Abstract
Mean numbers of spiders in three unsprayed New Jersey apple orchards were higher than in seven sprayed orchards during 1957. “Hunting” spiders appeared to be 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, the 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.
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