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Population density, development and behaviour of Diopsis longicornis and D. apicalis (Diptera: Diopsidae) on rice in the Republic of Guinée

Published online by Cambridge University Press:  10 July 2009

H. Chiasson  and
S.B. Hill
H. Chiasson*
Affiliation:
Department of Entomology, Macdonald Campus of McGill University, Canada
S.B. Hill
Affiliation:
Department of Entomology, Macdonald Campus of McGill University, Canada
*
H. Chiasson, Department of Entomology, Macdonald Campus of McGill University, Ste-Anne-de-Belevue, QC Canada H9X 3V9.
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Abstract

The behaviour and pest status of the rice stem borers Diopsis longicornis Macquart and D. apicalis Dalman were investigated in the Republic of Guinée, particularly during the dry season. The variables were direct seeded and transplanted rice, and three (1988, 1989) and four (1987) planting dates. Transplanted rice was damaged nearly three times more than direct seeded rice in the dry season, but no significant difference was detected during the wet season. As previously observed in other West African countries, D.apicalis only occasionally damages rice in Guinée. Contrary to findings elsewhere, D. longicornis was not an important pest of Guinean rice, infesting only 5% and 3% of stems over the three dry and the two wet seasons, respectively. However, year round rice production could promote build up of the diopsid population if dry season planting is not sufficiently delayed (45 days) after the last rains of the wet season.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 83 , Issue 1 , March 1993 , pp. 5 - 13
Copyright
Copyright © Cambridge University Press 1993

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