Effects of Neem-Based Formulations on Brown Planthopper Nilaparvata lugens (Ståhl) and Whitebacked Planthopper Sogatella furcifera (Horvath)

Abstract

Toxicological and biochemical effects of azadirachtin and neem oil on both sexes of two planthopper species of rice N. lugens and S. furcifera were evaluated. 

Results showed that with increasing concentrations of neem oil and azadirachtin higher mortality was observed to both sexes of the two planthopper species. Lesser mortality was observed in females than males which was attributed to size differences. Esterase activities were also found affected in treated insects although there existed variations in responses between the spe- cies tested.