Aggregation Indices of Cotton Arthropods in Texas 1

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Abstract
Two indices were used to quantify the aggregation of cotton arthropods: the parameter K of the negative binomial distribution and Morisita's index of dispersion I δ. Using frequency distribution data the average values of these indices were calculated. In general there was close agreement between K and I δ. Cotton fleahopper, Pseudatomoscelis seriatus (Rueter), nymphs were more aggregated than fleahopper adults. A greater degree of aggregation was observed for boll weevil, Anthonomus grandis Boheman, eggs than for boll weevil adults. Bollworm, Heliothis zea (Boddie), and tobacco budworm, H. virescens (F.), eggs exhibited more aggregation than Heliothis spp. larvae. Aggregation continued to decrease as the Heliothis spp. larvae became full grown. Among the predatory cotton arthropods, lady beetles and minute flower bugs, Orius spp., displayed the greatest amount of aggregation. Big-eyed bugs, Geocoris spp., were less aggregated and the spatial distributions of spiders were the least aggregated of the predatory arthropods.

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