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Bollworm sampling for action thresholds in sub-saharan Africa : spatial and probability distribution

Gozé E., Nibouche S., Deguine J.P.. 2000. In : Gillham Fred M. (ed.). New frontiers in cotton research : Proceedings of the world cotton research conference - 2, Athens, Greece, September 6-12, 1998. Washington : ICAC, p. 883-884. World Cotton Research Conference. 2, 1998-09-06/1998-09-12, Athènes (Grèce).

A diagonal sampling plan is proposed for monitoring insect infestation in cotton tofacilitate spraying, based on action thresholds, to control Helicoverpa armigera in sub-Saharan Africa. The spatial distribution of larvae was studied with variograms. The probability distribution was inferred from the relationship between mean and variance. The probability distribution parameters were obtained by maximum likelihood estimation.

Mots-clés : gossypium; helicoverpa armigera; distribution spatiale; Échantillonnage; insecte nuisible; seuil économique; niveau de préjudice économique; dégât; afrique au sud du sahara; afrique occidentale

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