In the vegetable greenhouse in winter, the environment of low temperature, high humidity and low sunlight is conducive to the occurrence of various diseases, such as blast, root rot, stem rot, gray mold, late blight, downy mildew, anthracnose, bacteria Sexual soft rot, etc., will also be accompanied by physiological diseases, such as hypothermia, deficiency symptoms (calcium deficiency dry edge).
In addition, root-knot nematode diseases on melons, solanaceous fruits, and beans are characterized by early infection and rapid occurrence in old sheds and heavily cropped plots. In recent years, the special climate has caused a high incidence of thrips, yellow tea mites and various viruses, which requires attention.
"Host, pathogen, and environment" constitute the "disease triangle", if "human intervention factors" are added, it will constitute the "disease tetrahedron". The comprehensive plant protection strategy is as follows:
Strategy 1: When changing crops, clean the fields in advance, and reduce the number of pathogenic bacteria and insect eggs in the shed to a minimum by spraying and combining.
Strategy 2: After planting, slow the seedling stage, flush or irrigate a line of defense agent, such as Bacillus cereus, Abamectin + 963 root nutrients. Severe plots can be used in acupoints or trenches to prevent and control offensive line 3 before planting.
Strategy 3: Reduce humidity to the maximum limit. Pour small water frequently and drip irrigation under the film; after watering, close the shed to heat up and then release the air to dehumidify; pay attention to the treatment of the wet land in the front of the shed; spread rice husks between rows to keep warm and reduce humidity.
Strategy 4: Early detection, early ******. Always observe the front and back sides of the stems and leaves at the front of the shed and the air outlet. For small insects, observe the heart leaves and the inside of the flower. Use protective agents such as chlorothalonil and copper preparations. Once the disease is ill, fight with the "protection + ******" medicine.
Common pest control formula: anthracnose: chlorothalonil + difenoconazole or prochloraz; bacterial slip: copper quinolate or thiamphenicol + calcium fertilizer; thrips hazard: spinosad or ethyl poly Cyclomethoxin (can be equipped with food attractant);
Red and white spider hazards: acetonitrile, spirodiclofen, fenpyramate, etc., apply in the evening, spray the whole plant and the ground;
Viral diseases: Qinspong Sun God, Ateling + Kedubao + Amino Acid Leaf Fertilizer or Bihu, or Virus A + Ningnanmycin + Boron Magnesium Zinc Leaf Fertilizer + Brassinolide.
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