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Insecticidal reduction of Potato leafroll virus transmission by Myzus persicae
Author(s) -
MOWRY THOMAS M
Publication year - 2005
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.2005.03149.x
Subject(s) - biology , thiamethoxam , potato leafroll virus , myzus persicae , imidacloprid , oxamyl , methamidophos , agronomy , plant virus , virology , virus , pesticide , aphid
Summary Esfenvalerate, imidacloprid, methamidophos, oxamyl, pymetrozine and thiamethoxam were tested for their potential to reduce the transmission of Potato leafroll virus (PLRV) by Myzus persicae. In acquisition experiments exposing virus‐free aphids to insecticide residues on virus source plants during a 2‐day acquisition access period, subsequent transmission of PLRV to untreated indicator plants declined significantly with increasing dosage for all insecticides. At the highest dosages, PLRV transmission was reduced by 28%, 100%, 31%, 10%, 87%, and 99.8% for the six insecticides, respectively. In inoculation experiments exposing viruliferous aphids to insecticide residues on treated indicator plants during a 5‐day inoculation access period, PLRV transmission again declined with increasing dosage. At the highest dosages, transmission was reduced by 71%, 56%, 16%, 40%, 94%, and 38%, respectively. Methamidophos and oxamyl were very good aphicides, but were relatively ineffective in reducing virus transmission. Reduction of PLRV transmission by imidacloprid and thiamethoxam appeared to be largely related to their toxic effects, but it is likely that antifeedant properties also played a role, especially in the inoculation experiments. Pymetrozine reduced PLRV transmission in both types of experiments, but especially so in the inoculation experiment, possibly reflecting its antifeedant properties.