Abstract: To understand geographic variation in body weight and body size in the Asian corn borer, Ostrinia furnacalis Guenée, we compared the body weight and body size of the Asian corn borer, O. furnacalis from four different latitudes: Ledong, Hainan (18.8°N, 109.2°E); Yangshuo, Guangxi (24.8°N, 110.5°E); Nanchang, Jiangxi (28.8°N, 115.9°E); Langfang, Hebei (39.5°N, 116.7°E). And then the relationship between body weight, body size and latitude was analyzed. The results indicated that egg weight of the Asian corn borer gradually increased with an increase in latitude that followed Bergmann’s law, whereas the pupal weight, body length, hind femur length and fore wing length for both female and male gradually decreased with an increase in latitude that followed Converse Bergmann’s law. Fore wing length of the female is significantly longer than that of the male in the four geographic populations and the sexual size dimorphism followed the Rensch’s rule, with the increment of the fore wing length of males relatively larger compared to that of females in populations with large body size. These results further suggest that the geographic variation in body weight and size may be different in different stage in the same species of insects

Key words: Ostrinia furnacalis, geographic variation, body weight, body size, sexual size dimorphism