Spatial distribution of Frankliniella occidentalis (Thysanoptera: Thripidae) in greenhouse crops: location of infestation foci and distribution patterns

Mateus, C. and Araújo, J. and Mexia, A. (2004) Spatial distribution of Frankliniella occidentalis (Thysanoptera: Thripidae) in greenhouse crops: location of infestation foci and distribution patterns. Acta Phytopathologica et Entomologica Hungarica, 39 (1-3). pp. 157-164. ISSN 0238-1249

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Abstract

The spatial distribution of Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae) was analysed in ornamental crops (roses and spray-type carnations) and horticultural crops (pepper and strawberries), inside greenhouses, using sticky traps. In ornamental crops, at low population densities, during the winter, there was not a constant location of the isolated foci of infestation, from one week to the next, or a specific pattern of variation in that location. In spray-type carnations, pepper and strawberries, at higher population densities, in spring and summer, the basic units of distribution were the individuals, and they were aggregated. For roses, at those population levels, a random distribution was observed, with a tendency for aggregation. The number of traps needed to estimate population densities, in each crop, was evaluated for two fixed levels of precision (0.10 and 0.25) and results are indicated and discussed.

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