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The Evaluation and Screening of Pesticides for Controlling Myzus Persicae (Sulzer)

Author: LinWeiJie
Tutor: GongDaoXin;GuGang
School: Hunan Agricultural University
Course: Crop Science
Keywords: Myzus persicae pesticide mixture field experiment control effect
CLC: S435.72
Type: Master's thesis
Year: 2009
Downloads: 11
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Abstract


In this paper, the resistance of tobacco aphid to six kinds of insecticide and the field experiments of pesticides on Myzus persicae were studied, meanwhile virulence indoor tests of different kinds of insecticide mixtures and field experiments also were down in Sanming of Fujian province. As follows:1、The sensitivity of tobacco aphid to six kinds of pesticide was determined with soakage method.The result indicated that LC50 of acetamiprid was minimum (4.4624mg/kg); secondly imidacloprid(45.0667mg/kg); fenvalerate and methomyl was 64.3165mg/kg and 66.3914mg/kg respectively;phoxim was higher(126.0371mg/kg); cyhalothrin was the most(153.3693mg/kg).2、Field experiments of six common kinds of pesticide which indicated that 10% iambda-cyhalothrin and 20% fenvalerate were fast-available but durable effect were opposite, the effects decreased significantly 7d and 1Od after pesticide application; phoxim was general;then 20% methomyl,20% imidacloprid and 3% acetamiprid were not obvious but durable effects were opposite,control effects respectively were 86.75%、93.29%、86.23%、91.27%.99.61% and 93.85% 7d and 1Od after pesticide application.3.CTC test was carried out through mixing fenvalerate with other pesticides, which indicated that fenvalerate+phoxim (3:2) was maximum(825.9632);secondly fenvalerate+ phoxim(1:1)was 462.4539;fenvalerate+phoxim(1:1)was minimum (244.6190).CTC of fenvalerate+methomyl(1:1)was maximum (367.0912);secondly fenvalerate+ methomyl (3:2) was 297.0816; fenvalerate+methomyl (2:3) was minimum(157.3237). CTC of fenvalerate+imidacloprid (2:3)was maximum(1558.2829);secondly fenvalerate +methomyl (3:2) was 603.0098;fenvalerate+methomyl(1:1)was minimum(326.1280). All above had significantly synergism.4.Field experiments indicated that control effect of fenvalerate+phoxim mixture, fenvalerate+methomyl,imidacloprid+fenvalerate was in agreement with the CTC. Integrated efficacy was better than the single chemicals.

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CLC: > Agricultural Sciences > Plant Protection > Pest and Disease Control > Crop pests and diseases and their prevention > Economic crop pests and diseases > Tobacco pests and diseases
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