Impacts of spinosad and lambda-cyhalothrin on spider communities in cabbage fields in south Texas.

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Liu TX, Irungu RW, Dean DA, Harris MK

Impacts of spinosad and lambda-cyhalothrin on spider communities in cabbage fields in south Texas.

Ecotoxicology. 2013 Apr;22(3):528-37. doi: 10.1007/s10646-013-1045-1. Epub 2013 Mar 3.

PubMed ID
23455995 [ View in PubMed
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Abstract

Spiders are a principal arthropod group that preys on numerous pests of vegetables and other crops. In this study, we determined the effects of the two most commonly used insecticides, spinosad and lambda-cyhalothrin, on diversity of spiders on cabbage in south Texas. In two seasons (fall 2008 and spring 2009), we collected a total of 588 spiders belonging to 53 species in 11 families from spinosad and lambda-cyhalothrin-treated cabbages and the untreated control plants. A great majority of spiders were collected from the pitfall traps (554) where only a few (34) were collected from the blower/vacuum sampling. In the insecticide-treated plots, there were significantly fewer spider individuals, species and families than in untreated fields. Spinosad had significantly less effect on spiders in total individuals, number of species and families than lambda-cyhalothrin. The effects of the two insecticides were further demonstrated by the Shannon-Weiner index (H') and the hierarchical richness index (HRI). Spider diversity in the spinosad-treated plots were not significantly different from that in the untreated fields but were greater than those in lambda-cyhalothrin-treated plots in both seasons when measured by H' values. In contrast, the H' values of spider's diversity in the lambda-cyhalothrin-treated plots were significantly lower than spinosad-treated and untreated plots. High values of HRI for spider richness in the spinosad-treated plots suggested that spinosad had less effect on spiders than lambda-cyhalothrin. We concluded that spinosad was more compatible with spiders on cabbage compared to lambda-cyhalothrin and that this information should be used when developing insecticide resistance management strategies.

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