How to prevent low temperature and high humidity diseases in shed vegetables

At present, the temperature continues to fall, and the low temperature is unfavorable to the production of greenhouse vegetables. In particular, it is easy to increase the humidity in the protected area due to the reduction of ventilation time, causing and aggravating the low-temperature and high-humidity diseases such as gray mold, sclerotinia, and late blight, and should be vigilant in production. Take the following measures to prevent:
Timely medication
For the control of gray mold and sclerotinia, 50% procymidone WP, 6% metformin-Mulberry WP, or Sjiale 400g/L of pyrimethanil suspension can be used, or each Acre with 15% procymidone smoke agent 250 ~ 300 grams of smoked tobacco. For the prevention and treatment of late blight and downy mildew, you can choose Kelu 72% cream urea·manganese zinc wettable powder 600 times liquid, or Jinlei 68% fine nail cream·manganese zinc water dispersible granule 600～800 times liquid, or fast Net 52.5% ketone·Cream-Cyanide water-dispersible granules 1800 times solution, or Amishida 25% azoxystrobin suspension 1500 times solution spray; can also use 45% chlorothalonil smoke agent per acre before the onset 250~ 300 grams of smoke prevention. The spray should be even and meticulous, avoiding the dripping or spilling of the liquid into the leaves. Silicone additives can be added to the liquid to improve the control effect.
Strengthen monitoring
Pay close attention to the weather forecast and disease occurrence dynamics, do a good job of cold insulation and heat preservation according to weather changes, and add heating and lightening equipment if necessary.
Strictly control watering
Avoid watering on cloudy days, loosen the soil in time, increase the ground temperature, and promote new roots.
Reasonable air release
If the temperature is high at noon on cloudy days, it should be properly ventilated. After the weather is clear and the temperature rises, do not suddenly uncover all the straw curtains. You should first expose one by one or one by one, and then gradually uncover the plants after adaptation.