Papaya is prone to powdery mildew during seedling stage. This is a fungal disease. High temperature and high humidity are the cause of these diseases. The following describes the symptoms of papaya powdery mildew and the fungicides used to control papaya powdery mildew.
First, the symptoms: the disease is mainly harmful to the roots and neck and roots, seedlings and seedlings just after planting are more susceptible to disease. In particular, when the groundwater level is high or the drainage ditch is poor, the water is sticky and the soil is sticky.
First, the symptoms: the disease is mainly harmful to the roots and neck and roots, seedlings and seedlings just after planting are more susceptible to disease. In particular, when the groundwater level is high or the drainage ditch is poor, the water is sticky and the soil is sticky. At the early stage of plant onset, watery stains appeared on the stem base, then brown rot, leaves withered, plants died, and the roots of the diseased plants were browned and necrotic.
Second, the pathogen and the characteristics of the disease: the pathogen is Fusarium, the wintering of the pathogen in the soil, becoming the second year of infection, spread by flowing water. The disease is severely affected when the drainage is poor, the soil is sticky, the rainy year and the planting is too deep.
Third, prevention and treatment methods:
1. The shed should be ventilated and ventilated, light-transmitting, and the temperature and humidity should be lowered. The seedlings and planting areas should be well drained to avoid water accumulation.
2, avoid continuous cropping, and do not work with vegetable fields (especially the former 茬 is cucurbitaceae). Do not plant too deep when planting.
3. When the diseased plant is found to be removed, the fungicide ethylpyrrolol is used to control papaya powdery mildew. For crops that have already developed disease, ethylpyrrolol can play a very good therapeutic role, can eliminate pathogens that have invaded plants, and can significantly inhibit the spread of pathogens. This pesticide bactericide has no cross-resistance.
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