东方胎球蚧的生物学特性及防治

东方胎球蚧在长春年生1代，以2龄若虫固着在二年生枝条的芽腋、分枝和不光滑处群集越冬。3月末至4月初开始活动为害。越冬若虫为害盛期为4月下旬至6月初。此时虫体明显膨大。5月下旬至6月上旬为成虫期和卵盛期。7月初起当年若虫自介壳下爬出分散转移到叶片、叶炳和嫩枝上为害，老虫共2龄。调查未见雄虫，均行孤雌生殖。主要天敌有黑缘红飘虫和一种寄生性小峰。当前生产上可在若虫越冬后为害盛期前和当年若虫出壳分散期。因地制宜地用有机磷或合成菊酯类杀虫剂进行常规喷雾。防治效果均较好。

Bionomics of Parthenolecanium orientalis Borchsenius and its control

Parthenolecanium orientalis Borchsenius completes one generation annually in Changchun. The 2nd instar nymphs fix on the bug axil, twigs and some rough places of binnial branches for passing through winter. This pest starts moving and barming the host plants from the end of March to the beginning of April, They attack plants more seriously from the last ten days of April to the beginning of June. During this time, these incect bodies become obviously big. The nymphs born at the present year under the scales remove to thc leaves and twigs to harm host plants at the beginning of July.There are two instars during tbe nymph stage. None of the male insect has been found during our investigation. The females can reproduce without mating. Chilocorus rubidus Hope and a kind of parasitic wasps are the main natural enemies. At the present time, some organophosphorous and synthetic pyrethrins insecticides could be used to control this pest at the time before the nymphs passed through winter and start harming seriously, also during the nymphs reproduced at the present year diffuse, the good control effects could be obtained.