Symptoms and Control Measures of Botrytis cinerea in Greenhouse Strawberry
2024-01-04 21:07:45
Harmful symptoms
Botrytis can occur from flowering to fruit development at any time. Most of the disease starts from the flowering stage. The bacteria initially invade from the unsuccessful flower or the weaker part of the plant, causing the flower to appear light brown and necrotic and rot, producing a gray mold layer. Leaves mostly invade from the base of the old yellow leaf edge, forming a V-shaped yellow-brown spot, or infected from the falling part of the petals, forming a nearly round necrotic spot, there is no obvious ring pattern, sparse gray mold. Fruit infestation occurs because of spotting of fruit in contact with other rotting fruit, soil, or dripping water in the shed. The infected site initially turns white or light brown, and the symptoms can then extend to part or all of the fruit surface.
Control methods
Clean the greenhouse where the greenhouse is planted in the first year and remove weeds and sick plants in the greenhouse before planting. The sheds that are planted in high density are treated with high-temperature stuffy sheds or chemicals to disinfect the soil.
Cultivation measures are covered with high ridge mulch, reasonable planting density, drip irrigation and water-saving techniques, timely removal of sick plants, removal of old leaves, diseased leaves, diseased fruits, and proper removal from the shed. After the watering and the snow fog weather, pay attention to ventilation, adjust the room temperature humidity, improve the air and light transmittance of the shed.
In the early stage of disease occurrence, biological control was first used for biological control. With 99% mineral oil 200 times plus microbial fungicide 1 billion / CFU / g 600 times liquid spray, can effectively control strawberry gray mold.
At the beginning of chemical prevention, use 99% mineral oil 200 times plus 40% pyrimethanil suspension 800 times, or add 50% carbendazim wettable powder 800 times, or add 50% omeprazole WP 1200 times spray . When the humidity in the greenhouse was too high, 20% Pythium chlorothalonil 300g/mu was used. The use of two or more agents alternately works better.
Matters needing attention 1. Spraying is carried out after the dew condensation has subsided in the sunny morning, spraying the surface, leaves and leaves evenly. 2. Cannot be used together with alkaline pesticides and copper preparations. 3. When using fumigant, do the enclosure to improve the control effect. 4. When applying pesticides and fumigation, it is necessary to do a good job of safety protection so as to avoid incidents of poisoning.
Botrytis can occur from flowering to fruit development at any time. Most of the disease starts from the flowering stage. The bacteria initially invade from the unsuccessful flower or the weaker part of the plant, causing the flower to appear light brown and necrotic and rot, producing a gray mold layer. Leaves mostly invade from the base of the old yellow leaf edge, forming a V-shaped yellow-brown spot, or infected from the falling part of the petals, forming a nearly round necrotic spot, there is no obvious ring pattern, sparse gray mold. Fruit infestation occurs because of spotting of fruit in contact with other rotting fruit, soil, or dripping water in the shed. The infected site initially turns white or light brown, and the symptoms can then extend to part or all of the fruit surface.
Control methods
Clean the greenhouse where the greenhouse is planted in the first year and remove weeds and sick plants in the greenhouse before planting. The sheds that are planted in high density are treated with high-temperature stuffy sheds or chemicals to disinfect the soil.
Cultivation measures are covered with high ridge mulch, reasonable planting density, drip irrigation and water-saving techniques, timely removal of sick plants, removal of old leaves, diseased leaves, diseased fruits, and proper removal from the shed. After the watering and the snow fog weather, pay attention to ventilation, adjust the room temperature humidity, improve the air and light transmittance of the shed.
In the early stage of disease occurrence, biological control was first used for biological control. With 99% mineral oil 200 times plus microbial fungicide 1 billion / CFU / g 600 times liquid spray, can effectively control strawberry gray mold.
At the beginning of chemical prevention, use 99% mineral oil 200 times plus 40% pyrimethanil suspension 800 times, or add 50% carbendazim wettable powder 800 times, or add 50% omeprazole WP 1200 times spray . When the humidity in the greenhouse was too high, 20% Pythium chlorothalonil 300g/mu was used. The use of two or more agents alternately works better.
Matters needing attention 1. Spraying is carried out after the dew condensation has subsided in the sunny morning, spraying the surface, leaves and leaves evenly. 2. Cannot be used together with alkaline pesticides and copper preparations. 3. When using fumigant, do the enclosure to improve the control effect. 4. When applying pesticides and fumigation, it is necessary to do a good job of safety protection so as to avoid incidents of poisoning.
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