Effect of Phloem Condition and Phloem Moisture on the Entry of Scolytus multistriatus123

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Abstract
Elm logs not previously infested remained attractive to S. multistriatus from a few hours to 8.5 months in the field. The pre-infestation period was extended to 10+ months by storing the logs at 60[degree]F and at 32[degree]F. The infestation period did not last longer than 9 weeks, while most of the beetle population was in the logs by the end of the 4th week after initial entry; a decline in entries generally began after the 2d week of entry. The rate at which the phloem died was correlated with beetle entry for egg laying. Beetles entered slow-dying phloem (logs cut in mid-July and later) for longer periods than rapidly-dying phloem (logs cut early in the season or during winter). There were no differences in the number of beetles entering phloem with a moisture range of 40-59% when live or decadent phloem was present. Logs with all the phloem dead longer than 4 weeks, but with the same moisture range as decadent logs, did not attract beetles. Hylurgopinus rufipes reacted similarly to S. multistriatus to live, decadent, and dead phloem.

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