RELATIONS OF SEASONAL PREVALENCES OF FOUR SPECIES OF PLANTHOPPERS AND LEAFHOPPERS DETERMINED BY LIGHT TRAP TO THEIR SEASONAL ABUNDANCES IN A RICE FIELD

Abstract

Four species, the brown planthopper, the white back planthopper, the small brown planthopper, and the green rice leafhopper, were caught in light trap, while their seasonal abundances in a rice field near the light trap site (Fig. 1) were surveyed using sticky trap and suction catcher during the rice-cultivating season in 1960 and 1961. The seasonal prevalences determined by three methods (Fig. 2) were compared with one another only in macropterous adults of each species by means of the correlation method (Table 1). The prevalences determined by sticky trap were similar to those determined by suction catcher in each species except the brown planthopper. In cases of the brown planthopper and the white back planthopper, the prevalences determined by light trap were different from those determined by sticky trap and suction catcher. In cases of the small brown planthopper and the green rice leafhopper, however, the prevalences determined by light trap were somewhat similar to those determined by sticky trap and suction catcher.