Insecticidal reduction of Potato leafroll virus transmission by Myzus persicae

Abstract

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.

Silício e imidacloprid na colonização de plantas por Myzus persicae e no desenvolvimento vegetativo de batata inglesa

“…A ausência de pulgões nas plantas, mesmo com a metade da dose do inseticida, pode ser devida ao efeito letal do imidacloprid (FOSTER et al, 2003) ou à sua ação como fagodeterrente, que afeta a movimentação e o comportamento alimentar de pulgões, particularmente em concentrações subletais (NAUEN, 1995;BOITEAU & OSBORN, 1997). Além do controle de M. persicae, a utilização de baixa dosagem de imidacloprid pode ser eficiente na prevenção de transmissão do PLRV (MOWRY & OPHUS, 2002;MOWRY, 2005).…”

Population genetic structure of Myzus persicae nicotianae (Hemiptera: Aphididae) in China by microsatellite analysis

“…This pest is distributed worldwide and accounts for a large percentage of plant economic losses (Blackman and Eastop, 2000). M. persicae nicotianae causes direct damage by feeding on plant sap and spreads a variety of secondary pathogens and plant viruses like other aphids, resulting in serious losses (Gray and Gildow, 2003;Mowry, 2005).…”

Development of Molecular Markers Closely Linked to the Potato Leafroll Virus Resistance Gene, Rlr etb , for use in Marker-Assisted Selection

“…Plants infected with PLRV during the growing season can produce tubers displaying tuber net necrosis, ranging from a slight reduction in crop value to complete crop loss. Control of net necrosis by growers involves the application of insecticides to control aphids that vector PLRV, with green peach aphid (Myzus persicae) being the most efficient and important aphid vector (Mowry 2005). Use of potato cultivars resistant to PLRV would contribute to sustainability in potato production by reducing insecticide applications during the growing season and by increasing potato seed quality through reduced PLRV infection.…”