摘要:

Summary1This paper, the second in a short series on biological studies of the death‐watch beetle,Xestobium rufovillosumDe G., is concerned with the life of the adult, egg‐laying and hatching.2Times of pupation and emergence in the natural habitat of the insect in decayed parts of willow, and in timbers in buildings are discussed and compared.3The rate of development of the reproductive organs after pupation and until egg‐laying starts, is described.4The habits of the adults, activity, tapping, fight and mode of pairing are commented upon.5The major part of the paper deals with oviposition which has been studied out of doors and under controlled tempemture and humidity in the laboratory.6Out of doors forty to eighty eggs per female are laid during May and June over a period of 6–9 weeks. The egg stage lasts from 3 to 5 weeks, according to temperature conditions.7In the laboratory, oviposition and the hatching of the egg were studied at 15, 20, 25 and 30°C. and relative humidities of 23, 41, 53, 75, 86 and 95 %. The results are discussed in relation to the effect of temperature, relative humidity and saturation deficiency.8“Indices of suitability” for various combinations of temperature and humidity in relation to egg‐laying and hatching are calculated from the experimental data.9It is shown that an increase in temperature to a maximum between 25 and 30°C. is favourable but that the optimum conditions must include a low saturation deficiency. The data demonstrate an increasing tolerance, by the insect, of dryness associated with a rise in temperature.10The application of these findings to the occurrence and spread ofXestobiumin buildings is br

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1938.tb04355.x

出版商:Blackwell Publishing Ltd    

年代:1938

数据来源: WILEY

摘要:

SummaryIn the field the chief larval host plants ofGeomyza tripunctataFall. areLolium perenneandL. italicum;in the laboratory other grasses and wheat are readily attacked. The damage is similar to that caused byOscinella fritL.; the larva feeds inside the grasses and kills the central shoot.

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1938.tb04356.x

出版商:Blackwell Publishing Ltd    

年代:1938

数据来源: WILEY

摘要:

Summary1An account is given of field experiments in 1935 with pyrethrum and derris preparations for the control ofPhaedon cochleariaeF. on watercress plants.2Average infestations, judging by the beetle population on the untreated plots, were reduced by:(a)Pyrethrum emulsion of 0.01 % content of pyrethrin I to 37.9 %.(b)Derris wash of 0.004 % rotenone content to 22.4%.(c)Derris dust of 0.2 % rotenone content to 13.7 %.(d)Derris dust of 0.5 % rotenone content to 3.1 %.3The difficulties involved in the general application of insecticides for the successful control of the beetle in commercial culture of watercress are discussed.4A basis for controlling the beetle by means of direct measures is presented in the light of observations on extended trials by watercress growers in1936, based upon a consideration of the results obtained from the 1935 field experiments and from a study of the life history of the insect.

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1938.tb04357.x

出版商:Blackwell Publishing Ltd    

年代:1938

数据来源: WILEY

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1938.tb04358.x

出版商:Blackwell Publishing Ltd    

年代:1938

数据来源: WILEY

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1938.tb04359.x

出版商:Blackwell Publishing Ltd    

年代:1938

数据来源: WILEY

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1938.tb04360.x

出版商:Blackwell Publishing Ltd    

年代:1938

数据来源: WILEY

摘要:

A Textbook of Plant Virm Diseases. By KennethM. Smith.Economic Botany: A Textbook of Useful Plalzts and Plant Products. By A. F. Hill.Practical Plant Breeding. By W. J. C. Lawrence.British Stem‐ and Leaf‐Fungi(Coeolomycetes). Vol. II.Sphaeropsidales and Melanconiales. By W. B. Grove.Plant Ecology. By HildaDrabble.The Properties and Functions of Membranes, Natural and Artificial.Perspectives in Biochemistry. Edited by JosephNeedhamand DavidE. Gr

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1938.tb04361.x

出版商:Blackwell Publishing Ltd    

年代:1938

数据来源: WILEY