Brassica napus control methods
Aphids are one of the common pests and diseases of rapeseed. The aphids that are harmful to rape are mainly carrot and aphid. Both of these two species of locusts had intensive sap on the backs, cabbages, stems, and floral axes of the two locusts, destroying the leaf and chlorophyll, causing leaf curling and shrinking, and the leaves of the seedlings were affected by curling and yellowing; the plants were dwarfed. Slow growth, severe leaves dead. After the bolting of rapeseed, more concentrated damage to the lettuce, the formation of "cokes wax stick", affecting the flowering and scab, and the tender head and coke.
Nearly 20 generations of peach aphid occurred in one year, and nearly 30 generations of radish sprout occurred in a year. Both locusts occur in field rape in winter. The peak period is generally in the middle of October-November. Therefore, the sooner the rapeseed is sown, the more locusts that fly from other cross-breeding crops, the heavier the damage. The locusts are clustered and the rape planting density is too large for optimum propagation. Radish pods have a wider temperature range than those of peach pods. In the autumn, radish sprouts are mostly on oilseed rape, but most of them are peach pods in spring. The dry weather in autumn and spring can often cause a large number of aphids to occur. On the contrary, there are many damp and wet weather, the reproduction of aphids is inhibited, and the damage is lighter.
Control methods: Prevention and control of rape aphids, should be based on chemical control can be used mainly acetamiprid, pymetrozine, nitenpyram, butyl sulfide carbofuran, thiamethoxam, thiacloprid, deltamethrin, anti-resistant Wei Other drugs. The application should seize three periods: the first is the seedling stage (3 true leaves); the second stage is the initial stage of budding; in the third stage, more than half of the rapeseed plants are bolted to a height of about 10 cm. However, these three periods also depend on how many locusts determine the amount of pesticide application.
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