Prevention and control of Botrytis cinerea in zucchini

In recent years, the botrytis cinerea of zucchini in greenhouse is serious. According to the investigation, it can lead to a reduction in production, or even destroy the shed.

Zucchini Botrytis cinerea

Botrytis cinerea is harmful to flowers, fruits, stems, leaves and other organs of western cucurbit. the pathogen first invades from wilted female flowers. at the initial stage of infection, the petals are flooded or waterlogged, and then become soft and rot, resulting in gray brown mold layer, causing petals to rot, wilt and fall off. After the development of the pathogen to the young fruit, the injured part became soft and rotten, resulting in a large number of gray mold layer. If the diseased tissue falls on the leaf or stem, it can also lead to the disease of the stem and leaf, with irregular spots on the leaves, brown wheel lines in the center, and gray mildew layer can be seen when the humidity is high. Stem infection, the emergence of gray disease spots, around the stem for a week, can cause stem fracture.

Clean pastoral and greenhouse film: timely remove diseased leaves, diseased flowers, diseased fruits, etc., and take them out of the shed, buried or destroyed. Clean the greenhouse film, increase light transmittance, in order to improve the growth of zucchini and enhance disease resistance.

Adjust the temperature and humidity of the greenhouse: using high border film mulching or drip irrigation cultivation method, timely watering, as far as possible to maintain a higher temperature in the morning, can inhibit the sporulation of bacteria and make the dew in the greenhouse atomized and evaporated. Increase the amount of air release in the afternoon, reduce the humidity in the shed, and appropriately increase the temperature of the shed at night to reduce or avoid leaf condensation.

Prevent germs from invading from the wound: when dipping flowers with 2meme 4murd, it is easy to cause wounds and is conducive to bacterial invasion, so when dipping flowers, you can add carbendazim and other fungicides to control the invasion of bacteria. In addition, in agricultural operations, wounds should be avoided as far as possible to reduce the human transmission of diseases.

Pay attention to the application method: in the process of chemical control, spray should be reduced as far as possible so as not to increase the humidity in the shed. Aerosol or dust agents can be used alternately to slow down the drug resistance of zucchini gray mold.