Abstract: In the Siping area of Jilin Province, six dominant locust species were bred under natural condition, and their spermarian development was studied. The results showed that at the beginning of adulthood, spermary had a ignificant increase of its length growth but no significant increase in its width growth. Thereafter, the spermarian volume got its peak, and then declined. The spermarian development of the locusts had an obvious species difference, with the development level at adulthood decreased in the order of Shirakiacris shirakii > Oedaleus infernalis > Omocestus viridulus > Euchorthippus unicolor > E. viisttatus > Atractomorpha heteroptera, and with the spermarian volume differed, indicating the differentia of the physiological functions of spermary among locust species. According to the histological observation, different types of cells were appeared in spermary at its different development stages. The growth of spermatocyte and the accumulation of matured sperm led to the increase of spermarian volume, while mating and physiological enervation resulted in the decrease of spermarian volume.

Key words: Wheat, Leaf emergence, Dynamic model