Spider Populations in New Jersey Apple Orchards1

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Mean numbers of spiders in three unsprayed New Jersey apple orchards were higher than in seven sprayed orchards during 1957. "Hunting" spiders appeared to he more strongly affected by sprays than web-builders. Spiders formed a lower proportion of total predatory arthropods (excluding mites) in sprayed orchards than in unsprayed. A seasonal trend was noted in population density similar to that observed elsewhere. Eight species comprised about 87% of the individuals from .July to October in unsprayed orchards. These species made up only 60% of the individuals in sprayed orchards, thc difference being mainly owing to the relative abundance of the erigonid, Grammonota inornata Emerton. The 34 species found in the study are listed with annotations.

Document Type: Research Article

Publication date: October 1, 1960

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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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