Authors: Pitre, Henry N.; Thead, Larry G.; Hamer, Jim L.

Source: Journal of Economic Entomology, Volume 80, Number 4, August 1987 , pp. 848-853(6)

Publisher: Entomological Society of America

Abstract:

Calibration ratios (number per square meter absolute/number per square meter sweep net) were measured to estimate field populations (number per square meter) of 9 insect groups from sweep-net samples in narrow- (17.8 cm) and wide- (76.2 or 96.5 cm) row soybeans in 1983 and of 10 insect groups in narrow- (17.8 cm) row soybeans in 1984. Absolute populations were estimated with a cage-bag technique. Observations were made at R1 (beginning bloom), R3 (beginning pod), and R6 (full seed) plant stages at a North Mississippi location and at the R4 stage (beginning seed) at a South Mississippi location in 1983. Tests in North Mississippi were conducted on plant stages ranging from V7 to V11 (vegetative), R2 (full bloom), R4 (full pod), and R5 (beginning seed) in 1984. Row spacing had little effect on calibration ratios. Few calibration ratios significantly > 1.0 were observed in the 1983 and 1984 North Mississippi studies. This was probably because of low populations during sampling periods. The most consistent and reliable calibration ratios were calculated for Plathypena scabra (F.) and Anticarsia gemmatalis Hübner in tests with the highest insect populations in South Mississippi.

Document Type: Research article

Publication date: 1987-08-01

More about this publication?

• 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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