Insect growth regulators: I biological activity of some IGR's against the susceptible and resistant strains of culex pipiens larvae II Pattern of cross resistance to IGR's in carbaryl-resistant strain

The biological activity and cross-resistance of some IGR's, Dimilin, BAY SIR 8514 and Chlorofluzuron, against susceptible and carbaryl- resistant of Culex pipiens were determined. The results indicated that these compounds are highly effective against the larvae of C. pipiens, but potent larvicides against the susceptible larvae than against the resistant ones. The pattern of cross-resistance to the used IGR's in the carbaryl-resistant strain were obtained. The data revealed none of these three IGR's as larvicides against the susceptible, and resistant to other potent IGR's was also studied