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EVALUATING PYRETHROID ALTERNATIVES FOR THE MANAGEMENT OF COTTON BOLLWORMS AND RESISTANCE IN CAMEROON

Published online by Cambridge University Press:  01 January 2009

J. ACHALEKE ,
M. VAISSAYRE  and
T. BREVAULT
J. ACHALEKE
Affiliation:
IRAD, PRASAC-ARDESAC, Cotton Program, Garoua, Cameroon
M. VAISSAYRE
Affiliation:
CIRAD, UPR Annual Cropping Systems, Montpellier, F-34398France
T. BREVAULT*
Affiliation:
IRAD, PRASAC-ARDESAC, Cotton Program, Garoua, Cameroon CIRAD, UPR Annual Cropping Systems, Montpellier, F-34398France
*
§Corresponding author. Address for correspondence: CIRAD, TA B-10/02, Avenue Agropolis, 34 398 Montpellier Cedex 5, France Email: thierry.brevault@cirad.fr
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Summary

In sub-Saharan Africa, the bollworm complex, including Helicoverpa armigera, Diparopsis watersi and Earias spp., threatens the continued success of cotton production. Pyrethroid resistance in H. armigera led to serious crop losses while endosulfan, a suitable alternative to pyrethroids, was banned for cotton pest management. Five candidates with no cross-resistance to pyrethroids were evaluated in both on-station and on-farm trials from 2002 to 2006. Two applications were made at the early peak of H. armigera infestation in September, the period when pyrethroid use should be restricted for resistance management purposes. Results showed that, as expected, bollworm infestation consistently peaked from mid-September to mid-October. Spinosad, thiodicarb and emamectin-benzoate were the most suitable alternatives to reduce damage, regardless of the cotton bollworm species. Indoxacarb and lufenuron were less effective in controlling D. watersi. On-farm experiments confirmed the suitability of spinosad for control of pyrethroid-resistant H. armigera, particularly on late sown fields. These new chemistries offer control of bollworms which justify their relevance for pyrethroid resistance management in Cameroon and sub-Saharan Africa.

Type
Research Article
Information
Experimental Agriculture , Volume 45 , Issue 1 , January 2009 , pp. 35 - 46
Copyright
Copyright © Cambridge University Press 2008

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