【摘要】 为了解梨树草履蚧的种群动态,抓住其生长发育的薄弱环节和适宜防治时期,以邯郸魏县梨树上的草履蚧为调查对象,以树干基部为起点,对距树干不同距离、不同深度土壤中草履蚧卵的地下空间分布以及不同龄期草履蚧若虫地上空间分布规律进行调查。结果表明:草履蚧以越冬卵的形式在地表落叶下呈聚集状分布,在0~5cm土层卵数较多;同一土层,距树主干33cm处卵数最多;地上部分,草履蚧若虫呈聚集状分布。1龄若虫有上趋性,聚集在树枝顶端;2龄若虫和雌成虫混合发生,集中分布在直径约1.5~2.0cm枝条的中、下部。更多还原

【Abstract】 To explore the population dynamics in pear trees,grasp the weak link of growth and development and optimum control period of D.corpulenta,by concerning on D.corpulentain pear trees from Weixian,Handan City,taking the basic parts of trunks as a starting point,the authors investigated the underground distributions according to the distances between D.corpulenta eggs and tree trunks and aboveground distributions of nymphs in different instars.Results:Overwintering eggs of D.corpulenta gathered on shed leaves and the number of them in the soil layer 0~5cm was large.Moreover,the number of eggs 33 cm away from the trunks was the largest in the same layer.The aboveground nymphs showed aggregated distribution as well.1st instars showed their tropism of climbing upward and they gathered on the top of branches,while 2ndinstars and female adults mixed and concentrated on the middle and lower parts of branches which were 1.5~2.0cm in diameter.更多还原