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Growth rates and susceptibility of different larches (Larix spp.) to Pristiphora erichsonii (Hartig) were studied for 5 years in western Maryland when trees were 6 to 10 years old. Most rapidly growing were some geographic strains of L. leptolepis (Sieb. and Zucc.) Cordon L . decidua Miller, and their F2 hybrids, reaching heights ca. 20 ft in 10 years from seed. L. sibirica Ledeb., L. gmelini (Rupr.) Kuzeneva, and L. occidentalis Nutt. grew slower. Most susceptible to larch sawfly was L. x eurolepis Henry F2 followed by L. leptolepis, L. gmelini, and L. decidua; L. sibirica was less susceptible, and L. occidentalis most resistant. In L. leptolepis and L. decidua, some geographic strains were less susceptible than others. Among such less susceptible strains were L. leptolepis from the Okunikko region and L. decidua from the western Alps.
Document Type: Research Article
Publication date: October 1, 1976
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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.