Abstract:

The results generally demonstrated the dynamic of WBPH population in rice-tobacco intercropping treatments were lower than in rice monoculture systems, and the WBPH population was lower than control action threshold during heading and grain filling in rice in rice-tobacco intercropping systems. During the whole growing period of rice, Simpson index of spider guild was lower in rice-tobacco intercropping systems than in rice monoculture systems, while Shannon-Wiener index and Pielou index were higher. There was almost the same Simpson index, Shannon-Wiener index and Pielou index of parasitoid guild between the two systems. These findings suggest that tobacco habitats could potentially increase the efficiency of natural enemy and controlled WBPH population during heading and grain filling in rice.