also an apex variety of the disease. The upper parts of the fruit first turn yellow, and then brownish-brown spots appear. The lower part can easily grow further. As bacteriosis develops, the zucchini becomes glassy and rots. It is not possible to cure the culture; it will have to be disposed of.

Brown spots on zucchini leaves

Colored spots of all shades of red and brown can even seem pretty. But most often it is a fungus that gradually spreads to other plantings.

— Cladosporiosis manifests itself in the form of dark spots that have a rich olive color;

— If the brown spots are rather grayish and spread throughout the plant, this is ascochyta blight. Sometimes during illness small ulcers appear and gum is secreted;

— If brown spots spread across the beds too quickly, treat the zucchini against fusarium;

— With bacteriosis, the affected areas not only change color, but also look oily;

— Bacterial spotting provokes brown spots on the leaves, which gradually turn into areas of rotting and ulcers.

Photo: prostayaferma.ru

Powdery mildew

Powdery mildew is a disease of zucchini that appears as white streaks on the leaves. At first it may seem that it is just dirt, which is why many summer residents do not react to the problem in time. Therefore, the disease manages to capture most of the plant and also spread to neighboring plantings. Once the white coating turns brown, there is a risk of losing a lot of crops.

On zucchini, powdery mildew causes foliage to dry out and die. The active development of the disease occurs either in very hot or excessively rainy weather. Most often, spores of the causative fungus remain from last year.

If white dew spots are found on the plant, the damaged areas should be removed immediately. The most important thing is to act carefully so that the spores do not fall on other parts of the zucchini or neighboring plantings. It is recommended to burn the resulting material immediately.

Experts also recommend thinning the beds so that the crop receives enough light. Feeding stops for a while. After this, treatment is carried out using fungicides: Baktofit, Alirin, Fitosporin-M. Traditional recipes in this case are not so effective, but you can prepare a solution of potassium permanganate (a bucket of water + 2.5 g of the drug) or an infusion of cow humus (take water and raw materials in a ratio of 3 to 1, infuse the mixture for 3 days).

It is best to carry out preventive measures so that powdery mildew does not appear on the site at all. To do this you need to do the following:

1. Clean out your garden at the end of the season and burn any plant debris.
2. Before the onset of winter, the earth is dug up. This allows the spores to be destroyed by cold.
3. It is important to follow the rules of crop rotation and plant zucchini and other vegetables in a new place every year.
4. Systematically weed and thin out the beds, properly water and fertilize the crops.
5. Inspect the plant frequently, especially if the weather is very hot, to promptly respond to symptoms.

List of zucchini pests

Not only the listed diseases are dangerous for vegetable crops, but also some pests. We will find out further why they attack zucchini and how to get rid of them.

Slugs and garden snails

Description. These are gastropods, reaching a length from 2-3 cm to 10 cm, their body is thick, worm-like, completely covered with mucus. Snails have the same description, only their body is located under the shell. In sunny and dry weather, these pests hide in damp and secluded places, but with the onset of darkness they attack vegetable crops in the garden.

Signs of defeat. The mollusks gnaw the embryos in the seeds, eat the leaves on the seedlings and gnaw the stems, which leads to the death of the entire plant. When young zucchini appear, they also eat the pulp in them and even make moves. They not only reduce yields, but also spoil the presentation of vegetables, leaving behind mucus and other secretions.

Control measures. Mechanics are considered a primitive method of fighting slugs. It involves collecting shellfish by hand or using special traps made from pieces of canvas or plywood and placed around the entire perimeter of the site. You can also dig protective furrows up to 30 cm wide around the seedlings and fill them with pine needles, sand or sawdust to prevent the passage of pests. You can also use metaldehyde granules (4 g per 1 sq.m), a solution of copper or iron sulfate, or lime against them.

Sprout fly

Description. These are small gray flies with a dark longitudinal line on the belly. Reach 3-5 mm in length. Flies lay eggs under clods of earth. After 5-10 days, white larvae appear, narrowed in front, with teeth at the end of the body and up to 7 mm long, capable of destroying all crops in 2 weeks, especially in cold summer conditions. The larvae then pupate. In the warm season, 2-3 generations of insects may appear.

Signs of defeat. Pests can be found on plant seedlings. The larvae destroy germinating seeds, gnaw and penetrate the stem. As a result, the young plant may die.

Control measures. If you dig deep into the ground in the fall and add manure, this will be an excellent preventive measure. In the spring before the start of the summer season, it is worth adding Karbofos or Fufanon to the soil. Seedlings can be pollinated with wood ash, ground black pepper or tobacco dust. A saline solution (200 g per 10 liters of water) is suitable for watering.

melon aphid

Description. Aphids are small (3 mm) insects that not only gnaw leaves, young shoots and buds, but also carry dangerous infections. Female aphids are wingless, have an oval body 1.25-2.1 mm long and are dark green or black in color. The larvae are yellow or green, with or without wings. The insect reproduces asexually and produces 14-20 generations per season.

Aphids develop on weeds, on which they hibernate, but with the arrival of spring and the air warming up to + 12 ° C, they move to pumpkin plants, including zucchini. The optimal temperature for its life is + 16... + 22 ° C. Colonies of adult parasites and their larvae settle on the underside of leaves, shoots, ovaries and flowers.

Signs of defeat. The melon aphid eats green tops, causing the shoots, leaves and flowers to turn yellow and curl, then dry out and fall off. With a large pest invasion, the flowers fall from the bush. The plant is stunted and then dies.

Control measures. To prevent aphid infestation, the following crops should be planted near the garden:

• spicy plants (mint, coriander, fennel);
• flowers (lavender, marigolds);
• garlic, onion, mustard, basil.

You can also repel zucchini pests with soapy water (100 g per 10 liters of water) and a sprinkle of powdered sulfur.

If a small number of pests have already settled on the plant, then gentle folk remedies can be used to combat them:

• Tobacco infusion. To prepare it, add 1 part of the raw material to 10 parts of water and leave for a day. Dilute the composition with water in a ratio of 1: 3 and use to treat leaves.
• Infusion of yarrow. Within 2 weeks, 1 kg of raw material should be dissolved in 10 liters of water and then used for its intended purpose.

Sick plants can be treated with such an effective microbiological agent as bitoxybacillin. It should be prepared a few minutes before use. To do this, the substance must be diluted with water at the rate of 80-100 g per 10 liters of water. You can use the composition to treat the plant every 10 days. Among other drugs, it is also worth highlighting a 10% solution of Karbofos (60 g per 10 liters of water) or Trichlorometaphos-3 (50-100 g per 10 liters of water).

Whitefly

Description. It is a small polyphagous insect, white or slightly yellowish in color, whose body is covered with dusty pollen and is up to 2 mm long. Outwardly it resembles a moth. Adults and larvae infect zucchini in June, settling at the bottom of the leaf blade. They eat leaves and young shoots, sucking out their nutritious juices and at the same time infecting them with various diseases.

Signs of defeat. Insects first attack young shoots (leaves). They are easily recognized by the bright spots that appear on the surface. During their life, the larvae secrete a sticky mass, which prevents the leaves from developing and serves as a favorable environment for the development of fungi. Adult insects eat the plant and leave feces, then black spots appear on it. As a result, affected specimens become discolored, curl, and gradually wither. In this case, the buds become deformed, dry out and fall off.

Control measures. To prevent the death of the plant, it can be sprayed with garlic or tobacco infusion (you can add liquid soap) every 3 days. The leaves should be additionally sprayed with settled water. If there is a strong invasion of whiteflies, the bushes and the soil around them can be watered with insecticidal solutions. The following drugs are effective:

• Aktara;
• Aktellik;
• Double effect;
• Commander;
• Tanrek;
• Oberon.

After watering, it is worth loosening the soil.

Spider mite

Description. A sucking parasite with an oval-oblong body 0.3-0.4 mm long. The eggs are spherical in shape and greenish-transparent in color. Ticks overwinter in groups under plant debris, and even in the surface layer of soil at a depth of 30-60 mm. Most often they appear in June and settle on the underside of zucchini leaves. The larvae hatch from the eggs within 5-7 days. During the season, ticks produce up to 15 generations, each of which develops in 10-28 days.

Vashchenko Petr Nikolaevich

Agronomist of vegetable farming of GC JSC "Petroovoshch"

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Signs of defeat. Mites attack the underside of leaves and leave a thin web. Yellow spots appear on damaged areas, which gradually spread over all leaves and lead to their drying out. In severe cases, zucchini dies.

Control measures. To get rid of spider mites, you can take the following measures against them:

• in hot weather, treat the leaves with infusion of garlic or onion peel (200 g of raw material, pour 10 liters of water and leave for 2 days);
• sprinkle with infusion of black pepper (crush the pepper, pour 50 g into 10 liters of water) with the addition of liquid soap (1 tbsp.) and wood ash (3 tbsp.);

The composition must be left for a day, then strained and used to process zucchini every 7-10 days.

• spray with a 20% solution of chloroethanol (20 g per 10 l of water) or irrigate with a 10% solution of isophene (60 g per 10 l of water);
• spray ground sulfur at the rate of 300 g per 100 sq.m.

To improve the adhesive properties of any solution, you can add 30 g of grated laundry soap.

Fusarium

Fusarium is a fungal disease that affects the quantity and quality of the crop. Initially, the root system is affected, then the spread of the disease spreads to the leaves of the zucchini and its stem. The plant gradually dies.

To combat fusarium, it is necessary to cover the lower part of the shoots and roots with wood ash. If the fungus has spread very much, you will have to use drugs such as Fitosporin or Sporobacterin (according to the instructions). Experts also advise working on improving the health of the land: sowing green manure, watering it with a solution of the EM preparation. It is worth remembering that fungi die in neutral or calcium-rich soil. After harvesting, it is necessary to destroy plant debris.

Zucchini leaves are curling

When the leaves curl into tubes and take on a strange shape, you urgently need to understand what’s going on. We cannot rule out a virus that may spread further throughout the beds!

— If the beds are planted too densely, then the large leaves do not have enough air and light, so they wrinkle and wither;

— Verticillium wilt in the early stages leads to leaf curling;

— If there is not enough light for zucchini seedlings, they will not only turn pale, but will also curl up. This happens because the plant tries to preserve all the valuable substances in more promising parts.

Photo: 2sotki.ru

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Mosaic

Mosaic is a disease of zucchini caused by a virus. She has several types, each of which deserves attention.

Cucumber mosaic

The virus is usually carried by weeds and then spreads to crop plants. Zucchini leaves become covered with spots of yellow, white and green, the plate itself twists, and bumps appear on it. There will most likely be no harvest from a diseased plant.

For prevention, the area should be properly treated against pests, since the mosaic can be infested with aphids, ants, and Colorado potato beetles. Aktara is used for this purpose.

Before sowing, the seeds are treated. Equipment is disinfected after use. You should also constantly remove weeds. It is impossible to cure mosaic; affected crops must be removed immediately.

Green speckled mosaic

This disease spreads to zucchini and cucumbers. Young foliage loses color, wrinkles, and then dies. The plants become very weak, the fruits are warty and have an atypical color.

If a disease is detected, it is recommended to remove the affected crops and replace the contaminated soil. Seeds should be taken only from healthy individuals and soaked in a 15% trisodium phosphate solution before planting.

White mosaic

White mosaic is considered even more dangerous than green. The leaves become covered with star-shaped spots, but do not wrinkle. The fruits are covered with yellow and white stripes. It is worth remembering that the virus persists both in seeds and in plant debris. The control measures are the same as for other types of the disease.

Root rot

Root rot occurs due to excess organic matter in the soil. In addition, it develops due to incorrect temperature conditions, weak immunity of the crop, watering with cold water or soiled garden beds.

The lower leaves turn yellow and wither, gradually the disease spreads to other parts of the squash: the shoots turn brown and the roots die.

For the purpose of prevention, the seeds are treated 3 weeks before planting, using Thiram.

If it seems that the disease has attacked the crop, then you need to add soil to the stem so that the zucchini produces new roots. It is advisable to water the sick individual with a 0.1% Previkur solution. In case of severe infection, the plant should be removed from the garden bed and disposed of by burning, and the soil should be treated with copper sulfate.

Leaves turn yellow and dry out

Zucchini leaves can turn yellow for various reasons, and some of them are an ordinary natural process. But sometimes this is an alarming symptom, especially if the upper plates are affected!

— When the leaves do not have enough moisture, they dry out, but if they are watered excessively, they turn yellow and rot;

— Small dry spots on visually healthy leaves remain due to sunburn;

— If the yellow spots intertwine into a continuous abstract pattern, the zucchini suffers from mosaic. The virus cannot be treated, and infected plants will have to be destroyed;

— Faded yellow spots of peronosporosis gradually become darker and grow every day.

Photo: 2sotki.ru

Diseases of strawberry leaves: descriptions with photos, treatment

White rot

The disease causes zucchini tissues to turn white, soften, and become slimy. The disease occurs due to too active watering of the crop and excessively dense plantings. Fungal spores are especially active during fruiting, so there is a risk of losing the entire harvest.

You should reduce watering and, if possible, use only settled warm water. Top dressing is acceptable, but only non-root. If white rot is widespread, experts advise removing all leaves and powdering the cut areas with crushed charcoal. Such manipulations can only be carried out in hot and dry weather.

For prevention, just follow simple rules:

• plant zucchini in a new place every year;
• Disinfect seeds before planting;
• observe the interval between bushes when planting;
• dust the ground with wood ash;
• control the amount of water when watering.

Ascochyta blight

The disease is caused by a fungus and affects the entire plant. It appears as black spots, the diseased parts soften and die. This usually results in the squash being lost. If the soil is watered too much, ascochyta blight also affects the root system. The fungus develops especially actively in conditions of high soil and air humidity, as well as low temperatures. It remains on plant remains, so they must be burned.

To prevent the pathogen from appearing on the site, it is necessary to constantly remove weeds, and after harvesting, properly dispose of the remains. It is important to remember the rules of crop rotation and not break them. It is advisable to change the affected soil.

The affected areas on the stem are dusted with powder made from copper sulfate and chalk (1 to 1) and crushed coal so that ascochyta does not spread.

The most common zucchini diseases

Important!

Zucchini diseases usually cannot be treated. And if, only some and in the initial stage. Here, prevention plays the main role. And this is a fact. Next, let's look at all the diseases that zucchini can get.

Anthracnose or copperhead

Zucchini diseases such as anthracnose are transmitted by the fungus Colletotrichum. Typically, plants in greenhouses are affected. But there are exceptions when zucchini in open ground get sick. This happens if weather conditions contribute to it. By the way, the disease can appear at any stage of development. Infection occurs through wounds on the plant and fruit. And also, usually, weak plants get sick.

The disease manifests itself

in the form of yellow and brown spots that appear on the leaves. At the same time, the spots have a dark brown or purple border. Next, they grow, and then they move to other parts of the plant. At the same time, depressed brown spots form on the stem, fruits and flowers. Growing both in width and depth, they block the flow of nutrients. And as a result, the fruits become wrinkled and bitter. Subsequently, the process of rotting begins. Note that if the disease spreads to the root system, the plant usually dies.

Control measures

. In serious cases, diseased plants are removed. The best option is to burn them. But, if you need to fight, then we use solutions of Bordeaux mixture or colloidal sulfur for treatment. Biofungicides are also suitable. For example, phytosporin. Also, the disease can be transmitted through seeds. What to do with them is written at the beginning of the article. But, in more detail about preparing seeds, read in this article.

Ascochyta blight

Zucchini diseases such as ascochyta blight are spread by a fungus of the genus Ascochyta. And this happens due to high humidity and low temperatures.

The fungus can attack any part of the plant. And this is expressed by light black spots on the stem and leaves. At the same time, black specks are visible. These are fungal pycnidia. The disease mainly affects nodes on the stem. And here, we observe blackening of the diseased areas. And they become soft and then dry out. As a result, the plant dies.

The fight consists of treating with copper-chalk powder (copper sulfate and chalk 1 to 1). You can also sprinkle it with crushed coal.

Bacteriosis

Caused by bacteria. And they begin to actively reproduce under favorable conditions. Such conditions include high humidity and large temperature changes. Bacteria can be transmitted through water, insect vectors and plant debris. Also, seeds can be infected.

If you have angular leaf spot

, then dark green spots form on the leaves. And they turn brown, dry out, and then simply fall out of the leaf. And then you get holes in the sheet. In the future, the fruits become covered with sores. And then they become deformed.

In the case when we have apical bacteriosis

, then here, the zucchini first turns yellow, and then becomes covered with brown spots. Then they just rot. And at the same time, there is a putrid smell.

If the plant is neglected, it is impossible to help it. Therefore, we simply remove diseased plants. Better yet, burn it. Seed and soil treatment play a major role here. Here, you can soak the seeds in a solution of zinc sulfate 0.2%. Or we use any other fungicide for treatment. At the beginning of the article, this moment is described, read. We remember that it is easier to prevent a disease than to treat it. You can read this article about fungicides.

Sclerotinia or white rot

Zucchini diseases, such as white rot, are transmitted by a fungus. The fungus can be spread by the wind, and at the same time, spores fall into the wounds of the plant. But, for the fungus to multiply, favorable conditions are needed. And this is an excess of nitrogen in the soil, thickened plantings, temperature changes. All this contributes to the disease.

Signs of white rot appear in the appearance of a flaky coating on any part of the plant. And then, fungal spores form. And they appear in the form of black dots. Next, the sore spots soften. And then, they become covered with mucus, rot and die. There is a failure in fruiting.

At the first sign

can be treated with a mixture of chalk and copper sulfate powder in a ratio of 1 to 1. At the same time, you can sprinkle the sore spots with crushed coal. By the way, instead of coal, a 0.5% solution of copper sulfate can be used.

And yet, it is important to reduce the humidity level in the greenhouse

. And this can be done with the help of ventilation. Moderate watering also helps reduce humidity.

It will be useful to feed zucchini

a solution containing 1 g of zinc sulfate, 2 g of copper sulfate and 10 g of urea per 10 liters of water. But, at the same time, you need to feed it with phosphorus fertilizers. And yet, calcium is needed for normal development. And it can be added in the form of ground eggshells or ash at the rate of 200 g per 1 sq. m. m.

On a note!

It will be useful if treated with a solution consisting of 1 g of zinc sulfate, 1 g of copper sulfate and 0.5 tbsp. spoons of urea. You can also spill the soil with phytoavalanche. And to maintain microflora we add compost or humus.

Root rot

The disease usually appears during fruiting. Basically, this happens due to the abundance of fertilizing, or due to temperature changes. And yet, watering with cold water (less than + 20 ° C) is harmful.

Signs of illness . First, the neck of the stem rots, and then the roots. Sore spots become rotten and soft. But the color of infected tissues can be dark and brown. At the same time, the lower leaves turn yellow. And then, the growth of the plant stops, while it withers and then dies.

If you suspect a disease, you need to sprinkle the stem with earth. And then new roots will appear. Next, water with 0.1% previcur. At the same time, 200 g - 300 g of solution is used for 1 bush. You can also use fungicides with the active ingredient Metalaxyl. For example, Rapid Mix, Metaxil. Oh, we remove all diseased plants. For example, we burn it. But then the soil will have to be treated with copper sulfate.

Mosaic

Zucchini diseases such as yellow mosaic are transmitted by a virus. Pathogens can be transmitted by insect vectors. For example, aphids, thrips and whiteflies. Infection through seeds is also possible. And we also note that pathogens can easily overwinter on plant debris. Note that viruses live in the soil for several years. And they are very tenacious.

Symptoms appear

in the form of yellow-white spots on the leaves. Further, the spots grow, and then the leaves curl. Note that the disease begins with the upper leaves and gradually moves to the lower ones. By the way, you can see white and yellow stripes on the affected fruits.

Control measures

. Unfortunately, it is impossible to cure the disease. You just need to remove all diseased plants and burn them. And the soil needs to be changed or treated. For planting, we use only seeds treated with fungicides.

Fusarium or fusarium wilt

Fungal disease. Where the root system is affected. Can happen at any stage of development.

First signs

. The upper leaves turn yellow and weaken. And the stem in the root part turns brown and becomes covered with a pink coating. Then, the process of rotting begins. By the way, when cut, you can see brown veins. Further, when the disease reaches the root system, the plant dies within a few days.

In the initial stage, you can dust the area around the bush with ash. Here, prevention plays a major role. Therefore, we feed the plant and improve the soil. For example, we plant green manure. We treat the seeds and soil with fungicides. We observe crop rotation.

Powdery mildew (ML)

Zucchini diseases such as powdery mildew are fungal in origin. The pathogens overwinter in the roots of perennial weeds. These are sow thistle, plantain, etc. And under favorable conditions, the fungus spreads to zucchini. This is especially facilitated by excess humidity, excess fertilizer with nitrogen, and irregular watering.

Symptoms

. They appear mainly on the leaves. But, sometimes it can appear on the stem. At the same time, small rounded white spots resembling a flour coating form on the leaves. Over time, they grow and eventually the entire leaf becomes covered with a white coating. Further, the leaf turns yellow and dries out. This stops photosynthesis and the plant dies. At the same time, fruit formation is impossible because the fungus takes all the nutrients. This means that fruits will not be able to form.

The fight consists of spraying with a solution of colloidal sulfur 35%. Also, a 0.5% sodium phosphate solution is suitable for this. And yet, a 10% isophrene solution may be useful. Alternatively, you can powder with ground sulfur at the rate of 300 g per 100 sq. m. m.

Downy mildew or peronosporosis

Fungal disease. Where, the plant can be affected at any stage of development.

Signs

. First, yellow spots appear on the outside of the leaf. Which, on the other hand, are covered with spores of a gray-violet fungus. The spots grow, turn brown, and the leaves dry out.

Control measures

. When infected, we use Bordeaux mixture, topaz, oxychome, copper oxychloride solution and growth stimulants. Before planting, you need to soak in a solution of potassium permanganate or pickle in hot water for 15 minutes - 20 minutes.

Gray mold or botrytis

Diseases such as gray mold are transmitted by fungus. This is putrefactive mycosis. Spores can be found on weeds, and the disease can also be transmitted when flowers are pollinated by insects. Factors that contribute to the disease include temperature changes and high humidity, excess or lack of nutrients, and watering with cold water.

Symptoms

. Leaves and ovaries mainly suffer from this disease. At the same time, they become watery and covered with a gray coating. Also, you can see black dots. These are fungal pycnidia that can live in the soil for up to 2 years.

The fight occurs in the same way as with white rot.

Good luck to you!

Brown olive spot

Brown olive spot affects fruits. If the air humidity is high, then it affects seedlings, foliage and stems. Zucchini quickly begins to increase in size, their skin cracks, and they become ugly.

Spotting develops especially quickly with constant temperature changes or in cold, rainy summers. The causative agent of the disease remains in the ground and on crop residues for a long time.

It is important to monitor the density of plantings so that they are well ventilated and adequately water the zucchini. The infected soil is replaced. Treatment using Bordeaux mixture (100 g of lime + 100 g of copper sulfate) shows good results.

Preventing zucchini from diseases

Prevention of all fungal, bacterial or viral diseases of zucchini is the same, so we will talk about it first. So, the following actions will help minimize the risk of contracting the disease:

• observe crop rotation; zucchini can be grown in one place once every 3 years;
• monitor the condition of the soil, use fertilizers wisely; a deficiency or excess of elements can become a good environment for the development of pathogenic fungi;
• water the zucchini moderately; excessive air and soil humidity are ideal conditions for all diseases;
• pathogens live and overwinter on plant debris and seeds. Promptly remove all parts of infected plants and destroy them away from the garden. If you have to remove the bush completely, grab a lump of earth;
• Mandatory in the prevention of any diseases is pre-planting preparation - treating seeds with biofungicides. Inspect the seedlings carefully;
• do not thicken the plantings;
• Special attention should be paid to zucchini grown in greenhouses and greenhouses due to the special, humid microclimate of such premises. Monitor the plantings and do not forget about ventilation. If the disease is rampant in greenhouse beds, disinfection of the entire room will be required, and sometimes the soil will need to be replaced.