In December, the temperature in Zhejiang Province dropped significantly, and most vegetable pests entered the overwintering stage, reducing the degree of damage. At present, the incidence of vegetable diseases and insect pests is generally moderate. Insect pests mainly include Plutella xylostella, Pieris rapae, Amorphophallus vulgaris, Yellow song strips, Aphids, Thrips, Whiteflies, Leaf flies, and snails. Among them, cruciferous vegetable plots of Plutella xylostella were re-emerged, some of the vegetable plots on the vegetable plot were re-emerged, and the re-emergence of the thrips, cruciferous vegetables and foliar snails. Diseases are downy mildew, sclerotia, black rot, and viral diseases. Among them, downy mildew and sclerotinia occurred on some lettuce plots with an incidence of more than 50%. In addition, fruits, vegetables, solanaceous vegetables into the nursery period, pay attention to damping-off disease, blight and other seedling disease. With the frequent intrusion of cold air, frost and freezing phenomena will appear in some regions, and the resistance of vegetables will be reduced, which will benefit the occurrence of pests and diseases.
Strengthen field management and improve plant resistance. After low temperature arrives or after the cold wave may spray with amino acids, alginate and other foliar fertilizer plus sodium nitrophenolate, improve plant antifreeze ability. During the day, the vegetables should be ventilated and light-covered at night, and the cover film should be kept warm at night; the open-air vegetables should be covered with a shade net or film insulation at night. Timely removal of field strains is destroyed outside the field. Ploughing the soil after harvest reduces the number of original bacteria and worms.
Scientifically prevent and control pests and reduce the damage of pests and diseases. 1 physical and chemical control. Usability attractants are used to trap the adults of the diamondback moth. When the trap is placed, the peripheral density is properly increased, and the density of the inner ring center is appropriately reduced. One set per acre is placed at a slightly higher position than the crop, and the greenhouse can be hung on the upper tuyere when used. Use yellow plates to smuggle locusts, whiteflies, etc., and hang 30-40 pieces per acre. Hang them on the upper part of the plant at 15-20 centimeters, and adjust the height as the crop grows. 2 chemical control. The diamondback moth can be controlled by spraying 10% of cyanopteranidiamide dispersible oil suspension 2000 times solution or 45% aconitine water dispersible granule 3000 times solution; 22% triflumacetamide can be selected during the initial stage of aphids Suspension 1500 times or 10% floxacillin water dispersible granules 1500 times and other spray control, focusing on plant leaves and the back of the leaf; Thrips can choose 60 g / l spinosad suspension agent 1500 times Liquid or 10% of cyanopteranidi dispersible oil suspension 2000 times liquid and other spray control; control of snails can be used Sijia aldehyde granules or 5% netafine granules 0.50 kg per mu stick or point in the plant near root Intercontinental table. Downy mildew can be controlled by 68% fine amazan Mn-Zn water dispersible granules 800 times solution or 18% carbazol sulfamate suspension 1500 times solution; Sclerotinia can choose 38% zorate hydrazide suspension agent 1000 times liquid or 50% procymidone wettable powder 1000 times liquid spray control, focus on spraying plant base and surface. In the seedling stage damping-off, blight can be selected 68% fine amazan manganese-zinc water dispersible granules or 80% mancozeb WP wettablet 600 times spray control. It is advisable to alternate the use of pesticides with different mechanisms of action. It is strictly forbidden to use (limited) pesticides and strictly observe safety intervals.
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