Pyrethroid resistance in the cotton bollworm, Helicoverpa armigera (Hübner), in West Africa

Martin Thibaud, Ochou Ochou Germain, Hala N'Klo François, Vassal Jean-Michel, Vaissayre Maurice. 2000. Pyrethroid resistance in the cotton bollworm, Helicoverpa armigera (Hübner), in West Africa. Pest Management Science, 56 (6) : 549-554.

https://doi.org/10.1002/(sici)1526-4998(200006)56:6<549::aid-ps160>3.0.co;2-y

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Autre titre : Résistance de Helicoverpa armigera (Hübner) aux pyrethrinoides en Afrique de l'Ouest

Résumé : The susceptibility of Helicoverpa armigera to pyrethroids has been investigated in West Africa by means of laboratory bioassays since 1985, the first year of widespread pyrethroid use. For some years, this survey has shown a tendency for the pest to become more tolerant to pyrethroids. During the 1996 growing season, farmers using calendar-based spraying programmes reported control failures in various countries. The strong efficacy of cypermethrin on small larvae was confirmed in experimental plots, but the effect decreased quickly in successive instars. Bioassays performed on resistant strains revealed an increase in LD50 that was related to different resistance mechanisms. Metabolic resistance (MFO) appears to be a possible primary mechanism of resistance to pyrethroids. Target modification (kdr) is involved to a small degree and esterases seem to appear only after additional selection pressure.

Mots-clés Agrovoc : Gossypium, insecte nuisible, Helicoverpa armigera, résistance aux produits chimiques, pyréthrine de syntèse, insecticide, lutte anti-insecte, lutte chimique

Mots-clés géographiques Agrovoc : Afrique occidentale

Classification Agris : H10 - Ravageurs des plantes

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