Awkwardness is a big supplement, but powdery mildew is a serious disease. Inadequate management of pests and diseases will also reduce the yield, and it will also affect the quality of cockroaches. Whether it has been found that powdery mildew, or not found, can not be taken lightly against the powdery mildew, prevention and control should be done. Here's an introduction to how to prevent powdery mildew.

symptom

Also known as leaf spot disease. The main damage leaves and fruits. The leaves were infected with round to near-circular lesions, with a size of 2-4 mm. The lesions were brown at the edges and gray in the center. Black and grey molds were often found on the leaves. Fruit infection also produces similar symptoms.

Pathogenic bacteria

The pathogenic bacterium was Iridium spp., which belongs to the fungus Subgeronia sp. The fruiting body was born on the back of the leaf, small, brown, brown; conidiophore brown, 3-7 clustered, narrower and lighter at the top, unbranched, 3-4 orthogonal or geniculate; Shape, marked scarring, multi-septum, size 48-1564-5.5 micron; conidia colorless, whip-shaped, straight or slightly curved, base near truncate, tip apex or pointed, septum, inconspicuous, size 66-1362-4 micron.

Transmission routes and conditions

The mycelia or conidia in the leaves of the dead leaves of the spruce or fall over with the disease in the soil in the winter, the conidia of the following year by wind and rain for the initial infection and re-infection, and expand the harm. High-temperature and rainy years, high soil moisture, humid air, lack of fertilizer in the soil, and weak plants are susceptible to disease.

Control methods

1. Use wolfberry seedlings, such as Ningjing No. 1. After the autumn leaves fall, the gardens will be cleaned in time to remove the diseased leaves and diseased fruits, and they will be deeply buried or burned to reduce the bacteria source.

2, to strengthen the cultivation and management, promote the application of Japanese enzyme fermentation system composting, increase phosphorus, potash fertilizer, and enhance disease resistance.

3. Initiate spraying of 70% mancozeb WP 500 times or 75% chlorothalonil wettable powder 600 times, 64% WP 50 times, 30% chlorofix suspension in June. 400 times liquid, once every 10 days, continuous control 2-3 times. The drug was stopped 7 days before harvest.

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