Clothianidin and Pymetrozine: Synergy on Planthoppers and Safety Analysis on Natural Enemies

doi:10.11923/j.issn.2095-4050.cjas18020006

Abstract

Abstract: To clarify the synergy of clothianidin and pymetrozine, and develop a new type compound pesticide to control rice planthoppers, we studied the control effect of the compound on rice planthoppers in field and its safety to natural enemies by indoor laboratory toxicity test and field test. Indoor toxicity test showed that: there were some synergies when clothianidin and pymetrozine were mixed at the ratio of 3:1, 2:1, 1:1, 1:2 and 1:3, the ratio of 1:2 had the best co-toxicity effect. Field test showed that: 30% clothianidin·pymetrozine SC had quickacting and long-lasting effects; when the dosage was 300-375 mL/hm2, the control effect on planthoppers was over 70% after 1 day, the quick-acting was better than that of pymetrozine; while after 35 days, the control effect on planthoppers was over 85%, the long-lasting effect was better than that of clothianidin and had no difference compared with pymetrozine. In addition, it had good control effect on both young and old nymphs. The 30% clothianidin ·pymetrozine SC is safe to spiders in paddy field and can be applied to rice production in large area.

束兆林. Clothianidin and Pymetrozine: Synergy on Planthoppers and Safety Analysis on Natural Enemies[J]. Journal of Agriculture, 2019, 9(2): 11-17.

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