Neotropical Entomology (2003) 32, 107-115

Marcos G. Fernandes, Antonio C. Busoli and José C. Barbosa (2003)
Distribuição Espacial de Alabama argillacea (Hübner) (Lepidoptera: Noctuidae) em Algodoeiro
[Spatial distribution of Alabama argillacea (Hübner) (Lepidoptera: Noctuidae) on cotton crop]
Neotropical Entomology 32 (1), 107-115
Abstract: The knowledge of the dispersion pattern of the pests on a crop is fundamental for establishing an appropriated sequential sampling method. Also it permits the correct utilization of control strategies and optimization of sampling techniques. The objective of this research was to determine the spatial distribution of larvae of Alabama argillacea (Hübner) on cotton crop, CNPA ITA-90 cultivar. During the 1998/99 growing season a sampling system was applied in three experimental areas located at Itamarati Sul S.A. farm in the region of Ponta Pora, estate of Mato Grosso do Sul, Brazil. The areas measured 1 ha and contained 100 plots with 100 m². In a weekly basis the number of small, medium and large larvae were counted on five plants per plot. The aggregation indexes (variance/ mean ratio and Morisita index), the chi-square test and the adjust of observed and expected values to theoretical distributions of frequencies (Poisson, positive binomial and negative binomial) showed that all stages of cotton leafworm larvae were distributed according to the contagious model, fitting the Negative Binomial Distribution during the whole period of infestation.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
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Database assignments for author(s): Marcos Gino Fernandes

Research topic(s) for pests/diseases/weeds:
surveys/sampling/distribution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Alabama argillacea	Cotton (Gossypium)	Brazil (south)