Pay attention to strawberry powdery mildew in greenhouse

Powdery mildew is a common and important disease in strawberry cultivation in solar greenhouses. It mainly damages leaves, flowers and fruits. The leaves were infected. In the early stage, a thin layer of white mycelium grew on the back of the leaves. As the disease progressed, the leaves curled upwards in a spoon-shaped manner. Later, red-brown lesions appeared, and the leaf margins shrank to scorch; flowers were infected and the petals were pink. Buds can not be opened; fruit is infected, young fruit can not be normal expansion, fruit surface covered with white powder, loss of luster, poor coloration, seriously affecting the quality of strawberry fruit, or even loss of commodity value. The production practice over the years has proved that powdery mildew is an important disease that affects the production of strawberry in greenhouses. Once a disease is found, if it is not taken timely and effective prevention and control measures, it will cause serious losses of strawberry production.

At present, the strawberry greenhouse in the Beijing suburbs has been covered with plastic film insulation. This period is the initial stage of strawberry powdery mildew before flowering, and it is also a critical period to prevent strawberry powdery mildew from occurring. To this end, combined with the occurrence of powdery mildew in strawberry production in greenhouses last year, this year's control measures for strawberry powdery mildew in the greenhouse are as follows:

1, timely removal of old leaves, fruit, and brought to the deep outside the greenhouse, in order to reduce the source of infection.

2, sulfur fumigation control. In the greenhouse covered with mulch, a self-control fumigator is installed every 80-100 square meters and hangs in the middle of a greenhouse 1.5 meters away from the ground. To prevent the sulfur gas from hardening the greenhouse film, an umbrella can be placed above the fumigation machine. Objects, used to protect the film. In the fumigator, 20 grams of sulphur powder was contained, which was heated and fumigated in the early evening in the greenhouse. The time was 4 hours. Once every other day, fumigate 10 times.

3, the release of aerosol control. After the greenhouse cover is closed in the evening, add 2% of mycelia or 20% of chlorothalonil to each greenhouse (specification 50m and 8m) and place it evenly (make sure that the smoke agent lies alongside the ditch). After being ignited from the inside to the outside, people must quickly evacuate the greenhouse.

4, foliar spray control. Use 70% thiophanate-methyl 1000 times solution, or 50% carbendazim (tribecarpine) 3000 times solution, or 25% pyraclostrobin EC (Kairun) 2000-3000 times solution for spraying. Continuous spraying 2-3 times, spray interval 7-10 days, try to avoid using the same kind of fungicide for a long time.

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