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Topical LDso values for eight insecticides were determined in five populations of the small brown planthepper, Laodeiphax striatellzas FALLEN, (SBH), collected in fields in districts of Kyushu and on the East China Sea in 1980. No significant local variabilities in LDso values were observed with the SBPH collected from the fbur localities in Kyushu but they showed the most remarkable increase ofresistance ratios to malathion. The tested population had developed 90to 270-fold resistance as compared with the Chikugo population tested in 1967, and also showed 20to 70-fold resistance to fenitrothion, diazinon, MTMC, carbaryl and MIPC, The SBPH population collected on the East China Sea gave LDso values coincident with these four pepulations.

applied entomology and zoology

Insecticide Resistance of the Small Brown Planthopper, Laodelphax striatellus FALLEN (Hemiptera : Delphacidae), Collected in Kyushu and on the East China Sea