Resistance Pattern in Four Strains of Insecticide-Resistant Green Rice Leafhopper, <i>Nephotettix cincticeps</i> UHLER, Collected in Fields

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  • OZAKI Kozaburo
    Division of Phytopathology and Entomology, Kagawa Agricaltural Experiment Station
  • KUROSU Yasuhisa
    Central Research Laboratory, Hodogaya Chemical Industry Co. Ltd.

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  • ツマグロヨコバイにおける殺虫剤抵抗性
  • ツマグロヨコバイ ニ オケル サッチュウザイ テイコウセイ

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Abstract

One susceptible and four resistant strains of green rice leafhopper were collected in the summer and autumn in 1963. Median lethal doses of 17 insecticides to these four resistant strains were compared with those of the susceptible strain. Ratios of LD50 values between each resistant strain and susceptible one were calculated with various insecticides. There were many insecticides whose ratio of resistance exceeded 5.0. This inclination was commonly found in organophosphorus compounds with one exception. Total amounts of chemicals which were applied to paddy fields in the areas where testing strains were collected during past several years were surveyed. In Osone district where malathion had been used heavily, the leafhoppers were resistant to malathion and papthion, while, in Nakagawahara where methyl parathion and EPN had been used abundantly, leafhoppers were resistant to many organophosphorus insecticides such as methyl parathion, parathion, EPN, Sumithion, malathion, dimethoate and papthion. Considering resistant ratio of four resistant strains to susceptible one in various organophosphorus insecticides, these types of resistance were divided into three patterns; namely: (1) malathion-resistance, (2) malathion-, methyl parathion-resistance, and (3) methyl parathion-, EPN-resistance. These resistant strains were as nearly susceptible to dipterex, sulioxon, Sevin, CPMC, and Baygon as susceptible strain.

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