The combined use of mineral oils and pyrethroids to control plant viruses transmitted non- and semi-persistently by Myzus persicae |
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Authors: | R W GIBSON A D RICE |
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Institution: | Rothamsted Experimental Station, Harpenden, Herts. AL5 2JQ |
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Abstract: | A mixture of the pyrethroid WL85871 (an enriched form of cypermethrin) and the mineral oil SC811 intoxicated adult apterae of an insecticide-susceptible clone of the peach-potato aphid Myzus persicae at a similar rate to a treatment containing only WL85871, but the mixture killed more. Mixtures of WL85871 andSC811 also gave better control of both acquisition and inoculation by M. persicae of the non-persistent potato virus Y (PVY) than either component alone. A mixture of the pyrethroids deltamethrin, cypermethrin and PP321 with SC811, or a mixture of WL85871 with the mineral oil Bayol 52 also decreased acquisition of PVY, and a mixture of WL85871 with SC811 decreased acquisition of another non-persistently transmitted virus, beet mosaic virus. Control with mixtures was generally better than that provided by each component applied separately. When testing acquisition or inoculation of the semi-persistent beet yellows virus, fewest plants were infected in treatments incorporating both WL85871 and SC811. |
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