摘要:

A leaf-mining fly,Hydrellia pakistanaeDeonier; a stem-boring weevil,Bagoussp. and a tuber-boring weevil,Bagoussp. nr.limosus(Gyll.) are stenophagous insects associated withHydrilla verticillatain Pakistan. Under field conditions and in the presence of its host,H. pakistanaedoes not infest any other plant. In the absence of the host and under confinement it does feed on leaves ofPotamogetonspp. It is widespread, fairly destructive, breeds frequently and is heavily parasitised.Bagoussp. is apparently specific but it attacks host tubers only when the water dries up. Adults and larvae ofBagoussp. nr.limosusdamage stems in water but usually remain restricted to the edges of a water-body because they need to pupate in moist soil on the bank.

ISSN:0143-6147    

DOI:10.1080/09670878009414393

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

The selective action of MSMA, benzoylprop-ethyl, nitrofen, dichlormate, terbutryne and methabenzthiazuron and their combinations with 2, 4-D for control of grass weeds in spring wheat (Triticum aestivumL.) was studied in two field experiments at Haryana Agricultural University, Hissar, India, during 1975–76 and 1976–77. The differences in response among wheat, wild canarygrass, wild oats and broadleaved weeds to post-emergence herbicides were very variable. Methabenzthiazuron at 1.75 and 2.0 kg/ha and terbutryne at 0.60 to 0.75 kg/ha sprayed in the wheat crop at maximum tillering stage killed more than 70% of wild canarygrass (Phalarisspp.) and wild oats (Avenaspp.) with no injury to the crop plants, resulting in the highest grain yield. The application of 2, 4-D (0.50 kg/ha) controlled only 55% wild canarygrass and 40% wild oats but significantly increased the wheat yields over the unweeded control. The other post-emergence herbicides were not effective in controlling both weeds selectively. 2, 4-D in combination with various herbicides was phytotoxic to the crop.

ISSN:0143-6147    

DOI:10.1080/09670878009414394

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

ISSN:0143-6147    

DOI:10.1080/09670878009414395

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

ISSN:0143-6147    

DOI:10.1080/09670878009414396

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

ISSN:0143-6147    

DOI:10.1080/09670878009414397

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

ISSN:0143-6147    

DOI:10.1080/09670878009414398

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

ISSN:0143-6147    

DOI:10.1080/09670878009414399

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

ISSN:0143-6147    

DOI:10.1080/09670878009414400

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

THE PESTICIDE MANUAL. A WORLD COMPENDIUM. Edited by C. R. Worthing. British Crop Protection Council, Croydon, 1979. ISBN 0 901436 44 5. Pp. 655. Price £20.00.

ISSN:0143-6147    

DOI:10.1080/09670878009414401

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

ISSN:0143-6147    

DOI:10.1080/09670878009414402

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor