First, the symptoms
Botrytis cinerea mainly damages leaves and stems, and can be infected from the seedling stage to the adult stage.
1, infected at seedling stage. The leaves and young stems are rotted and rotted, and the diseased area has a gray mold layer.
2, leaves infected. From the mature leaves near the ground, the initial onset of water-soaked small spots, expanded to gray-brown irregular shape, in the case of continuous rain and humidity in the field, the disease quickly expanded, spread to the internal leaves, a layer of thick when the humidity The dense layer of gray mold is the conidial stem and conidia of the germ.
3, stem disease. At the base of the stem, water-soaked small spots are produced. After the expansion, the lesions surround the stems one week. When the humidity in the field is high, a layer of thick and dense layer of moldy mildew is formed, and the stems and leaves of the aboveground parts wither and the diseased plants gradually dry and die.
Second, prevention measures
1, pass rotation. Promote 2-3 years of rotation with non-Asteraceae vegetables, or with Gramineae crops.
2, thickness and soil preparation. Application of fully decomposed organic fertilizer, adequate base fertilizer, deep sorghum cultivation, frequent cleaning of the ditch, to prevent water damage caused by rain.
3, strengthen the cultivation and management. Suitable sowing, planting, and reasonable close planting, greenhouse cultivation pay attention to ventilation, and attention to regulate the shed within the small climate, ecological disease prevention, so that plants grow robust and improve disease resistance.
4, clean up the pastoral. Immediately after the harvest, the diseased plant residues are removed and transported deep outside the field or burned to reduce the incidence. At the same time, the soil is deeper and the decay of the sick body is accelerated.
5, chemical control. At the beginning of the onset of spraying, spraying once every 7-10 days, continuous spraying 2-3 times. Pharmaceutics can choose 40% Shijiale Suspension 800-1000 times liquid (75-100 grams per mu dose), 50% Suo Keling wettable powder 800-1000 times liquid (100-125 grams per mu dose), 50% sea Due to wettable powder 1000 times liquid (100 grams per mu) and so on.
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