Authors: Lentz, Gary L.; Pedigo, Larry P.

Source: Journal of Economic Entomology, Volume 68, Number 3, June 1975 , pp. 301-304(4)

Publisher: Entomological Society of America

Abstract:

Extensive and intensive sampling programs were conducted in 1970 and 1971 in alfalfa and soybean ecosystems to determine the relative abundance of green cloverworm larvae, Plathypena scabra (F.), in various areas of Iowa and also to collect and identify green cloverworm parasites and to determine their distribution, abundance, seasonal occurrence, and host-parasite relationships. Ten species of primary parasites were reared, 5 of which are reported as parasites of the green cloverworm for the 1st time. Total parasitism by all species in the 2-year study was 31.8%. The most abundant parasite, Rogas nolophanae Ashmead, was reared from 17.8% of all larvae collected in 2 years. Early season parasitism by R. nolophanae was high but declined sharply at midseason. Little difference was noted in total parasitism by R. nolophanae in the 2 ecosystems. The 2nd most abundant parasite, Winthemia sinuata Reinhard, was reared from 8.6% of all larvae collected. Percentage parasitism by W. sinuata was low early in the season but increased later. Parasitism by W. sinuata was 3.9 and 10.0% in alfalfa and soybeans, respectively. In the weekly intensive study, total parasitism by each of 6 of the primary parasites was less than 1.5%. Hymenopterous parasites reared had solitary development and the dipterous parasites usually had solitary development. The single egg parasite, Telenomus sp., is a new record. Other mortality factors noted were mermithid nematodes and a granulosis virus.

Document Type: Research article

Publication date: 1975-06-01

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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