Rape field to prevent and control aphids, can reduce the incidence of sclerotia, downy mildew, virus disease. The locust harm is almost accompanied by the entire fertility process of rape, and it is necessary to grasp the following key reproductive periods.
Early seedling stage seedling transplanting seedling rapeseed stage and live rape rape before the 5 leaf stage, the leaves are green, can easily lead to aphid damage, available 40% omethoate 1000 times or 2.5% deltamethrin 2500 ~ 3000 times liquid Prevention. In the dry conditions in the late autumn and early winter, it should be controlled. Pay attention to the spray on the back of the locus where the leaves reside.
During the overwintering period, the wingless pupas of radish pods are controlled, the larvae lurking inside the leaves of the rapeseed, and the peach peony larvae hiding on the back of the leaves that are close to the ground. These are the basis for the damage of the locusts after the spring. Can be used before and after the opening of rapeseed, 40% omethoate 50 to 100 ml per mu, imidacloprid wettable powder 10 to 15 g water 50 to 75 kg spray zero prevention, or 2.5% per acre with 20 ml of olfluthrin plus 40 % 50 ml of omethoate and 50 to 75 kg of water sprayed.
During the convulsions stage, the aphids in the convulsion stage of rapeseed began to damage from the buds of the main branch, gradually threatening the buds, pedicels and pods of other branches. It can be sprayed with 40% omethoate 1000-2000 times in the beginning of the convulsions.
Re-treatment of flowering nodes at flowering stage Most of the locusts clustered on flower buds, pedicels, pods, leaves and branches and sucked juice, which resulted in withering of rape leaves, unsatisfactory flowering angle and unsatisfactory pods, which had a great influence on rapeseed yield. Control should be started at the beginning of the locust damage period to suppress its outbreak and spread. Generally, it uses 2.5% deltamethrin 20-30 ml per mu or 40% speed to kill 60 ml of emulsifiable concentrate and add 40-60 kg of water to the spray.
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