Microenvironmental Measurements for theDioryctria amatella-zimmermani Complex1 in Shortleaf Pine. 2. Cone Moisture Content, Cone Utilization, and Food Consumption2,3

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The microenvironmental conditions for existence of Dioryctria spp. in shortleaf pine 2nd-year cones were in- vestigated. The influence of moisture content of cones on diapausing and nondiapausing Dioryctria larvae was considered. Larvae occurred in 2nd-year cones which varied in water content from 15.6% to 78.9%. Diapausing larvae occurred in brown cones where the water content was low. Nondiapausing larvae were found in cones with a wide range of moisture conditions. Cones with high moisture content appeared to be preferred.

Diapause in Dioryclria larvae was thought to result from exposure to higher temperatures and greater water stress in the habitat where diapause was noted to occur.

Dioryctria spp. utilized approximately 40% by weight and 35% by volume of each 2nd-year cone. Each cone attacked was rendered useless for seed production purposes.

Colopterus truncalus Rand occurred in cones which varied greatly in water content.

Document Type: Research Article

Publication date: April 1, 1970

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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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