The influence of soybean planting date and row width on seasonal abundance of velvetbean caterpillars, Anticarsia gemmatalts Hiibner, and southern green stink bugs, Nezara viridula (L.), was examined in large field plots during 1987-1988. Late-season populations of velvet bean caterpillars were more abundant in 'Braxton' soybeans planted in early June than in early May. They also were more numerous in narrow rows (45 cm) than in wide rows (90 cm), regardless of velvet bean caterpillar population density or sampling date. Southern green stink bugs were more numerous from July to mid-August in soybeans planted in early May than in soybeans planted in mid-Mayor early June. In late September to mid- October, when peak numbers were observed, there were more stink bugs in the narrow-row plantings than in the wide-row plantings. Several planting date, row spacing, and sampling date interactions were noted and are discussed. The canopy closure index (space left open between rows) was higher in the later plantings and wide rows, whereas plant height was higher in the earlier plantings and about the same for both row widths. Plot yields varied among planting dates between years but were higher in narrow rows both years.
Document Type: Research Article
Publication date: February 1, 1991
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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.