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紫薇梨象(Pseudorobitis gibbusRedtenbacher)是一种危害紫薇的重要害虫,近年来在安徽等地发生严重。笔者对其生活史与危害特性进行了观测分析。结果表明,紫薇梨象在安徽省安庆地区1年1代,以成虫(43.9%)和老熟幼虫(56.1%)越冬。越冬成虫翌年4月中旬出果上树为害;越冬幼虫4月上旬化蛹、6月中旬羽化成虫上树取食为害。紫薇梨象对紫薇危害部位较广(嫩梢、花芽、花蕾、蒴果等),其中以嫩梢和蒴果受害最为严重。不同紫薇品系的被害率分析表明,紫薇梨象对翠薇和银薇的危害性要明显高于南紫薇。研究证实,紫薇蒴果是紫薇梨象越冬场所,清除蒴果是防除该虫的行之有效的主要措施。因此,在紫薇梨象越冬前(9月上、中旬)对紫薇果枝进行修剪能够显著降低紫薇梨象的危害。
Pseudorobitis gibbus Reddishbacher is an important pest that endangers Lagerstroemia speciosa. In recent years, it has become serious in Anhui and other places. The author made an observation and analysis of his life history and harmful characteristics. The results showed that the crape myrtle pear in the Anqing area of Anhui Province 1 year a generation, with adult (43.9%) and mature larvae (56.1%) winter. Overwintering adults in mid-April the next year the fruit tree damage; overwintering larvae in early April pupation, mid-June emergence of adult tree feeding damage. Ziwei pear like the crape myrtle damage than the broader (tender shoots, flower buds, buds, capsules, etc.), of which the shoots and capsules most severely affected. The analysis of the damage rate of different crape myrtle strains showed that the crape myrtle pests like the crape myrtle and the Yin Wei is more harmful than the southern crape myrtle. Studies have confirmed that crape myrtle capsule is overwintering crape myrtle, clearing the capsule is the main effective measures to control the pest. Therefore, crape myrtle pear overwintering (mid-September, mid) on the crape myrtle fruiting branches can significantly reduce the crape myrtle pear icon harm.