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Why strawberries turn yellow: the main diseases and pests, methods of dealing with them

Why strawberries turn yellow: the main diseases and pests, methods of dealing with them



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Fragrant garden strawberries have long been recognized as the queen of berries. Juicy and sweet, it occupies the first position in the ranking of summer fruits for fresh consumption and preparations. When growing this crop, numerous problems can arise, one of which is yellowing of leaves, peduncles, or even fruits. Dealing with this problem is not so easy. And the most important thing here is to determine the reasons why strawberries turn yellow.

Reasons for yellowing garden strawberries

Strawberry, despite its unpretentiousness, is highly sensitive to adverse environmental factors. Any deviation can provoke a decrease in plant immunity and, as a result, lead to infection by diseases, attack of pests. Even cultivation in compliance with all agricultural technologies sometimes ends with yellowing of the leaf blades of the plant, its stems, peduncles and fruits.

The list of situations that may affect the condition of garden strawberries and their appearance includes:

  1. Some fungal diseases.
  2. The activity of pests.
  3. Lack of trace elements and salts in the soil.
  4. Violations of agricultural technology.

Each of these situations requires an immediate response, which in most cases is associated with the processing of strawberry plantations by special means (chemical or folk) and the improvement of plant care.

Yellowing Strawberry Disease

There are not many diseases in which strawberries turn yellow. The most dangerous of them is wilt, or verticillus wilting. This disease affects the blood vessels of the plant, causing them to die. As a result of this, a gradual blanching occurs, and then yellowing of the entire aerial part of the plant.

Yellowness spreads from the center of the leaf blades to the petioles and peduncles, and the plant itself looks as if it lacks moisture. Young strawberry plants, affected by verticillar wilting, are very slow in growth, form very small leaf blades on shortened but undeformed petioles.

You can get rid of the fungus on an already infected plant with the help of Trichodermin and Fundazole. When the disease spreads to neighboring beds, all infected plants are removed and burned, and the soil is shed with a solution of iron sulfate.

It is possible to prevent the appearance of verticillus wilting if a variety or several varieties resistant to this disease are planted on the site:

  • VIRa;
  • Redgotlide;
  • Purple;
  • Carnival;
  • Mascot;
  • Spasskaya.

Also, strawberries turn yellow when the plants are infected too much with various spots. This is due to a lack of plant nutrients obtained during the breakdown of chlorophyll.

Why do strawberry bushes dry

Straw pests that make it yellow

Among all pests of strawberries, yellowing of plants can be caused only by mites (strawberry and arachnoid) and raspberry-strawberry weevil.

Strawberry mite It propagates mainly in wet weather, and affects only young plants. As a result of the activity of strawberry mites, leaf blades are deformed and turn yellow. The spider mite prefers to breed in dry weather, and settles on plants of all ages. You can detect the pest under the leaflets on which numerous bright spots appeared with a diameter of not more than 0.5 mm.

Mite control measures consist in observing crop rotation and the optimal planting pattern of strawberries (30-35 x 60-70 cm). Pest infected plants are treated with a solution of Karbofos or Actellic. Folk remedies are also used: infusions of dandelion, tomato tops and wormwood. With continuous infection, the plantations are watered with Karbofos from a watering can, then covered with a film. After about an hour, the beds are opened, and the plants are mowed and destroyed.

To prevent ticks from appearing on strawberries, it is recommended to warm young seedlings in hot (up to 45 degrees) water for 3-5 minutes, followed by cooling in cold water.

Raspberry and strawberry weevil, unlike ticks, prefers to damage peduncles and fruits. Its activity becomes noticeable by the appearance of drying out peduncles with yellow flowers or drying out ovaries. In the absence of reaction from the gardener, this small bug can destroy the crop completely.

To destroy the pest, infusions of hellebore or wormwood are used, as well as chemicals - Iskra-M or Karbofos.

Imbalance of trace elements and minerals

Strawberry in some cases turns yellow due to an excess or lack of trace elements and essential minerals. This happens in the following situations:

  • with an acute lack of nitrogen (the whole plant becomes pale, and then turns yellow evenly);
  • with a lack of potassium (a light yellow border appears on the leaf blades);
  • with a lack of magnesium and manganese (mainly lower, more adult leaf blades turn yellow);
  • with a lack of sulfur (the top of the shoot turns yellow), as well as with its excess (leaves turn yellow from the edges of the plate);
  • with a deficiency of iron and zinc (mainly young leaves turn yellow);
  • with an excess of phosphorus (yellowing comes from a lack of iron and zinc);
  • with an excess of manganese (turns yellow between leaf veins);
  • with an excess of calcium (mesylchic chlorosis appears);
  • with an excess of molybdenum (widespread slight yellowing of leaf blades).

In most cases, to return the plants to their normal state, additional application of fertilizers (preferably complex) to the soil is required, and microelements by foliar feeding (spraying).

When there is an overabundance of mineral components and trace elements in the soil, it is necessary to completely stop the application of mineral fertilizers due to which changes have occurred, or to normalize the ratio of certain elements in the soil by increasing the content of antagonist elements in it.

How to protect wild strawberries from gray rot

Growing strawberries in a personal plot is an interesting and very grateful occupation. Fragrant sweet berries will delight the gardener every season, if disease prevention is followed and pests are prevented. A timely fertilizer of the plot also plays a role without an “overdose” of essential nutrients.