Monitoring of organophosphate and carbamate resistance and identifying a combination of insecticides showing negatively correlated cross resistance in the green rice leafhopper (Nephotettix cincticeps Uhler) (Hemiptera : Deltocephalidae)

Abstract

Development of organophosphate and carbamate resistance was monitored by assaying the acetyl-cholinesterase (AChE) phenotype of individual green rice leafhoppers (Nephotettix cincticeps Uhler) of five strains which showed different levels of resistance to N-methyl carbamates. By applying this method to screening of various combinations of negatively correlated inhibitors, we observed that monocrotophos was negatively correlated to N-methyl carbamates in potency of AChE inhibition.