Physical control: yellow plate trapping kill aphids, whitefly. With 6040 cm rectangular cardboard, painted with yellow paint, and then coated with a layer of engine oil, hung in the field, 30-40 pieces per acre, when the yellow board full of insects such as aphids, whitefly and other pests, and then coated with a layer of engine oil. Hanging silver-gray plastic film to repel aphids. Chemical control: The dust protection method and the smoking method are preferred for the protected areas. In dry and sunny weather can also spray control, pay attention to rotation drugs, a reasonable mix. Downy mildew: 1? Uses 45% chlorothalonil smoke agent 110-180 grams per mu and closes smoke in the evening. Smoked once every 7 days, even smoked 3-4 times. 2? After finding the central strain, use 40% aluminum phosphate wettable powder 150-200 times, or 72.2% Preclosure 600-800 times, or 75% chlorothalonil wettable powder 500 times spray, alternating , rotation use, 7-10 days 1, even spray 2-3 times. Black spot: At the beginning of the disease, use 75% chlorothalonil wettable powder 500-600 times, or 50% acetaminophen wettable powder 1500 times, 7-10 days, spray 2-3 times. Black rot: At the beginning of the disease, use 14% solution of ammonia-copper water solution 600 times, or 77% to kill WP 1500 times, or 72% of agricultural streptomycin sulfate powder 4000 times, once every 7-10 days. , spray 2-3 times. Botrytis cinerea: 1? In the early stage of disease, use 10% quick-cylinder smoke agent 200-250 grams per mu, or spray 6.5% methadone ultrafine dust agent or 5% Garinong dust agent 1 kg per mu. 2? After the onset of the disease, use 50% Suo Ke Ling WP 2000 times, or 50% Propionine WP 1000-1500 times, or 40% polysulfide suspension 600 times spray, every 7-10 days spray Once, spray 2-3 times. Black shank disease: At the beginning of the disease, use 60% Duofu WP 600 times, or 40% polysulfide suspension 500-600 times, or 70% chlorothalonil WP 600 times, spray every 9 days 1 Times, 1-2 times. Pieris rapae: 1? Use 200 times Bt emulsion in the hatching period of eggs, or 5% chlorhexidine cream 2500 times spray. 2? Before the 2nd instar larvae use 2.5% Kung Fu EC 5000 times solution, or 10% Uranus EC 1000 times, or 50% phoxim EC 1000X solution. Plutella xylostella : Egg hatching period with 5% Ruijinte suspension agent 17-34 ml per mu, add water 50-75 liters, or 5% thioglycoll EC 2000 times, or 2.8% avermectin before 2nd instar larvae Emulsion 3000 times, or Bt emulsion 200 times spray. The above medicines should be rotated and used interchangeably. Never use a single pesticide for continuous use. Locust: Use 50% Pipa wet WP 2000-3000 times, or 10% imidacloprid wettable powder 1500 times, spray once every 6-7 days, spray 2-3 times. Appropriate amount of spreading agent can be added when using medicine. Spodoptera exigua: Egg incubation hatching period with 5% Sulfochlor EC 2500-3000 times, or larvae before the 3rd age with 52.25% farmland EC 1000 times spray, sunny evening medication, cloudy day can be medication.
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