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Geocoris spp. (Hemiptera: Lygaeidae) and the Striped Lynx Spider (Araneae: Oxyopidae): Cross Predation and Prey Preferences

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Laboratory studies investigated cross predation between Geocoris spp. and Oxyopes salticus Hentz and prey preferences of these two species. Geocorid adults consumed all eggs or emerging spiderlings from a single O. salticus egg sac if the mother spider was excluded, but they preferred Heliothis zea (Boddie) eggs in a two-choice bioassay; H. zea eggs or first instars were consumed over O. salticus juveniles (first to third instar) or third-instar geocorids. Geocoris spp. adults successfully attacked first- to third-instar spiders occasionally but did not cannibalize third-instr geocorids. Adult O. salticus females fed upon geocorid third instars and adults and first- to third-instar O. salticus at a rate of 1-2 per 24 h. Adult female O. salticus showed no significant preference for second-instar H. zea over first- to third-instar O. salticus or geocorids (nymphs or adults) but tended to take the more active prey. The results suggest that inundation of fields with Geocoris spp. is unlikely to reduce O. salticus populations, but predation by an increased O. salticus population could decrease geocorid populations.

Document Type: Research Article

Publication date: August 1, 1989

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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