In the middle and late October, the major pests and diseases of vegetable fields are leafminer, yellow striped triceratops, Spodoptera litura, and downy mildew. Production should pay close attention and timely inspection.
Trends occur (1) Leaf miners. Autumn is the season of high incidence of leaf miner, which mainly damages leafy vegetables, especially Chinese cabbage and spinach. With the increase in the amount of vegetable growth, the trapping power of the leaf miner is increased. It is expected that the damage degree will increase in the middle and late October and a large number of insect pathways will appear. (2) Yellow striped jumps. October is the main damage period of the yellow stripe jump. According to the survey on October 8, the average number of adult cabbages in 3 fields of 3 cabbages is 36.6, and the average of 100 adults in 3 fields of Chinese cabbage is 3.3. (3) Nocturnal insect pests. The insects of the moths on Spodoptera litura in autumn this year are mainly Spodoptera litura. It is expected that the fifth generation egg hatching peaks will appear on October 20-25, and the degree of occurrence will be moderate or light. (4) Downy mildew. It is easy to attack under low temperature and rainy conditions.
Control advice (1) Leaf leaf fly. For leafy vegetable fields where a feeding hole or a small amount of insect paths have appeared on the plants, 50% ciprofloxacin wettable powder should be sprayed with 1000 times immediately, and the control should be performed after 7 to 10 days. (2) Spodoptera litura. Use Sucral S. nucleatum (containing 16,000 IU/mg of Bacillus thuringiensis, 10,000/mg of Spodoptera exigua nuclear polyhedrosis virus) per acre at the peak stage of young instar larvae or 2.5% of emamectin benzoate 30 ml of salt emulsifiable concentrate or 50 ml of 10% chlorfenapyr suspension is added, and 50 kg of water is added to spray, which can also treat cabbage caterpillars, diamondback moths, etc., and the insect pests can be controlled once every 7 days. (3) Yellow striped jumps. When the number of insects in one hundred strains reaches 3 to 5, use 12 to 15 ml of Alibaba high-chlorofluorocarbon microcapsule suspension agent per acre to add 50 kg of water to the spray. (4) Downy mildew. After rain is fine or when there are continuous 2 to 3 days of haze fog weather, 72% of frost-urea manganese zinc WP or 80% of Manson Mn wettable powder or 58% of nail MnZn may be wetted per gram. 100 grams of powder, add 50 kilograms of water spray, and prevent it once every 7-10 days. For a small number of already affected fields, medication should be taken immediately and the disease should be administered again in the middle or late October.
In addition, solanaceous vegetables should continue to promote the method of matrix seedlings and postponed the sowing date, control the adult whitefly insects to migrate to spawning, to prevent transmission of virus-induced virus disease. It was found that adults of B. tabaci should be treated with pesticides in time. They can use 52.25% of chlorpyrifos-chlorpyrifos emulsion 50ml plus 5% of acetamiprid EC 50ml or 10% of Amylo 70% imidacloprid water-dispersible granules per acre. Kilogram spray.
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