Development of the Gypsy Moth (Lepidoptera: Lymantriidae) on Douglas-fir Foliage

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Survival of larvae, developmental time, consumption, live weights, £rassproduction, pupal weights, and adult female ova production of the gypsy moth, Lymantria dispar (L.), were monitored in the laboratory for a comparison of performance between a standard synthetic diet and Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco. Gypsy moth survival (96%),larval development (40 and 34 d at 22ºCfor females and males, respectively), and pupal weight (1,845 mg and 560 mg for females and males, respectively) on the standard synthetic diet were very similar to data found in the literature regarding highly suitable diets. However, performance of the gypsy moth on Douglas-fir was indicative of a suboptimal host. Survival of first instars on Douglas-fir ranged from 0 to 84%, depending upon temperature and foliage age. Development from first instar eclosion to pupation averaged 44.0 d (males) and 58.3 d (females) at 22ºC.Male and female larvae consumed an average of 2,040.6 mg and 6,136.1 mg dry weight of foliage, respectively. Frass production averaged 1,277.9 mg (males) and 3,526.7 mg (females) dry.weight. Values were low for nutritional indices of efficiency of conversion of ingested food (4.5-4.9%) and efficiency of conversion of digested food (11.4-12.1%). Live pupal weights averaged 424.2 mg (male) and 1,249.8mg (female). Females produced an average of 615.7ova.The highest correlations among the developmental parameters were between pupal weight: frass production and pupal weight: ova production.

Document Type: Research Article

Publication date: April 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.
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