Population densities of Encarsia formosa and Bemisia tabaci.

Census data were initially subjected to a one-way ANOVA with agriculture landscape types as the main effect. To reduce the impact of occurrence time on the population densities of E. formosa and B. tabaci, the activity period of E. formosa and B. tabaci densities were divided into early, main and late activity period by quartile method. Differences in E. formosa and B. tabaci densities and parasitism rate were compared among agriculture landscape types in the same activity period by Least Significant Difference. The significance threshold was P = 0.05 in all tests. Data analyses were performed using SPSS 20.0. (XLSX)