The prevention and control methods of Phytophthora blight, know the control methods of edible fungus diseases

Symptom

Phytophthora blight is distributed all over the country. Under the condition of continuous high temperature, the leaves and flowers produce waterlogged brown rot, the diseased part is covered with imperceptible white mold layer, and the diseased part is grayish brown when dry. Pedicels and petioles also suffer.

The pathogen was caused by Phytophthora [Phytophthorasp.] infection.

Occurrence regularity

When the air humidity is high and the temperature is about 20 ℃, it is most beneficial to the disease. Keeping warm and humid in greenhouse in winter and watering in spring become more serious with the increase of air temperature.

Prevention and cure method

1. Carry out formula fertilization to improve the stress resistance of the plant.

2. Watering in sunny days, timely ventilation and dehumidification after watering in greenhouse.

3. In the early stage of the disease, the following application methods are available: commonly used spray agents include 25% metalaxyl wettable powder 600 times, 40% carbendazim 250 times, 58% metalaxyl manganese zinc wettable powder 500 times, 40% copper wettable powder 700 times, 64% poisonous alum 500 times or 77.2% Purek water 800 times. When growing in greenhouse and greenhouse, aerosol can be applied.