摘要:

Pineapple growing is very important in the economy of many tropical countries, but nematodes are a very serious problem in this crop. Among the many phytophagous species found in the root zone of pineapples,Meloidogynespp.,Pratylenchusspp. andRotylenchulus reniformis(Linford and Oliveira) are particularly important.

ISSN:0030-7793    

DOI:10.1080/09670877509411384

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

Since the early 1960s, an apparently infectious disease of cloves has been spreading throughout W. Sumatra, one of the main clove producing areas of Indonesia. Preliminary field investigations were carried out in 1973, with a view to characterising the disease and attempts were made to isolate possible pathogenic organisms. Unfavourable soil and cultural conditions predispose trees to severe attack and present control is limited to correcting these factors.

ISSN:0030-7793    

DOI:10.1080/09670877509411385

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

The accepted strategy for the control of locust plagues is to check an upsurge of population before swarms break out and start a widespread plague. The organisation, men and materials necessary for this work must be establishedbeforelocust plagues are imminent. Primary targets for control are the hoppers. Red locust hoppers can be efficiently controlled only by vegetation baiting with dieldrin. The ULV drift-spraying method of application is particularly successful. Objections to the use of dieldrin on environmental grounds have been put forward but are without substance when the recommended method is used. A small aircraft can blanket spray 5,000 ha/h using the ultra low dosages necessary for desert locust hoppers. Three such aircraft could cope with the area of red locust hopper outbreaks although the dosage necessary for these is likely to be higher in the denser vegetation of their habitat. Field trials to establish the lowest dosage rate for red locust hoppers are urgently required.

ISSN:0030-7793    

DOI:10.1080/09670877509411386

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

Trichogrammatoidea armigera, Campoletis chlorodeaeandEucelatoriasp were sent to the Lesser Antilles in an effort to establish biological control ofHeliothis armigera. The success or otherwise of the releases has not yet been established. The importance of the pest warrants further introductions.

ISSN:0030-7793    

DOI:10.1080/09670877509411387

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

Small scale field trials were conducted to compare toxicity and residual activity on Holstein cattle of seven acaricides againstBoophilus microplus(Canestrini) in Trinidad. Tick populations were assessed before and after a single spraying at which the makers' recommended dilutions of acaricides were used. The effects were examined on a basis of a) initial kill of immature ticks, b) effects on the viability of engorged females, c) residual effect in preventing larval reattachment.

ISSN:0030-7793    

DOI:10.1080/09670877509411388

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

Because of recently acquired resistance of armyworm in Cyprus to prophyllactic spraying of methylparathion, a full investigation into the biology ofSpodoptera littoraliswas launched. It is not yet clear whether immigration to the Island occurs, but some moths can overwinter in “survival pockets” on the South coast. Pheromone traps and sterilisation are suggested as an alternative method of control. A more rational use of pesticides will cause less damage to natural enemies of the pest and reduce further development of resistance.

ISSN:0030-7793    

DOI:10.1080/09670877509411389

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

This paper describes the treatment of plant material entering Australia through quarantine. The methods used for screening plants during post-entry quarantine are discussed and the plant-houses and equipment and techniques used for sterilising soil and controlling pests are described. A list of plants tested for the effects of fumigation with methyl bromide is given and recommendations for fungicide and pesticide are listed.

ISSN:0030-7793    

DOI:10.1080/09670877509411390

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

During three seasons (1969, 1970, 1971) trials comparing the efficiency of four herbicides, and handweeding in controlling weeds of transplanted rice were carried out. The use of propanil or 2,4-D, IPE led to a reduction of the dry weight of weeds and to increases in grain yield.

ISSN:0030-7793    

DOI:10.1080/09670877509411391

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

Trials using glyphosate were carried out in forest plantations in Papua New Guinea. Weed control in three types of plantation was examined:a.plantations in grasslands dominated byImperata cylindrica(L.) P. Beauv.b.plantations with mixed grass and broadleaved weeds.c.plantations established in logged over rainforest and having vines, creepers and remnant woody broadleaved species as weeds.

ISSN:0030-7793    

DOI:10.1080/09670877509411392

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

In field experiments carried out at the Punjab Agricultural University, Ludhiana (India) during 1971–72 and 1972–73, methabenzthiazuron (70% a.i. w.p.) and nitrofen (24% wt/vol a.i.) applied pre-emergence gave remarkable control (90%) ofPhalaris minorL. (canary grass) in wheat. This work on the successful control of this obnoxious grassy annual weed in wheat is the first of its kind in the country. For these light textured soils (0.21% organic carbon and 75% sand), the effective dose of nitrofen was 1.20 kg a.i./ha and for methabenzthiazuron 0.70–1.05 kg a.i./ha. Nitrofen was specific forPhalarisonly, whereas methabenzthiazuron controlledPhalaris, Avena fatuaL. andChenopodiumsp. as well. These herbicides exhibited good selectivity to the crop. The maximum gains in grain yield due to herbicidal treatment over the weedy control were 1790 and 2510 kg/ha respectively for nitrofen and methabenzthiazuron.

ISSN:0030-7793    

DOI:10.1080/09670877509411393

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor