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 λ-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 λ-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 λ-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 λ-cyhalothrin-treated plots in both seasons when measured by H′ values. In contrast, the H′ values of spider’s diversity in the λ-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 λ-cyhalothrin. We concluded that spinosad was more compatible with spiders on cabbage compared to λ-cyhalothrin and that this information should be used when developing insecticide resistance management strategies.
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Acknowledgments
The authors wish to thank the crew at the Vegetable IPM Laboratory, Texas AgriLife Research at Weslaco for their valuable help. We also thank the following organizations for financial supports during the period of research, data analysis and writing: the State Key Fundamental Research and Development Plan (2012CB017359), National Natural Science Foundation of China (31272089), China Agricultural Research System (CARS-25), and Northwest A&F University.
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All benefits in any form from a commercial party related directly or indirectly to the subject of this manuscript for any of the authors have been acknowledged. For each source of funds, both the research funder and the grant number have been given. The authors declare that they have no conflict of interest.
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Liu, TX., Irungu, R.W., Dean, D.A. et al. Impacts of spinosad and λ-cyhalothrin on spider communities in cabbage fields in south Texas. Ecotoxicology 22, 528–537 (2013). https://doi.org/10.1007/s10646-013-1045-1
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DOI: https://doi.org/10.1007/s10646-013-1045-1