How to prevent vegetable gray mold

Gray mold is the most important and most troublesome disease on vegetables such as eggplant, tomato and cucumber. It is a fungal disease, which mainly afflicts the flowers, leaves and fruits of vegetables. It is easy to develop when it is high in humidity and low temperature, and it will lead to crop yield reduction or even failure in severe cases.

Occurrence

The gray mold disease occurs early and is popular. It reaches its peak in March and April every year. It mainly harms young fruits and young melons. It often causes young fruits and young melons to soften, shrink, rot and have a dense gray mold layer on the surface. When young fruit and young melon are attached to the stem, they can cause the stem to rot. The disease rate and disease rate were outbreaks within 7 to 10 days.

Botrytis cinerea is a kind of saprophytic bacteria. It likes to invade from spoiled branches and petals. Generally, it first attacks from the leaves on the leaves of the plants that are dry and then return to the tide. On the leaves, a "V" type lesion that expands from the edge to the inside is formed. And form a gray grape ear mold layer.
Dip route

1. After the bottom leaf is affected by the fertilizer, the pathogen is infected from the edge of the leaf.

2. The pollen is scattered on the leaves, causing the bacteria to invade.

3. Stem wounds or diseased leaves attached to the stem are susceptible to infection.
4. The wintering or residual pathogens in the soil invade from the base of the stem.
5. Botrytis cinerea invades from the residual petals.

6. dead petals, leaves attached to the fruit surface, so that the bacteria invade from the fruit surface.

Prevention

First, clean the shed environment, reduce the source of dyeing

Before planting, remove the wreckage and dead branches and leaves, and remove the diseased leaves, diseased flowers, diseased fruits and lower yellow leaves and old leaves in time. After removal, it is best to use plastic bags to close them and bring them to the outside for deep burial or burning. After cleaning, pay attention to hand washing, and then carry out other plant management operations to avoid the spread of germs caused by human factors.

Second, strengthen the shed facilities and plant management

(1) Improve cultivation techniques and strengthen field management. Double ridge film and under-film drip irrigation technology can reduce the humidity in the shed; watering should be carried out on sunny days in the morning, avoiding watering in rainy days; when the temperature reaches 25°C~30°C at noon, ventilation and dehumidification will increase the carbon dioxide and reduce the humidity. It is about 70%.

(2) Reasonable close planting according to the specific conditions and morphological characteristics of the variety. Application of base fertilizer based on decomposed farmyard manure, increase application of phosphorus and potassium fertilizer, prevent partial application of nitrogen fertilizer, make plants too dense and long, affecting ventilation and light transmission, and reducing plant resistance.

Third, improve plant resistance

(1) Select good varieties and strictly control the seedlings. The selection of disease-resistant varieties can improve the ability of tomato to resist gray mold. Whole plants were immunized after planting, the plants can enhance the immune system, promote plant phytoalexin immune substances such as lignin and other substances secreted stimulate plant hypersensitive response, timely block the spread of outbreaks of bacteria, to avoid cuts caused by Botrytis cinerea or crops.

Directly crossed pruning operation (2) to avoid contact with diseased leaves or fruit disease. Remove residual petals and stigmas in a timely manner to prevent pathogens from damaging the leaves or fruits of the plants through residual petals or stigmas.

(3) reducing the amount and concentration of hormones dip time spent. Improper use of hormones will cause the petals to stay out of the air. Even if the outside air is relatively dry, the dry petals will still have a large part of the humidity between the bracts and the fruit. Botrytis cinerea is easy to invade.


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