摘要:

A biconical trap is described which incorporates a 5 KV electrocuting grid to stun tsetse flies, which then fall via a funnel into a preservative in a tube segregator capable of separating the catch at intervals of 1–24 hours. The trap was effective in Upper Volta and Ivory Coast againstGlossina tachinoides(Westw.) andG palpaliss. 1. respectively. A 12 V 45Ah battery allowed continuous operation for over 20 days.

ISSN:0143-6147    

DOI:10.1080/09670878109414175

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

The effect of pre-harvest rodent damage on the yield of rice is difficult to demonstrate because other factors affecting yield tend to obscure the effect and because examination of the crop, unless carried out on the day of harvest, fails to give an accurate picture of damage. Here we show that tiller density is the main non-rodent factor affecting yield. By using a partial regression equation to hold tiller density constant a statistically significant relationship was established between yield and damage counts made at harvest. In ten rice fields the average yield reduction attributable to rodents was 19% and ranged from 2% to 43%. Losses to rodents may be assessed more easily by comparing actual yield with potential yield as estimated from tiller density, provided that the relationship between yield and tiller density is known, for a series of fields that differ primarily in the degree of rodent attack.

ISSN:0143-6147    

DOI:10.1080/09670878109414176

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Droplets of water and water + oil emulsions from a spinning disc were sampled simultaneously at 10, 30 and 200 cm below the disc on magnesium oxide coated slides. The addition of oil affects the initial droplet size and reduces the change in size due to evaporation of the water.

ISSN:0143-6147    

DOI:10.1080/09670878109414177

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

ISSN:0143-6147    

DOI:10.1080/09670878109414178

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

ISSN:0143-6147    

DOI:10.1080/09670878109414179

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

ISSN:0143-6147    

DOI:10.1080/09670878109414180

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

ISSN:0143-6147    

DOI:10.1080/09670878109414181

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

ISSN:0143-6147    

DOI:10.1080/09670878109414182

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

ISSN:0143-6147    

DOI:10.1080/09670878109414183

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

ISSN:0143-6147    

DOI:10.1080/09670878109414184

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor