Indian Journal of Plant Protection

Sugar ester fractions from Nicotiana gossei, N. trigonophylla, N. repanda, N. benthamiana, N. glutinosa and N. plumbaginifolia were evaluated against tobacco aphid, Myzus nicotianae and the bud worm Helicoverpa armigera. Crude sugar ester fractions from N. gossei and N. trigonophylla caused significant mortality of the tobacco aphid at all concentrations tested followed by the extracts from N. glutinosa. The highest mortality (90%) was recorded in case of 2% crude sugar esters from N. trigonophylla. The crude sugar ester fraction from N. gossei appeared to have growth regulatory properties against the larvae of H. armigera when incorporated into artificial diet at concentration of 2.5 mgl g of diet though they did not exhibit significant toxicity. Highest oviposition deterrence (oviposition index 0.13) was recorded with the dichloromethane fraction of N. trigonophylla at 0.5% concentration followed by the same fraction at 0.25% concentration, dichloromethane fraction of N. gossei at 0.5% and 0.25% concentrations.