Bollworm sampling for action thresholds in sub-saharan Africa : spatial and probability distribution
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.
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| Main Authors: | , , |
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| Format: | conference_item biblioteca |
| Language: | eng |
| Published: |
ICAC
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| Subjects: | H10 - Ravageurs des plantes, Gossypium, Helicoverpa armigera, distribution spatiale, échantillonnage, insecte nuisible, seuil économique, niveau de préjudice économique, dégât, http://aims.fao.org/aos/agrovoc/c_3335, http://aims.fao.org/aos/agrovoc/c_30255, http://aims.fao.org/aos/agrovoc/c_36230, http://aims.fao.org/aos/agrovoc/c_6774, http://aims.fao.org/aos/agrovoc/c_5729, http://aims.fao.org/aos/agrovoc/c_24921, http://aims.fao.org/aos/agrovoc/c_34265, http://aims.fao.org/aos/agrovoc/c_26768, http://aims.fao.org/aos/agrovoc/c_166, http://aims.fao.org/aos/agrovoc/c_8355, |
| Online Access: | http://agritrop.cirad.fr/477468/ http://agritrop.cirad.fr/477468/1/477468.pdf |
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