At present, the temperature continues to decline, which is detrimental to the production of vegetable in facilities, and in particular, the humidity in the protected area is prone to increase due to the reduced ventilation time, which causes and aggravates diseases such as gray mold, sclerotinia, late blight, and other diseases of low temperature and high humidity. The vigilance in production should be heightened. Take the following measures to prevent: 1 strengthen monitoring. Pay close attention to the weather forecast and the dynamics of disease occurrence, make cold insulation work according to weather changes, and add warming and lighting enhancement equipment if necessary. 2 Reasonably vent the air to remove moisture. When the temperature is high at noon on cloudy days, proper ventilation is also required. When the temperature is fine, do not suddenly open all the straw curtains. Open them one at a time or one at a time, and then gradually uncover them after the plants adapt. 3 Strictly control watering, avoid watering on cloudy days; loosen soil in time, increase ground temperature, and promote new roots. 4 timely medication. Prevention of gray mold, sclerotinia disease, can use 50% procymidone wettable powder, creumabine 65% methylthiomycin wettable powder, Shijiale 400 g/litre pyrimethanil suspension agent spray, or per acre With 15% Procymidone smoke 250 to 300 grams of smoke. For the prevention of late blight and downy mildew, it is possible to use Kelu 72% cream urea manganese zinc wettable powder 600 times liquid, or Jin Lei 68% fine amazan manganese water dispersion granule 600~800 times liquid, or fasting net 52.5 % Ketone cymoxan water dispersible granules 1800 times, or Amisida 25% azoxystrobin suspension 1500 times spray; can also be used before the onset of 45% chlorothalonil smoke agent 250 ~ 300 g smoke Smoke prevention. The spray should be uniform and careful, to avoid the liquid drip or dripping along the leaves, silicone additives can be added to the liquid to improve the control effect.
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