Abstract
The microenvironmental conditions for existence of Dioryctria spp. in shortleaf pine 2nd-year cones were investigated. 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 truncatus Rand occurred in cones which varied greatly in water content.
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