ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1914.tb05415.x

出版商:Blackwell Publishing Ltd    

年代:1914

数据来源: WILEY

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1914.tb05416.x

出版商:Blackwell Publishing Ltd    

年代:1914

数据来源: WILEY

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1914.tb05417.x

出版商:Blackwell Publishing Ltd    

年代:1914

数据来源: WILEY

摘要:

SUMMARY1A description ofUrophora solstitialisL. and an account of its systematic position and geographical distribution are given, together with an abstract of the work of previous observers on this species.2A list of its British and continental food‐plants is given; the records of the latter show that on the continent the larvae feed on various species of thistles, and on three species ofCentaurea, but not onCentaurea nigra, whereas with the exception of one record of their occurrence onSerratula tinctoria, the larvae in this country are recorded as feeding exclusively onCentaurea nigra.3The life‐history, ovipositor, and method of oviposition are described, and descriptions and figures of the ova, larvae, and pupae are given. The life‐history is summarised on p. 118.4It is shown that owing to the formation of gails induced by larvae ofU. solstitialisin the flower‐heads of this weed a reduction in the number of seeds is effected amounting to about 50 per cent, in the heads examined. The gerininative capacity of the seeds produced in these galled heads was also adversely affected. In the germination experiment described 60‐5 per cent, fewer seeds germinated from galled flower‐heads ofV. nigrathan from ungalled ones. At a moderate estimate the number of seeds rendered non‐effective in galled flower‐heads ofC. nigrais placed at f)0 per cent. It is pointed out that Try‐paneids, whose larvae adversely affect the weeds of cultivated land, may be regarded as beneficial.6A short account and discussion of the recorded parasites ofU. solstitialisis given.7Some interesting features observed in the process of gall‐formation are referred to, and a few notes are added on some other insect inhabitants of the flow

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1914.tb05418.x

出版商:Blackwell Publishing Ltd    

年代:1914

数据来源: WILEY

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1914.tb05419.x

出版商:Blackwell Publishing Ltd    

年代:1914

数据来源: WILEY

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1914.tb05420.x

出版商:Blackwell Publishing Ltd    

年代:1914

数据来源: WILEY

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1914.tb05421.x

出版商:Blackwell Publishing Ltd    

年代:1914

数据来源: WILEY

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1914.tb05422.x

出版商:Blackwell Publishing Ltd    

年代:1914

数据来源: WILEY

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1914.tb05423.x

出版商:Blackwell Publishing Ltd    

年代:1914

数据来源: WILEY