In December, the temperature in Zhejiang Province dropped significantly, and most vegetables and pests entered the wintering stage, and the degree of damage was reduced. At present, the overall pests and diseases of vegetables are moderately occurring. The pests are mainly Plutella xylostella, Pieris rapae, Aphis gossypii, A. striata, Aphids, Thrips, B. tabaci, Leaf miners, and snails. Among them, the cruciferous vegetables were rehabilitated in the field of Plutella xylostella, and some of the plants were re-emerged in the field of aphids and thrips, and the cruciferous vegetables and leaf snails were re-issued in some fields of aphids and thrips. The disease is mainly caused by downy mildew, sclerotinia, black rot and viral diseases. Among them, downy mildew and sclerotinia sclerotiorum occur on some parts of lettuce, and the incidence rate is over 50%. In addition, melons and fruits and solanaceous vegetables enter the seedling stage, and attention should be paid to seedling diseases such as rickets and blight. With the frequent intrusion of cold air, frost and freezing will occur in some areas, and the resistance of vegetables will be reduced, which will be beneficial to pests and diseases.
Strengthen field management and improve plant resistance. After the low temperature is coming or the cold wave is over, the foliar fertilizer containing amino acid and alginic acid can be sprayed with sodium nitrophenolate to improve the antifreeze ability of the plant. The facility vegetables should be ventilated and light-transparent during the daytime, and the membrane cover should be kept at night; the exposed vegetables should be covered with sunshade or film insulation at night. Timely removal of field diseased plants to the field for destruction. After harvesting, the soil is ploughed to reduce the number of original bacteria and insect source.
Scientifically prevent and control pests and diseases, and reduce pests and diseases. 1 physical and chemical control. Usability attractants trap the Plutella xylostella adult. When the trap is placed, the peripheral density is appropriately increased, and the density of the center of the inner ring is appropriately lowered. One set per acre is placed at a slightly higher position from the crop, and the greenhouse can be hung on the upwind when used. Use a yellow plate to trap 30 to 40 pieces per acre of aphids, beeswax, etc., hanging at the upper 15-20 cm of the plant, and adjust the height in time with the growth of the crop. 2 chemical control. Plutella xylostella can be sprayed with 10% cyanamide, dispersible oil suspension 2000 times solution or 45% methyl quinone urea dispersible granule 3000 times solution; 22% flonicamid can be selected in the initial stage of aphid Nitrile suspension 1500 times liquid or 10% flonica amide water dispersible granules 1500 times liquid spray control, focusing on planting young leaves and back of the tablet; Hummer can choose 60 g / liter of ethyl spinosyn suspension 1500 Spray or control of 10% cyanamide, dispersible oil suspension 2000 times solution, etc.; control snails may use tetraacetaldehyde granules or 5% carbaryl granules 0.50 kg per mu or point near the plant Rhizosphere soil table. Downy mildew can be sprayed with 68% fine nail cream, manganese zinc water dispersible granule 800 times solution or 18% oxazolamide suspension 1500 times liquid spray; Sclerotium disease can choose 38% azole ether · acyl bacterium Sprinkle 1000 times liquid suspension or 50% procymidone WP 1000 times liquid spray control, focusing on spraying the base and surface of the plant. In the seedling stage, the disease can be controlled by 68% fine nail cream·manganese zinc water dispersible granule or 80% mancozeb wettable powder 600 times liquid spray. It is recommended to use pesticides with different mechanisms of action to alternate rotation. It is strictly forbidden to use (limited) pesticides and strictly observe the safety interval.
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