Hummer should pay close attention to the timing of the prevention and treatment of the land where the population of plague horses whose larvae reach more than one hundred locusts and where the symptoms are infested. The use of 15% Aldoea 1200 times, or 45% Cypermethrin Emulsion 1500 times, or biological pesticide Zhongnong No. 1 water agent 800 times 3 pesticides can achieve a 95% control effect at a time, and the effective period can reach up to 1 month. Should pay attention to the alternate use of pesticides, it is strictly prohibited to use the same pesticide continuously in the same plot, especially beta-cypermethrin is easy to produce pest resistance. In the mid-June, in mid-July, the locust-infested seed base and the land that cannot be cut off in time were treated with 25% imidacloprid WP, ​​1500 times 25% Pyro-emulsion 2000 times, or biological pesticide BTA 1000 times for prevention and control. effect. Once it is discovered that new seeds are found on elephant weeds, they can be treated with poisonous soil immediately. They can use chlorpyrifos 800 times or phoxim 500 times in the afternoon to spread their soil around the roots. Grassland larvae found 1 to 2 larvae per square metre, or a large number of adult worms 7 days to 10 days after the chemical control. The low-toxicity chemical agents 15% arsonopic oil 1200 times, 4.5% beta cypermethrin 1500 times or Bio-pesticide Zhongnong No. 1 water agent 800 times, 0.3% oxymatrine No. 3 water agent 800 times, control effect can reach 100%. The leaf miner should choose high-efficiency and low-toxicity systemic insecticides such as avermectin series, which can be sprayed and sprayed with 2000 times liquids such as spot latent nets and acetylephrine. Downy mildew should follow the principle of “prevention of weight and treatment†for diseases. For plots that cannot be cut ahead of time or in time, it is recommended to use metalaxyl, netophylum net, and poisonous locust 600 to 800 times in the middle and late May. 1 to 2 times. The brown spot is selected and disinfected by seeds. The Bordeaux mixture and the lime-sulfur yellow mixture can be used for control.
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