吉林省玉米螟的化性类型与其主要特性的关系

针对吉林省东部、西部地区的亚洲玉米螟一化性和二化类型种群,研究玉米螟滞育与饲养温度的关系、自交后代和杂交F1代的滞育后发育历期及在不同生态区的一代化蛹率。研究表明:人工累代饲养的两种化性类型玉米螟发育历期比较一致,但降低饲养温度后,滞育率则表现出明显不同,一化性类型玉米螟滞育率显著高于二化性类型。两种类型玉米螟人工饲养的后代,经诱导滞育后仍然存在滞育后发育历期上的差异,与其越冬代所具有的滞育后发育历期特性相似。两种类型玉米螟杂交F1代滞育后发育历期特性的表现因双亲在杂交组合中的相互关系而异,正交与反交组合F1代的滞育后发育历期差异显著。在吉林省东部、中部、西部3个生态区内,虽然相同类型玉米螟的化蛹率有较大区别,但在同一生态区内两种类型玉米螟的化蛹率仍具有显著差异,二化性类型玉米螟的化蛹率明显高于一化性类型。

The Relationship Between Voltinism Types and Main Characters of Asian Corn Borer in Jilin Province

The relation between diapause and the rearing temperature, the post-diapause development duration of the inbred progeny and hybrid F₁, and the pupation rate of the first generation in different ecological areas on the univoltinism types in the east and bivoltinism types in the west of Asian corn borer in Jilin province had been studied. Research result testified that development periods of the two voltinism types reared continuously were consistent, but the diapause rate was significant different after the rearing temperature reduced, and the diapause rate of univoltinism types were higher than of the bivoltinisms. Rearing progeny induced diapause of two voltinism types were still different in post-diapause development duration, the characteristic differences were similar to their overwintering generation. Differences of post-diapause development duration of hybrid F₁ progenies between two voltinism types depended upon the parent interrelation in hybridization combination, differences of the post-diapause development duration were significant between hybrid F₁ progenies of the positive and negative cross combination. Though there were differences in the pupation rate of the same voltinism types in three ecological areas of the east, central and west in Jilin province, there were remarkable differences in the pupation rate of two voltinism types in the same ecological area, and the pupation rate of the bivoltinism types was higher than of the univoltinism types.