Abstract
We evaluated the interactive effects of light intensity and aspect of small ponderosa pine, Pinus ponderosa Douglas ex Lawson, logs on the performance of pine engraver, Ips pini (Say). Low, moderate, and high light intensity (21,000, 47,000, and 67,000 lux, respectively), and top and bottom aspects of logs were crossed in a factorial experiment replicated in 4 blocks of previously thinned pole-size ponderosa pine. Logs exposed at high natural light intensity were attacked less than logs exposed at low to moderate sunlight. Insects attacking logs exposed to high light intensity exploited the subcortical environment scantily, which led to a low net brood production. Moisture content of phloem was positively correlated with brood production. However, the highest moisture content promoted interspecific competition from other wood borers, which resulted in low net brood production when moisture content of the phloem was high.
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