High-temperature and drought-prone vegetables and pests are prone to occur
Dynamics of pests: (1) Three generations of diamondback moth have three times the amount of the same period last year. In the investigation of five white radish fields, there were an average of 481 insects and 57 1-2 instar larvae per square foot, which was 2.8 times the level of the same period last year. The large-scale ecological potential of three generations of diamondback moth will cause serious damage to cabbage and cabbage vegetables. (2) The incidence of second-generation cabbage caterpillars was lower than that of the same period of last year. The second generation of adults migrated to cabbages and other vegetables in the vegetable area to produce oviposition hazards. (3) The occurrence of L. sativae was more important than the same period of last year. At present, it is mainly harmful to cucumbers, eggplants, tomatoes and other vegetables, destroying the photosynthesis of green leaves. As temperature rises, L. sativae will tend to moderately heavier. (4) Locusts are fierce in the near future. The scope of the harm is almost all related to the vegetables in the field, and the commerciality and output of the vegetables damaged by the aphids are declining. It also spreads the virus to cause the virus disease to occur, which constitutes a serious hazard to vegetables in fields.
Disease occurrence: (1) Solanaceous vegetable gray mold. At present, the "Three Solanum" field gray mold which adopts the flood irrigation method has occurred to varying degrees, resulting in whitening, soft rot, and severely reduced yield. (2) cucumber round spot leaf blight. The humidity in the shed is high, causing the disease to occur. (3) Solanaceous vegetables virus disease. High temperatures and droughts cause serious damage to the locusts, resulting in severe cucumber mosaic virus disease. Years of continuous cropping, low-lying land, lack of fertilizers or the application of unfamiliar organic fertilizers can exacerbate the harm of tobacco mosaic virus disease.
Control technology: control diamondback moth, cabbage caterpillar, aphid, spotted fly, use 2% avermectin EC (1000 times) mixed with 5% imidacloprid EC (1800 times), or 10 billion spores / ml of Bacterium Suspending agent (800 times solution) mixed with 10% imidacloprid EC (3000 times solution), or 16,000 IU/mg of Bacillus thuringiensis wettable powder (1000 times solution) and 25% cypermethrin EC (2500 times solution) and 5% imidacloprid Emulsion (2000 times) spray. Each medication was given on May 14 and May 20-24. Prevention and treatment of diseases should first change the irrigation method. Bright irrigation and flood irrigation will provide favorable conditions for the development and spread of spores. The adoption of furrow irrigation can prevent excessive surface moisture and is not conducive to the propagation and spread of pests. Controlling Botrytis cinerea, can use 50% procymidone wettable powder 800-1000 times, or 50% isoprenil wettable powder 1000 times, or 75% chlorothalonil wettable powder 500-600 times, every other 7-10 times, continuous control 2-3 times. Control cucumber leaf blight, available Dasheng M-45 80% mancozeb WP wettable powder 600-700 times or Dakkon 40% chlorothalonil suspension 700-800 times, or 70% methyl sulfide Diosperm wettable powder 1000 times spray, once every 7-10 days, continuous control 2-3 times. Control solanaceous vegetables virus disease, available virus A20% do èƒ copper acetate wettable powder 400-600 times liquid, or per acre with phytosanitary spirit 1.5% alkanol sulfate copper water emulsion 60-120 ml water spray, every 7 Once a day. Continuous control 3-4 times. Before and after the colonization of pepper, with 83% of the anti-agent 10% mixed fatty acid aqueous emulsion 600-1000 ml water spray, once every 7 days, continuous control 3-4 times, can prevent disease, promote premature and increase production.
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