Sensitivity levels of green leafhopper (GLH) populations to insecticides at IRRI [Philippines] in 1983-84
1985
Fabellar, L.T. | Mochida, O. (International Rice Research Inst., Los Banos, Laguna (Philippines))
Green leafhoppers (GLH) at IRRI were suspected to be becoming less sensitive or resistant to insecticides because of frequent application. Insecticide sensitivity of F2 GLH populations was compared to that of a greenhouse culture that had not been exposed to insecticide treatments. A Burkard microapplicator was used to apply 0.2 microliter each of 5 insecticides, diluted by acetone, on CO2 anaesthesized 2- to 5-d-old GLH adults. The LD50 values of the greenhouse population ranged from 0.99 to 8.23; that of field-collected GLH was from 2.40 to 26.47. The estimated resistance ratio was from 1.47 to 3.22. This indicates the field-collected GLH may be developing resistance to the tested insecticides. Only the diazinon-treated field-collected population was significantly more resistant than the greenhouse culture
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