The main diseases of greenhouses in summer squash are courgette powdery mildew, zucchini brown spot, courgette gray mold, zucchini cotton rot, and squash mosaic virus disease.

powdery mildew:

1. Symptoms mainly occur on the leaves. The seedling stage and the adult stage are all onset. White, round and round white spots appear on the foliage, and the whole leaves are covered with white powder.

2. Disease conditions The bacteria live on the sick body and spread by airflow. Severe onset of high temperature and high humidity.

3. Control methods:

(1) Pay attention to ventilation to prevent condensation.

(2) Chemical control, can be used 2000 times 20% Triadimefon EC, 50% Sulfur Suspension 400 times, 50% Sulphur Suspension 200 times, spray every 5 to 7 days, and even spray 2 or 3 times.

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