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African Crop Science Journal
African Crop Science Society
ISSN: 1021-9730
EISSN: 2072-6589
Vol. 4, No. 2, 1996, pp. 207-214
Bioline Code: cs96058
Full paper language: English
Document type: Research Article
Document available free of charge

African Crop Science Journal, Vol. 4, No. 2, 1996, pp. 207-214

 fr
Odongo, B. & Foster, R.

Résumé

Les recherches ont ete menees pour determiner les effets de paillis, de
Bacillus thuringiensis var tenebrionis (Bt), et esfenvalerate (Asana)
sur Leptinotarsa decemlineata (Say) (Coleoptere: Chrisomelidae), une
peste de la pomme de terre, et sur les ennemis naturels Podisus
maculiventris (Say), Perillus bioculatus (F) (Hemiptera:
Pentatomidae) et Lebia grandis Hentz (Coleoptera: carabidae). Les scarabees
adultes etaient significativement (P=0.05) peu nombreux sur la pomme de terre
avec ou sans paillis arrosee de Bt et d'Asana que sous controles. Les larves
et ennemis naturels etaient plus nonbreux sur Bt et traitements sans
insecticides que sur les plantes en parcelles d'esfenvalerate. Cependant, les
differences des traitements n'etaient pas significativement differentes (P =
0.05). Le paillis et le Bt ont supprime la population des scarabees et a
preserve les insectes indigenes benefiques. Nous recommandons, par
consequent, que le paillis ete le Bt soient utilises dans un programme de
lutte integree contre la peste L. decemlineata.

Mots Clés
Lebia grandis, Perillus bioculatus, Podisus maculiventris

 
 en Leptinotarsa decemlineata (Coleoptera: Chrysomelidae) and natural enemy relations as influenced by straw mulch, Bacillus thuringiensis and esfenvalerate insecticide
Odongo, B. & Foster, R.

Abstract

Studies were conducted to determine the effects of straw mulch, Bacillus
thuringiensis var tenebrionis (Bt) and esfenvalerate (Asana) on
Leptinotarsa decemlineata (Say) (Coleoptera: Chrysomelidae), a pest of
potato,  and on natural enemies Podisus maculiventris (Say),
Perillus bioculatus (F) (Hemiptera: Pentatomidae) and Lebia grandis
Hentz (Coleoptera: Carabidae).  Adult beetles were significantly (P=0.05)
fewer on potato with or without mulch but which were sprayed with Bt and
Asana than on the checks.  Larvae and natural enemies were more on Bt and
non-insecticide treatments than on plants in esfenvalerate plots.  Treatment
means, however, were not significant  (P=0.05).  Mulch and Bt suppressd
beetle population and preserved good levels of indigenous beneficial insects. 
We recommend that mulch and Bt can be applied within an integrated pest
management programme for L. decemlineata.

Keywords
Lebia grandis, Perillus bioculatus, Podisus maculiventris

 
© Copyright 1996 - African Crop Science Society

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