Notes on the Biology of NeodiPrion excitans1,2 in North Carolina

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A field study was made of a pine sawfly, Neodiprion excitans (Rohwer), which attacked 3000 acres of pond pine. Pinus serotina Michx., and loblolly pine, Pinus taeda I... in Pasquotank County, N. C., in 1968. Collections and observations of the insect were made weekly. The sawfly overwintered in the egg stage. Average egg size was 1.3X 0.5 mm, and dissection of virgin females revealed an average of all eggs. Typically, the female deposits 1 egg per needle.

Cocoon color varied ,with humidity. and cocoons under high humidities were darker. Average dimensions of all sample cocoons were 3.2X7.5 mm. Average dimensions of female and male cocoons were 9.2X3.8 mm anti 6.7X2.9 mm, respectively.

There were 2 generations per year, and the 2nd generation diapaused until November when the adults emerged and began oviposition.

Some tree mortality was noted during the outbreak, but this was probably due in part to recent site disturbance and other insects.

Document Type: Research Article

Publication date: June 1, 1972

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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.
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