Ways to combat diseases and pests of strawberries
Growing strawberries is not an easy task, because in addition to a whole range of agrotechnical measures, the gardener will have to deal with all sorts of diseases and pests. How to recognize them and take effective measures, we will consider in this article.
Signs of defeat
Garden strawberries are one of the most delicious summer berries. A healthy bush should have strong stems and leaves, bulk hard berries. However, it does not always happen the way the summer resident wants, especially the beginner.
Many factors can lead to diseases and the spread of pests:
- improper care;
- dense landing;
- insufficient / excessive feeding;
- lack of the required amount of moisture;
- careless attitude to wintering.
The bad thing is that some diseases can have similar symptoms. And yet, you should understand the main signs of the defeat of garden strawberries.
- If the strawberries are dry, then most likely it is worth looking for the cause in rot. The plant is susceptible to fungus, bushes and foliage dry out and quickly become unviable.
- When a culture wilts, it means that its roots are damaged. The reason for this is the pests that live in the ground, for example, a bear. Also wilting can occur if strawberries don't get enough water.
- Twisted and drooping leaves indicate that pests such as aphids and spider mites have bred on them. Another reason is powdery mildew. Leaves can also curl due to improper watering.
- If the strawberries rot during the ripening period, this may mean the presence of root rot, which quickly causes the roots to become unusable. Another reason is constant, irregular watering, especially dense plantings. Water stagnates, the plantation is not ventilated, and similar symptoms occur.
- Strawberry leaves turn yellow when the crop is affected by chlorosis. This may also indicate that it is time to fertilize with nitrogen and magnesium. Yellow foliage is the result of an attack by a strawberry mite.
- When a plant does not bloom, it causes particular stress for the gardener. After all, such a culture does not bear fruit, there are no berries on it. There are several reasons. Firstly, the summer resident did not comply with the planting dates and planted the strawberries earlier or later than the deadline, so the bush will spend all its strength to take root properly. Secondly, in the area under the guise of strawberries, weed bushes are hiding, which are difficult to distinguish from the usual species. They never bloom. They need to be found and rooted out immediately. Thirdly, the gardener overfed the crop with nitrogen, which provoked accelerated foliage growth.
- Those who grow a variety like Victoria may notice that the strawberries have become sour, not sweet at all. The reason for this is improper watering, strong shade, high acidity of the soil.
- The spots are the result of a lack of nitrogen. They also appear when the gardener floods too much or, conversely, rarely supplies water to the culture.
- If you find an empty flower on a strawberry, it means that there was not enough pollination.Try to plant male and female flowers as close as possible. Still empty flowers are formed on bushes affected by the weevil, as well as on those that have frozen or have been in extreme heat for several weeks.
Major diseases
Strawberries are a crop prone to many diseases. The gardener must always be fully armed in order to notice and recognize the symptoms of a particular disease in time.
late blight
This disease is very dangerous, it rapidly "jumps" from bush to bush, capturing the entire garden. The berry becomes small, acquires a brown tint, rots.
If the attack attacked during the formation of the ovaries, there may be no fruits at all.
Fusarium
This is a fungal disease, which is also transmitted by bushes through each other. The main sign is the lowering of the bushes to the ground. Rosettes quickly dry out, leaves and roots turn black and die.
Fusarium wilt most often occurs in extreme heat, and the fungus that caused it is very tenacious.
Anthracnose
Such an ailment can affect not only garden strawberries, but everything that is in the garden. It occurs at high humidity, quickly spreading to all crops. Sores appear on the stems, and large dark spots appear on the leaves. The roots are gradually dying off.
If you find anthracnose on berries, in no case eat them, as this can cause severe poisoning.
Rotten
There are several types of rot that affect the entire plant.
Gray rot
The most pernicious disease due to its swiftness. It develops in just two days, being transmitted to the bushes through water and air. The bushes turn brown, wither, dark spots grow on the berries, and the roots become unusable.
white rot
The only way to transmit misfortune is air, so spores easily fly from one bush to another. Affects all berries in the area of its influence. The fruits begin to rot, a whitish fluff appears on them. Then the leaves turn white and die.
Rhizoctonia (black rot)
The disease can only be detected by digging up a bush. If you notice that something is wrong with the plant, remove one bush and examine it. Black rot affects the root, causing its necrosis. Black spots and rings will be visible on the entire surface.
powdery mildew
The onset of the disease is characterized by the appearance of a strange white coating on the lower leaf plate. Then such a plaque spreads further - to the upper part, and then to the stem. The fruits are deformed, it is impossible to eat them. A plant affected by this disease dies very quickly.
spotting
There are three types of spots - white, brown and brown.
- With white spotting, spots appear on the foliage with a white center and a dark border. The plant begins to wither, the leaves fall off. The cause of the disease is an abundance of moisture, overfeeding.
- If small dark spots appeared on the culture, which subsequently merged into one large one, this means that the plant suffers from brown spotting. Such bushes die quickly, as there is no sap flow in them. Be careful - the fungus that caused the attack will return next year if no measures are taken.
- With brown spotting, oblong brown spots with a purple rim appear on the leaves. This ailment greatly weakens strawberries, in winter it can die.
parasites
Unfortunately, not only the gardener claims to plant strawberries, but also various pests. And you have to worry about everyone - insects, slugs, even birds.
Slugs
Slugs are disgusting-looking pests that occur in conditions of high humidity. In the daytime, they are practically invisible, as parasites do not like sunlight. But at night they gnaw leaves and berries, damage the stems.
You can detect the consequences of their stay by slippery shiny tracks.
Weevil
The weevil is a tiny gray beetle that loves to gnaw on the stalks. In winter, the weevils hibernate in the immediate vicinity of the plant, and in the spring they wake up and lay their eggs right in the strawberry buds. The hatched larva eats the entire inside of the bud, and there it turns into an adult insect. The cycle starts again.
Chafer
The Maybug is a headache for every gardener, because this insect is simply omnivorous. It will not be possible to destroy the larvae in advance, since the cunning parasite lays them at great depths. Such pests damage the roots, and as adults, the leaves and fruits.
Ants
We all know from childhood that ants are hard workers and real defenders of their home. In small quantities, they are even useful, but if there are entire colonies of them, urgent action needs to be taken. The fact is that such insects can arrange an underground anthill right in the roots of plants, which, of course, will lead to the death of the culture. And also through their fault aphids appear, which eat leaves and fruits.
Aphids are a huge danger, because they quickly carry various diseases throughout the site. In addition, the bushes infected with aphids become weak, ovaries and berries are hardly formed on them.
Nematode
A nematode is a worm that is almost invisible to the human eye. You can find it only when extracting a bush from the ground.If you carefully examine the roots, you will notice that they are all covered with whitish ulcers. The plant itself will slowly wither, the leaves will curl. The fruits will turn out deformed, sometimes they don’t even turn red.
Important: after the suspicion of a nematode is confirmed, wash your hands thoroughly and treat them with an antiseptic, wash your clothes at a high temperature. The fact is that this parasite can also penetrate into the human body, causing infection.
strawberry mite
Another insect that you can't see. It is carried through dirty tools, earth, gardener's clothes. Develops only in conditions of high humidity.
The strawberry mite acts quickly, affecting the buds on the bushes. Thanks to his "work", the berries do not develop, the leaves turn yellow and curl, and the bush itself stops growing.
thrips
Thrips are most often found in inflorescences. These are the smallest bugs that infect the fruit. Strawberries become brown, shallow, it is not possible to eat them. If the insect has flooded the beds, characteristic silvery traces on the bushes will be visible.
spider mite
This is truly a "berry" insect, all gardeners know about it. Spider mite often chooses strawberries, raspberries, all types of currants. Very small, they suck the juice from the leaves, thereby stopping the flow of sap. With large populations, the bushes are covered with a barely noticeable cobweb.
Birds
Many summer residents believe that birds flying to the site are an excellent prevention of insects. However, this is not always the case. Indeed, in addition to insects, a large beautiful berry can also attract a random bird, which it will definitely taste. The next day, a whole flock will fly in, and it will not be easy for the gardener to cope with them. One such raid can deprive the entire seasonal crop.
Treatment Methods
Fighting diseases and pests is very difficult, because both have the ability to return. Nevertheless, without care and treatment, any plant will simply die, so you still have to develop a control strategy.
Treatment of diseases
It is recommended to cope with many diseases of garden strawberries with the help of chemicals.
- Late blight can be fought with drugs such as Quadris, Metaxil. It is also recommended to try "Fundazol" followed by careful loosening.
- If the plant is affected by Fusarium, immediately treat the plantation with Fundazol. At the first stage, the introduction of Trichoderma will be effective.
- Anthracnose is treated with Quadris and Ridomil. It is also a good idea to treat with 1% Bordeaux liquid.
- Bushes that have picked up gray rot are already sprayed with a three percent Bordeaux liquid. In addition, Switch will show good results. White rot is destroyed by Dezoral. Black, unfortunately, is not treated, only preventive measures will help here.
- To combat powdery mildew, Fundazol, Quadris, Topaz are used.
- The complex of measures for the treatment of all types of spotting includes spraying with Dezoral, Falcon, Ridomil.
All of these drugs are quite effective, however, always carefully follow the instructions for use indicated on the packaging of each product.
You can’t expect a great result from folk remedies, they are more suitable for preventive measures. However, there are several techniques that you can try in your garden.
- Mustard infusion. Dissolve two tablespoons of the powder in a bucket of water. The resulting mixture is poured over the culture.
- Kefir infusion. Take a choice of one of these products: kefir, whey, yogurt, dilute in ten liters of water. Strawberries are sprayed with this product twice a week.
- Garlic infusion. Chopped parts of green garlic are poured with five liters of water. Insist 48 hours, then spray strawberries.
- Ash infusion. I take 300 grams of ash, stir it in a bucket of water. Insist 24 hours, then you can apply.
These are not all recipes, many gardeners use a solution of iodine, manganese, fresh milk with the addition of soap.
Pest control
Destroy pests should be comprehensive. If they are visible to the eye, then you can collect them by hand, take them out of the garden, burn them or feed them to chickens who love such “desserts”.
- Digging shallow grooves into which ash or tobacco can be poured will help against slugs. You can also place salt on the site, rubbing the skin on it, the parasites will die. With large numbers of slugs, it is worth treating with the Thunderstorm preparation.
- It will not work to destroy the weevil with traps, only Karbofos and Aktellik will help here.
- The cockchafer can be harvested by hand by spreading a film under a tree. Do this in cloudy weather, when the insect is not too active. Also, such beetles do not like white clover, which can be planted nearby. A radical measure of the struggle will be the use of "Nemabakt", "Antikhrushcha".
- In the case of ants, poison-soaked traps can be set up. Well helps infusion of garlic, yeast, semolina scattered around. From insecticides, use Iskra, Fitoverm.
- The nematode is dealt with by pouring manure into the ground, in addition, the bushes can be treated with Heterophos.
- Strawberry mite is not treatable, so you have to keep the situation under control.Dig up and burn the most affected plants, destroy old and dried leaves.
- Against thrips, you can use "Decis", "Fitosporin". Good help and tincture of red pepper, yarrow.
- To combat spider mites, use "Fitoverm", "Vermitek". Soap and garlic solutions also work well.
- If the site was attacked by birds, you can cover the plantings with a net. An excellent result will be given by the installation of sparkling little things - old discs, silver medals, remnants of jewelry, New Year's "rains". Such glare will scare the birds. You can also purchase a special bird repeller.
Prevention
Any disease is a consequence of the fact that the gardener made a mistake at some stage. In order not to repeat them again, it is necessary to take preventive measures.
- Purchase only healthy seeds and seedlings.
- If you are growing strawberries for the first time, it is better to give preference to hybrid varieties that are resistant to many diseases.
- Don't forget the crop rotation rules. You can not grow a crop in one area for more than three years. The older the strawberry gets, the more diseases it will pick up.
- Remember that you can not densely plant a plantation. The optimal distance between the rows is 30 cm. This will allow air to penetrate, in addition, water will also nourish the soil better.
- Dig up and destroy any weeds that have appeared on the site.
- Observe all the necessary measures of agricultural technology: watering, mulching, cutting off the whiskers.
- Before the start of the new season, clear the beds, removing last year's leaves, because pests can winter in them.
- A good preventive measure would be the treatment of plants with Bordeaux liquid, this will help prevent a lot of diseases. After harvesting, the land can be fed with nitrogen, manure solution.
If the proposed methods were not enough - the disease nevertheless made itself felt, try to use the drugs so that they act on a whole group of pests. This will help save money and harvest, and at the same time it will become the prevention of new diseases. It is worth remembering that any treatment with chemicals cannot be used on berries. They will simply become unfit for food. Any spraying (except for folk remedies) is carried out before or after flowering.
See below for details.