Gray mold of zucchini is a fungal disease. The pathogen first invaded from the withered female flower, and then the pathogen gradually developed to the young fruit. The damaged part is softened and rotted first, and then a large number of botrytis cinerea layers are planted. It can also cause diseases of stems and leaves, with irregular large spots on the leaves and brown wheel lines in the center, which can cause the stems and vines to break after one week around the stems.

Symptoms of gray mold of zucchini

It mainly harms the flowers, young fruits, leaves, stems or larger fruits of zucchini. The pedicels of flowers and young fruits are soaked in water at first, and gradually become soft, and the surface is densely covered with gray-green mold, which leads to fruit atrophy, rot and sometimes black sclerotia.

Occurrence regularity of gray mold of zucchini

The pathogen is botrytis cinerea. Pathogens overwinter in patients and disabled people or in soil, and are spread by airflow. Pathogens like high humidity and low temperature, the optimum temperature is 18-23℃, and the relative humidity is above 90%, which is suitable for onset. Protected cultivation, cloudy in winter and spring, low temperature, high density, poor ventilation and light transmission, high humidity, so the disease is more serious.

Control method of gray mold of zucchini

(1) At the beginning of the greenhouse, use l0% sukeling smoke agent, 200 capsules per mu once. 250g or 45% chlorothalonil smoke agent, 2250g per mu, smoked 3 times. ② Use 2000 times solution of 50% Sukeling WP, or 50% iprodione WP 1000- 1500 times solution, or 65% metoclopramide WP (Wanmeiling L) 1000 times solution. 7. Spray 1 time every day, 2~3 times in total.