Bitter gourd is a common vegetable. Although bitter gourd tastes bitter, its use value is quite high. The occurrence of downy mildew causes severe reduction of bitter gourd. This article will introduce in detail the prevention and treatment methods of bitter gourd downy mildew.
From the perspective of avoiding disease, the humidity in the shed is preferably maintained at 90%-95%, especially to shorten the time of foliar condensation or to control it in an intermittent state. Due to the radiation effect of nighttime radiation on the surface temperature of the crop, the body temperature of the plant is sometimes lower than the temperature in the shed. When the humidity in the shed is saturated, when the temperature and the dew condensation temperature (dew point temperature) are equal, the surface of the plant is knotted. In addition, after sunrise, the surface temperature of the crop rises at a slower rate than the temperature. When the moisture of the soil surface evaporates and the relative humidity is close to saturation, the surface temperature of the plant is lower than the dew point temperature. Condensation also occurs in this case. It seems that condensation can occur in two situations, but the frequency varies depending on the region, season, and facility conditions. Management seeks to reduce the duration of foliar condensation.
In the early stage of the disease, spray 70% ethyl phosphine; manganese zinc wettable powder 500 times liquid, or 58% Rydmir; manganese zinc wettable powder 500-600 times liquid, 64% antivirus WP WP 500 times, 50% nail cream Copper or nail cream aluminum copper 600 times liquid, 72% frost urea manganese zinc (ke anti-linger) wettable powder or 72% DuPont's wet WP 800 times liquid, when the condition is serious, can spray 700 times liquid large amount, or change Use 69% Anke Mn-Zn wettable powder or water-dispersible granule 1000 times solution or 47% garnip WP 800-1000 times solution, 56% rely on mountain water to disperse micro-granules 700-800 times solution, bitter gourd to copper The agent should be used with caution in the seedling stage, and the dosage and concentration should be strictly controlled during the growth period to prevent phytotoxicity. When the bitter gourd downy mildew and powdery mildew are mixed, it can spray 69% Anke Mn-Zn wettable powder 1600 times liquid and 20% triazolone EC 2000 times, once every 10 days, continuous control 2-3 times. The drug was stopped 4 days before the harvest.
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