Effect of different spray amounts of plant protection drones on the control effect of the Chilo suppressalis
Plant protection drones with different spray amounts were used to control resistant Chilo suppressalis,and the control effect of it on the second and third generations of Chilo suppressalis were studied.The results showed that the spray amounts of the plant protection drone was positively correlated with the control effect of the Chilo suppressalis,and with the increase of the spray amounts,the seedling preservation effect and the insecticidal effect increased,and the best spray amount of 667 m2 was 4 L,followed by the spray amount of 3 L,and the spray amount of 2 L was poor.When the same agent,dosage and spray amount were used,the effect of the second-generation was significantly better than that of the third-generation Chilo suppressalis.After 667 m2 spraying with 4 L treatment,the seedling preservation effects of the second-generation Chilo suppressalis were 90.97%and 86.09%on the 15 and 20 days after treatment,respectively,and the seedling preservation effects of the third-generation Chilo suppressalis were 66.13%and 56.68%on the 15 and 20 days after treatment.Therefore,it is recommended that the spray amount of 667 m2 should exceed 4 L when using plant protection drones to control resistant Chilo suppressalis in late rice production period or high temperature season.
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