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Journal of Biological Sciences

Year: 2003 | Volume: 3 | Issue: 2 | Page No.: 215-227
DOI: 10.3923/jbs.2003.215.227
Selective Toxicity of Different Granular Insecticides to the Peach-potato Aphid, Myzus persicae (Sulzer) (Homoptera: Aphididae) and its Parasitoid Aphidius matricariae Haliday (Hymenoptera; Aphidiidae) in two Differentially Resistant Potato Cultivars
A. U.R. Saljoqi and H.F. van Emden

Abstract: Field studies were conducted in Pakistan to examine the effects and the interaction of two differentially resistant potato cultivars i.e. Cardinal and Desiree (one partially resistant and one susceptible to Myzus persicae (Sulzer), respectively) with different dosage rates of granular insecticides, at different time intervals after application in relation to percent kill of M. persicae and effects on the parasitoid Aphidius matricariae Haliday (i.e. the third trophic level) within the aphid mummies, percent parasitism and Thimet 10G (phorate) was found about 30% more effective in reducing aphid population than the Furadan 3G (carbofuran). The highest doses of each insecticide caused maximum aphid mortality, in general aphid mortality appeared dose dependent. Mostly all the higher and lower doses of the tested insecticides were about 10% more effective on Cardinal than on Desiree. The most significant result was the synergistic interaction at the lower doses with plant resistance, so that the same level of control was recorded with the second highest dose on Cardinal as with the highest dose on Desiree. Also the same level of control was observed at the lowest dose on Cardinal as with the second last lowest dose on Desiree. Furadan 3G was found least toxic to the A. matricariae in terms of percent parasitism, emergence of parasitoids and number of mature eggs in the emerging females. Furadan 3G gave 13, 15 and 6% higher figures, respectively from the parasitoid characteristics than Thimet 10G. The highest doses of both insecticides were clearly toxic to the parasitoid. In general, the effects on the parasitoid were dose dependent. The second highest dose of Thimet 10G, gave the maximum yield.

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How to cite this article
A. U.R. Saljoqi and H.F. van Emden , 2003. Selective Toxicity of Different Granular Insecticides to the Peach-potato Aphid, Myzus persicae (Sulzer) (Homoptera: Aphididae) and its Parasitoid Aphidius matricariae Haliday (Hymenoptera; Aphidiidae) in two Differentially Resistant Potato Cultivars. Journal of Biological Sciences, 3: 215-227.

Keywords: Potato, myzus persicae, furadan 3G, thimet 10G, aphidius matricariae and selective toxicity

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