摘要:

Simple pheromone traps were assessed to identify a suitable trap for use in Tanzania to monitor population size and subsequently forecast outbreaks ofHeliothis armigera.The Ukiriguru trap was found to be satisfactory and was therefore adopted. The efficiency of the Ukiriguru pheromone trap relative to a Robinson light trap in monitoring the activity ofH. armigerawas also assessed over a three year period. Overall, although the light trap caught a proportionately higher number of moths, there was evidence that the pheromone trap could be used reliably to monitor the activity of this insect in Tanzania until a more suitable trap is identified. The relationship between the number of moths caught in the pheromone and light traps was studied. Although the number of females and males caught at the light trap at peak catch were in phase in two out of the three years of study, there was no relationship between the ratio of males to females with the size of female catch. The relationship between the number of moths caught at the pheromone trap and moths caught at the light trap was variable. Similarly, the ratio of males caught in the pheromone trap to the number of females caught in the light trap with the size of the female catch in the light trap was also variable. Thus, further studies on the sexual structure of moth catches at the pheromone and light traps is needed to increase the understanding of how these traps function.

ISSN:0143-6147    

DOI:10.1080/09670878809371300

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

The crop losses due to insects in the savannah area of the Ivory Coast during the past few years are presented for the main crops (cotton, maize, irrigated rice, groundnut) and for some stored products (maize, yam). Losses of 60% are found in the southeast of the area for cotton and maize. For these two crops, as well as for stored products, the entomological risk decreases northwards and westwards. For the other crops, losses are similar throughout the whole area, reaching 30% for the irrigated rice whereas groundnut is little attacked (2·4% losses). The main insect pests are mentioned.

ISSN:0143-6147    

DOI:10.1080/09670878809371301

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

ISSN:0143-6147    

DOI:10.1080/09670878809371302

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Village Republics: economic conditions for collective action in South India.R. Wade, 1988. Cambridge, Cambridge University Press, ISBN 0–521–30146–7

ISSN:0143-6147    

DOI:10.1080/09670878809371303

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

ISSN:0143-6147    

DOI:10.1080/09670878809371304

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

ISSN:0143-6147    

DOI:10.1080/09670878809371305

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

ISSN:0143-6147    

DOI:10.1080/09670878809371306

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

ISSN:0143-6147    

DOI:10.1080/09670878809371279

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor