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Optimisation de l'application du Metarhizium anisopliae var. acridum sur le criquet puant, Zonocerus variegatus (Orthoptera: Pyrgomorphidae)

Published online by Cambridge University Press:  28 February 2007

O.K. Douro Kpindou ,
C. Gbongboui ,
R. Badou ,
E. Paa-Kwessi ,
J.B. Ackonor  and
J. Langewald
O.K. Douro Kpindou*
Affiliation:
Biological Control Centre for Africa, International Institute of Tropical Agriculture 08 B.P. 0932 Cotonou, Bénin
C. Gbongboui
Affiliation:
Biological Control Centre for Africa, International Institute of Tropical Agriculture 08 B.P. 0932 Cotonou, Bénin
R. Badou
Affiliation:
Service National de la Protection des Végétaux, B.P. 58, Porto-Novo, Bénin
E. Paa-Kwessi
Affiliation:
Plant Protection and Regulatory Service Department, PO Box M.37FI, Accra, Ghana
J.B. Ackonor
Affiliation:
Cocoa Research Institute of Ghana, PO Box New Tafo Akim, Ghana
J. Langewald
Affiliation:
Biological Control Centre for Africa, International Institute of Tropical Agriculture 08 B.P. 0932 Cotonou, Bénin
*
*Email: [email protected]
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Abstract

Field experiments on reduced application doses of Metarhizium anisopliae var. acridum (I 91 609: Zonocerus variegatus strain) were carried out in 1996–1997 in southeastern Benin and central Ghana. The first experiment, which took place in southeastern Benin, consisted of ULV applications of an oil based formulation of M. anisopliae on 1-ha plots of cassava, at the rates of 1 × 1011, 4.65 × 1011 2.5 × 1012 and 1 × 1013 conidia/ha. In a second experiment carried out in central Ghana, the application doses were reduced by increasing the space between spray tracks. Treatments were applied at 5, 10 and 20m track spaces, corresponding to doses of 2.5 × 1012, 1.25 × 1012 and 0.625 × 1012 conidia/ha, respectively. After application, samples of L4–L6 larvae and adults of Z. variegatus were collected using sweep nets and their mortality monitored in small cages. Zonocerus variegatus population density was monitored at three-day intervals over a 21-day period. In southeastern Benin, analysis of survival time, resulting from the first sampling, did not reveal any significant difference between the various dose treatments. In central Ghana, for treatments at different doses and track spaces, there was no difference between 5 and 10m track spaces, corresponding to 2.5 × 1012 and 1.25 × 1012 conidia/ha. But the 1.25 × 1012 conidia/ha treatment at 10 m-track space reduced the application time by half (17 min instead of 34 min).

Keywords

Zonocerus variegatusMetarhizium anisopliae var. acridumdoseoptimisation
Type
Research Article
Information
International Journal of Tropical Insect Science , Volume 25 , Issue 4 , December 2005 , pp. 251 - 258
Copyright
Copyright © ICIPE 2005

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