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6 Wood Discoloration

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7.4 Protection 159<br />

is a mixture of phenolics extracted from the shells of the cashew nut, reduced<br />

growth of some decay fungi (Pelayo et al. 2000). Venmalar and Nagaveni (2005)<br />

tested copperised CNSL and neem (Azadirachta indica) seed oil, containing<br />

azadirachtin, as preservatives. Alcoholic neem leaves extracts decreased wood<br />

mass loss by Oligoporus placenta and Trametes versicolor (Dhyani et al. 2005).<br />

Recent research on the various aspects of modified wood was compiled at<br />

the Second European Conference on <strong>Wood</strong> Modification (2005).<br />

There were (and are) many attempts at biological wood protection. To<br />

date, the application of microbiological control to prevent wood decay and<br />

discoloration has been successful in the laboratory, but inconsistent in its performance<br />

in the field (reviews by Bruce 1998; Bjurman et al. 1998; Chap. 3.8.1).<br />

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