Introduction to the symptoms and control methods of zucchini gray mold

Zucchini is a vegetable rich in vitamin C and glucose. It is a member of the gourd family. As a stir-fried vegetable, it tastes crisp and light. Zucchini are planted in many places, improper management or environmental factors will appear Botrytis cinerea. Let's take a look at the symptoms and prevention methods of zucchini gray mold.

Symptoms of Botrytis cinerea in zucchini

Mainly harmful flowers, young fruits, leaves, stems or larger fruits. Botrytis cinerea first invaded from the abortive female flowers, the petals were flooded at the initial stage of infection, the flower surface was dense with white frost, and then became soft and rotten and grew into a gray-brown mold layer, resulting in petals rotting, wilting and shedding. From the diseased flower to the pedicel of young melon, the pedicel of young melon faded, gradually showed wet rot and atrophy, and produced gray mildew layer. Most of the fruits start to get sick from the tip, and the damaged parts first become soft and rotten, until the whole fruit is soft rotten, and the fruit surface produces a gray mildew layer. If the diseased tissue falls on the leaf or stem vine, it can also cause stem and leaf disease. The disease spot on the leaf is watery at first, then becomes light grayish brown, its edge is more obvious, sometimes there are gray mildew in the middle, sometimes there are inobvious brown wheel lines, forming irregular large spots. Stem vine disease appears gray-white disease spot, gray-brown mildew, around the stem after a week of fester, resulting in stem vine break, front melon vine death. The disease department is gray different from zucchini brown rot, the symptoms of the two diseases are similar but the pathogens are different, so the control methods and the use of fungicides are different, and attention should be paid to the difference in production.

2. control methods of Botrytis cinerea in zucchini

The main results are as follows: 1. High border plastic film grafting is adopted. Using black seed pumpkin as rootstock and zucchini seedlings as scions, grafting can increase the resistance of zucchini to Botrytis cinerea. In the process of agricultural operation, try to avoid causing wounds and reduce the man-made spread of diseases.

2. Hanging vine cultivation. When the zucchini grows to eight leaves, it begins to hang the vine.

3. Drip irrigation should be applied and watered at the right time. Keep the temperature as high as possible in the morning, and can make the dew in the shed atomized and evaporated, increase the air volume in the afternoon, reduce the humidity in the shed, and properly increase the temperature in the shed at night to reduce or avoid leaf condensation.

4. Potions and flowers. After the zucchini blossoms, 0.1% sulfamethoxazole or carbendazim and other fungicides are added to 2meme4murd every morning to effectively control the botrytis cinerea of zucchini.

5. Clean the greenhouse film, remove diseased flowers, leaves, fruits and other diseased tissues in time, and take them out of the greenhouse in time for destruction. In the later stage of production, it is necessary to clean up the old leaves in time, increase ventilation and light transmission, make the plant grow healthily and increase the ability of disease resistance.

6. Chemical control. At the initial stage of the disease in the shed, 2000 times of 50% Sukeling wettable powder was sprayed, or 1000-1500 times of 50% prohydantoin (isobarbazide) wettable powder was sprayed. Greenhouse cultivation, minimize spray, avoid increasing humidity in the greenhouse. 10% tofu smoke agent 3: 3.75 kg / ha, or 45% chlorothalonil smoke agent 3.75 kg / ha, fumigation for 3 hours.