ISSN:0030-7793    

DOI:10.1080/09670877109413306

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Ecology is the study of the relationships of communities of living organisms with their environments and each other, in particular the factors affecting their numbers. Pest control is, essentially, modification by man of these numbers in an agricultural environment, and it is argued that investigations of and a general awareness concerning ecological factors are essential prerequisites for proper effectiveness. Examples from Malaysian plantations are given of major outbreaks and great expense arising from failure to observe these principles and, on the other hand, of ecological studies forming the basis of successful and cheap control procedures. Plantations exhibit a high degree of biological stability, especially in the continually warm and humid climate of Malaysia, so that many pests are of only potential severity, breaking out spasmodically, but conditions are also ideal for the existence of pests for their rapid increase if this stability is upset. Malaysia is predominantly agricultural and much dependent on efficient plantation production. Pests menace efficiency, but the insurance of continually increasing ecological knowledge will keep to a minimum both the economic impact of pests and the considerable risk of severely aggravating pest problems by unsuitable control measures. Some consideration is given to relating pest control practice in Malaysian plantations with modern thinking on environmental problems.

ISSN:0030-7793    

DOI:10.1080/09670877109413307

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

ISSN:0030-7793    

DOI:10.1080/09670877109413308

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

ISSN:0030-7793    

DOI:10.1080/09670877109413309

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

ISSN:0030-7793    

DOI:10.1080/09670877109413310

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

ISSN:0030-7793    

DOI:10.1080/09670877109413311

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

ISSN:0030-7793    

DOI:10.1080/09670877109413312

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Unpared banana corms were dipped in 300 ppm Nemacur P*for 10 min, 600 ppm for 5 min, and 1200 ppm for 5 s. Pared corms were dipped in 600 ppm for 5 min. Plants from pared corms were slower in growth and gave lower yields than plants from unpared corms. Retardation of growth was observed in plants from corms dipped in 300 ppm for 10 min, and from treated, pared corms, suggesting phytotoxic effects of Nemacur P at these rates of application. No phytotoxic effects were noted in the 600 ppm dip of unpared corms, or with the 1200 ppm dip. The 1200 ppm dip, and 600 ppm dip of pared corms were not effective in controlling nematodes. Best nematode control was obtained from dipping unpared corms in 600 ppm Nemacur P.

ISSN:0030-7793    

DOI:10.1080/09670877109413313

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Dimethoate 0.5% for 6 h was the most effective dip for suppressing the root-knot nematode,Meloidogyne incognita(Kofoid and White, 1919) (Chitwood, 1949). It was better than all the other treatments except 0.025% dimethoate for 6 h. Dimethoate at 0.1 and 0.2% and 0.2% parathion and diazinon as 6 h root-dips were phytotoxic. Diazinon controlled the nematode poorly and malathion was ineffective.

ISSN:0030-7793    

DOI:10.1080/09670877109413314

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

The fungi observed on the seeds of the Siam weed (Eupatorium odoratum) are mainlyFusarium culmorum, F. moniliforme, F. semitectum, F. solani, Cladosporium herbarumandCurvularia lunata. The possibility that these fungi can be effectively disseminated far and wide by the seeds of the Siam weed is discussed.

ISSN:0030-7793    

DOI:10.1080/09670877109413315

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor