S. Avenae population was a mixed population which was consisted of three parts: different insect states (larva instars) , different wing forms and different body colon. The green wing aphid was the main body of the S. Avenae population in the wheat jointing-booting stages and milk maturity. The green wingless aphid was the main body of the S. Avenae population in the flowering-filling stages. There was significant difference between resistance and susceptible wheat varieties in S. Avenae population size and population structure. The aphid population size was lower on the resistant wheat variety than on the susceptible wheat variety. In the filling stage, the percentage of wingless aphid was lower on the resistant wheat variety than on the susceptible wheat variety. Red aphids prefer to feed susceptible wheat variety. The results showed that there were significant effects of host's growth stages and varieties on the S. Avenae population structure.%在小麦拔节到乳熟期内,麦长管蚜自然种群是以不同虫龄、不同翅型和不同体色蚜虫组成的混合群体.小麦拔节-孕穗和乳熟期以绿色有翅蚜为主,扬花-灌浆期以绿色无翅蚜为主.抗感两小麦品种上麦长管蚜自然种群在数量、翅型、虫龄和体色组成等方面差异显著.抗蚜品种上麦蚜种群数量显著低于感蚜品种；小麦灌浆期,抗蚜品种上成蚜比例和无翅蚜比例均显著低于感蚜品种.蚜虫自然种群体色结构分析表明,红体色麦长管蚜更喜取食感蚜小麦品种.结果表明,寄主生育期和寄主品种显著影响麦长管蚜种群结构.
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