Effects of Nicotine and Rutin on the Susceptibility of Spodoptera litura to Insecticides and the Activities of Some Enzymes

The susceptibilities of the 3th instar larvae of Spodoptera litura fed on diets treated with nicotine and rutin to AucaNPV,fipronil and spinosad were studied. The activities of CarE and GSTs in different treated cutworms were also tested.The results showed that the nicotine enhanced significantly the susceptibility of Spodoptera litura to insecticides,and the susceptibility enhanced as the nicotine concentration in the diets increased.Low concentration rutin in the diets increased the susceptibility of Spodoptera litura to insecticide,but the susceptibility decreased as the concentration increased.The two alleochemicals restrained the activities of CarE in different degrees,however,they induced the activities of GSTs.