1. Balsam pear rot disease
The bitter gourd rot is mostly pre-flowering. Stems and fruits can be susceptible to disease. The leaves first lose their luster. The initial stage is dark green water-stained lesions, which are irregular in shape and have no obvious edges. When the humidity is high, the disease minister has a thin layer of white mold, which is blue-white when dry and easily broken. The petiole and vines appear dark green water-stained soft rot, and the affected part is easy to overflow. When the melon strip is damaged, it is dark green depression. When the humidity is high, the melon strip is quickly soft and rot, and the minister is sparsely white, rot and smelly.
2. bitter rot incidence of epidemic
The pathogens are overwintered in the soil with mycelium, chlamydospores and oospores, and the spore sacs are produced by the overwintering bacteria in the next year. The spread of the wind and rain, irrigation water, etc., causing the disease, the disease incubation period is short, and the disease is in the field. Development is faster. The bacterium has high temperature and high humidity climatic conditions, and the suitable temperature for epidemics is 25-28 °C, and the relative humidity is above 90%.
3. Bitter integrated control measures Phytophthora rot
Comprehensive control measures should be taken to prevent and control bitter gourd rot.
1Adopting sorghum cultivation, avoiding flooding of large water, and timely draining after rain
2 rounds for change. The plots with heavy disease can be rotated with non-cucumber vegetables, which can effectively reduce the occurrence of diseases.
3 timely harvest, to avoid over-ripe melons, reduce the chance of disease, the first time to see the disease melon should be removed in time.
4 chemical control. In the early stage of the disease, timely spraying and controlling, the agent can be selected with 25% metalaxyl WP 1000 times solution, 75% Shidelecho wet powder 800-1000 times solution, or 77% homicide tainable powder 600 times solution, or 58% of metalaxyl Mn-Zn wettable powder 500 times liquid, the above-mentioned pharmaceuticals are used to exchange the diving wheel, and the town has achieved good control effect.
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