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Relationship between Smicronyx spp. population and galling of Striga hermonthica (Del.) Benth

Published online by Cambridge University Press:  19 September 2011

Lenli Claude Otoidobiga ,
Charles Vincent  and
Robin K. Stewart
Lenli Claude Otoidobiga
Affiliation:
Institut National de l'Environnement et de la Recherche Agricoles Laboratoire de Recherches de la Protection des Végétaux B. P. 403 Bobo-Dioulasso, Burkina Faso, West Africa
Charles Vincent*
Affiliation:
Horticultural Research and Development Centre, Agriculture and Agri-Food Canada, 430 Gouin Blvd., Saint-Jean-sur-Richelieu, QC Canada J3B 3E6
Robin K. Stewart
Affiliation:
Department of Natural Resource Sciences, Macdonald Campus of McGill University, 21111 Lakeshore Road, Ste-Anne-de-Bellevue, QC, Canada H9X 3V9
*
E-mail: E-mail: VINCENTCH@EM.AGR.CA
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Abstract

Investigations were conducted in six farm fields (1.5 to 3 ha each) in Burkina Faso with objectives to (1) study adult Smicronyx spp. (Coleoptera: Curculionidae) population dynamics during Striga hermonthica (Scrophulariaceae) seed-pod production, (2) assess the impact of different population levels of Smicronyx spp. on St. hermonthica capsule production and, (3) estimate Smicronyx female reproductive success in seed-pod galls. A Univac portable sampler was used to sample adult Smicronyx spp. and St. hermonthica densities were assessed using aim2 metal quadrat. Fifty St. hermonthica shoots per field were sampled each week. Before the emergence of St. hermonthica, Smicronyx adults were found on nearby Striga éspera (Willd) Benth. fields. Striga hermonthica shoots produced on average ca. 24 seed capsules each, while each female Smicronyx galled from 12 to 32 seed pods. Seed-pod galling alone was not sufficiently high to be considered as a successful reduction factor for St. hermonthica seed production in natural conditions. Smicronyx spp. adult population levels decreased during the St. hermonthica capsule production period. Increased population levels of Smicronyx spp. resulted in higher percentages of St. hermonthica seed-pod galls, suggesting that a ugmentative techniques, if used as part of an integrated control programme could be a worthwhile strategy.

Résumé

Des recherches ont été menées dans six champs (chacun mesurant de 1.5 à 3 ha) de paysans avec pour objectifs (1) d'étudier la dynamique des adultes durant la période de production des graines de St. hermonthica, (2) d'étudier l'impact de niveaux différents de populations de Smicronyx spp. sur la production de capsule de St. hermonthica et (3) d'estimer le succès de reproduction des femelles dans les galles. Les populations d'adultes Smicronyx spp. ont été échantillonnées à l'aide d'un aspirateur portable Univac. Cinquante tiges de St. hermonthica ont été échantillonnées chaque semaine et la densité des adultes Smicronyx a été évaluée à l'aide d'un quadrat métallique de 1m2. Avant l'émergence de St. hermonthica, les adultes Smicronyx ont été trouvés sur des plantes de Striga éspera (Willd) Benth. situés dans des champs en proximité. Les tiges de St. hermonthica ont produit en moyenne 24 capsules chacunes, et chaque femelle Smicronyx a gallé de 12 à 32 capsules. La seule action gallicole des capsules n'était pas suffisante pour être considérée comme étant un facteur ayant du succès pour réduire la production de graines de St. hermonthica. Les niveaux de populations d'adultes de Smicronyx spp. ont diminué pendant la période de production de capsules de St. hermonthica. Des populations plus élevées de Smicronyx ont causé des dommages plus élevées de capsules de St. hermonthica, ce qui suggère qu'une approche augmentative pourrait être une stratégie intéressante dans le cadre d'un programme de lutte intégrée

Keywords

Smicronyx spp.CurculionidaeStriga hermonthicaScrophulariaceaewitchweedsbiological controlgallingSmicronyx spp.CurculionidaeStriga hermonthicaScrophulariaceaewitchweedslutte biologiquegalles
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 18 , Issue 3 , September 1998 , pp. 197 - 203
Copyright
Copyright © ICIPE 1998

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