n African Entomology - Spatial distribution of lepidopterous stem borers on indigenous host plants in West Africa and its implications for sampling schemes

Volume 12, Issue 2
  • ISSN : 1021-3589



A catalogue of the major indigenous host plants in West Africa of maize stem borers, the noctuids Hampson and (Fuller) (Lepidoptera : Noctuidae), and the pyralid Walker (Lepidoptera : Pyralidae), was established during surveys in Benin, Ghana and the Ivory Coast. Thirteen hosts were identified for , ten for and two for . The non-gramineous hosts were the two sedge species, and (Linn.) Britt. was infested by and , and was infested by only. In general, borer densities were much lower than those reported from maize. For the development of sampling plans, dispersion was described for all species using Taylor's power law and a non-linear model which gives the relationship between the proportion of infested plants [P(I)] and the mean density (). The majority of host-plant species yielded an aggregated distribution of stem borers, corroborating results of various authors. Mean dispersion was similar among insect species, thus common optimal sample size / mean density curves were developed for all borer species. Enumerative sampling procedures are proposed as binomial sampling plans were shown to be less efficient.

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