According to systematic observation and census results of strawberry pests and diseases, it was found that strawberry powdery mildew in greenhouses in some areas occurred sporadically. The temperature in the strawberry greenhouse is basically maintained at 15 °C - 20 °C, and the suitable temperature of the gas plus the humid and rainy climate fully meets the pathogenic conditions of strawberry powdery mildew. After the occurrence of powdery mildew in strawberries, the yield is generally reduced by 20%-30%, and the weight is up to 50%, and even the harvest is severe, which seriously affects the yield and quality of strawberries.
Therefore, farmers should pay attention to the prevention and control of strawberry powdery mildew in greenhouses. The prevention and control measures are mainly based on prevention, comprehensive prevention and control, and the combination of agricultural control and chemical control.
1. The selection of resistant varieties, rotation, rotation crops with cruciferous vegetables, beans is appropriate, Solanaceae crops and strawberries have a common disease should not be used as crop crops.
2. Rational irrigation, control the humidity inside the shed, and reduce the occurrence of diseases. Pay special attention to the enhanced ventilation to reduce the relative humidity inside the shed. The ideal relative humidity in the shed is about 60% in the flowering and fruit setting period and about 70% in the fruit expansion period.
3. Remove the old leaf disease leaves in time, and bring the old disease leaves out of the field for centralized destruction, reducing the chance of reinfection.
4. Rational fertilization to prevent partial application of nitrogen fertilizer.
5. Chemical control, optional 10% Shigao water dispersible granule 1000-1500 times liquid, 43% bacteriological gram suspension 3000-4000 times liquid, 12.5% ​​nitrile emulsifiable concentrate 2000-3000 times liquid, 40% Fuxing emulsifiable oil 5000 -8000 times liquid for the control of strawberry powdery mildew, have a good effect.
Strawberry flowering period generally can not spray, otherwise it is easy to produce deformed fruit. Powdery mildew is a disease that is more resistant to chemicals. It should be alternately used in production. The interval between application is 7-10 days. At the same time, it should not be mixed with other chemicals and micro-fertilizers to avoid phytotoxicity.
Screw Locking Wire Thread Insert
Threaded inserts have locking keys to hold them in place. These inserts are for metal applications; not recommended for cast iron or brittle material. Repair damaged threads with a positive mechanical lock, preventing rotational spinout from vibration or torque.
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