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Field Efficacy Trials of 25% Pymetrozine SC against Brown Rice Planthopper in Field

Zhang Yin-gui

Abstract

When the brown rice planthopper density was 6 000～10 000 insects/100 holes,the activity of 25%pymetrozine SC was tested on brown rice planthoppers in field.The results showed that the control effect of 3 d,7 d at 24 g/667 m~2 were 73.69% and 64.92%,respectively.And the control effect of 3 d,7 d at 30 g/667 m~2 were 78.55%and 70.19%,respectively.It was better than ethiprole and nitenpyram.It was recommended that 25%pymetrozine SC be sprayed again after 15～20 d.

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Key concepts: Brown planthopper, Planthopper, Brown rice, Toxicology, Paddy field, Horticulture, Biology, Agronomy