Prepupal and Pupal Parasitism of Helicoverpa zea and Spodoptera frugiperda (Lepidoptera: Noctuidae) by Steinernema sp. in Cornfields in the Lower Rio Grande Valley


Source: Journal of Economic Entomology, Volume 85, Number 5, October 1992 , pp. 1666-1670(5)

Publisher: Entomological Society of America

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An indigenous Steinernema sp. (Rhabditida: Steinernematidae) nematode parasitized prepupae and pupae of corn earworm, Helicoverpa zea (Boddie), and fall armyworm, Spodoptera frugiperda (J. E. Smith), collected from fruiting cornfields in the Lower Rio Grande Valley of Texas and northern Tamaulipas, Mexico. Over a 5-yr period, 34% of all fields sampled contained parasitized corn earworm and 24.2% contained parasitized fall annyworm. Of 3,036 corn earwonn prepupae and pupae collected during this study, 11.6% were parasitized; of 1,802 fall armYW0l111collected, 9.3% were parasitized. Parasitism by Steinernema sp. accounted for 49.4 and 46.1% of the mortality of corn earworm and fall armyworm prepupae and pupae, respectively.

Document Type: Research Article

Publication date: October 1, 1992

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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