NDLI: Susceptibility of Wolf Spider, Lycosa terrestris (Araneae: Lycosidae) to

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Susceptibility of Wolf Spider, Lycosa terrestris (Araneae: Lycosidae) to

Content Provider	CiteSeerX
Author	Mustafa, Ata Butt, Abida Muhammad, Hafiz Bilal, Muhammad
Abstract	Abstract.- The present study was designed to check the effect of chlorpyrifos (Lorsban) on Lycosa terrestris, the most dominant ground spider in the agroecosystem of Punjab, Pakistan. For this purpose topical and residual bioassay tests were performed. Probate analysis showed that this insecticide is highly toxic for both sexes. The calculated LD50 values were less than field dose. Results of residual bioassays showed that this insecticide is highly toxic to spiders even after one month of its exposure. Negative effects of this insecticide not only reduces the biological control potential of L. terrestris but also poses a serious threat to other natural predators of agroecosystems. Key words: Agroecosystem, residual toxicity, ground spiders. Spiders are the most abundant natural predators of insects in terrestrial ecosystems and consume large number of prey without damaging the plants (Lang et al., 1999; Hanna et al., 2003). Many studies have demonstrated that spiders can significantly reduce prey densities in agricultural fields (Symondson et al., 2002; Pearce and Zalucki, 2006; Schmidt et al., 2009). Agricultural fields that are frequently sprayed with pesticides often have low spider population (Amalin et al., 2000). Cyhexatin, flubenzimine, dicofol and azocyclotin) and chlorinated hydrocarbons (endosulfan) followd by pyrethroids, organophosphates and carbamates have been reported to be most toxic the hunting spiders and
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Subject Keyword	Lycosa Terrestris Wolf Spider Agricultural Field Calculated Ld50 Value Abundant Natural Predator Hunting Spider Natural Predator Many Study Field Dose Residual Bioassay Serious Threat Biological Control Potential Residual Toxicity Ground Spider Prey Density Negative Effect Residual Bioassay Test Dominant Ground Spider Terrestrial Ecosystem
Content Type	Text

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