This difference in repellency is likely to have been a consequence ofrapid degradation ofTP-40 from siding (49% in 3 days) and the fact that woodpeckers do not ingest wood, which minimized their exposure to TP-40. We conclude that TP-40 deters woodpeckers from food but does not reduce woodpecker damage to wood siding.
Also, 5 of 10 buildings treated with TP-40 received woodpecker damage in areas treated previously. By contrast, damage (primarily by downy woodpeckers) to wood siding on untreated and TP-40-treated boxes was similar ( P 0.32) in both years. Suet-eating birds, primarily downy woodpeckers ( Picoides pubescens Linnaeus), were repelled ( P < 0.01) by treated suet at all concentrations compared with untreated suet. We also applied TP-40 to woodpecker-damaged wood siding of 14 residential buildings during 1994- 1996. We then placed 10 (1995) and four (1996) pairs (1 each TP-40-treated and control) of boxes with wood siding containing untreated suet at seven and four sites with known woodpecker activity for 2- 3 weeks to assess damage to the siding. During December 1993- February 1994 we conducted three 2-week trials at four sites using six pairs of feeders containing untreated or TP-40- treated suet (5. We evaluated the effectiveness of ReJex-iTTM TP-40, containing 40% methyl anthranilate (MA) for deterring woodpeckers from food and from damaging wood sidings of buildings.
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