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作 者:阎浚杰[1] 黄大庄[1] 王志刚[1] 纪殿荣 阎晔辉[1]
机构地区:[1]河北林学院
出 处:《河北林果研究》1994年第S1期63-70,共8页Hebei Journal of Forestry and Orchard Research
摘 要:北方桑天牛雌虫经初期交尾,可终生产孵化卵,具有单雌远距离传播的危险性;幼虫存在夏季间歇活动期和日活动节律。据此确定了最佳用药时期。居民区自然种群趋势指数(1)比林地高3.74倍;计算出了平均世代长;确定了幼虫聚集分布的空间格局等。Once the femal adults of Apriona germari were mated in early stage,they could layhatchable eggs latter on. This causes the danger of long dissemination of the pest by femaladults.For its larvae,intermittent boring period in summer, and daily boring patterns wereobserved.Therefore,the best time for its control with pesticide was selected.The tendencyindex of natural population in residential areas was 3.74 times higher than that in forest.Meanwhile, the average generation span was calculated,and space pattern of crowding dis-tribution of the pest was given.
分 类 号:S888.729[农业科学—特种经济动物饲养]
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