栾多态毛蚜形态特点和自然蚜量变动规律的研究

MORPHOLOGICAL CHARACTERS AND POPULATION DYNAMICS OF PERIPHY LLUS KOELREUTO RIAE(TAKAHASHI)

栾多态毛蚜[Periphyllus koelreutoriae(Takahashi)]的蚜型类别较多,在其年生活周期中,除若干为害型蚜外,还出现以越夏滞育型蚜越夏阶段,越夏滞育型蚜、性母、性蚜等形态独特,是多态毛蚜属的主要代表。通过调查,4月下～5月上、中旬为无翅胎生雌蚜的发生盛期。5月上旬为有翅胎生雌蚜的发生初期,盛期在5月中～下旬。越夏滞育型蚜发生初期为5月上旬,盛期为5月中旬或稍后。雌、雄性蚜发生盛期基本一致,均在10月下～11月上旬。

Periphyllus koelreutoriae (Takahashi) has a lot of unigue types in its yearly life cycle such as over-summering diapause aphid,sexupara,sexuale etc.besides certain harmful types.It is a main representative of the genus Periphyllus.After investigation it is shown that winged aphids occur thrivingly from the last tendays of April to the first ten days of May.The primary occurance of wingless aphids is inthe first ten days of May,and the thriving occurance during the period of the second andlast ten days of May.The primary occurance of diapause aphids is in the first ten days ofMay,and the thriving occurance period during the second ten days of May or a little late.Female and male sexuales occur thrivingly from the last ten days of October to the firstten days of November consistently.