Prevention of Blue-stain in Unpeeled Scots Pine Logs: (With 2 Plates)

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Abstract
Blue-stain causes degrade of saw logs during the inevitable delays between felling and conversion. Chemicals of potential value in blue-stain control have been tested in the laboratory and trials have been made of their use on unpeeled logs stored in the forest. End treatments with fungicides were not very effective during summer storage of logs. Whole log treatments with a combined fungicide and insecticide containing 2 per cent. Santobrite, 2 per cent. borax, and 0·75 per cent. γ BHC gave very good protection for 3 months. End treatment with fungicides followed by whole-log treatment with insecticides was also effective. Protection by either method of treatment was lessened during longer storage periods especially in the warmer months of the year. Whole-log treatment with insecticide alone gave a good measure of control of stain. Short delays after felling before the application of whole-log treatments may be acceptable especially on logs which have previously received end treatments. Attack by bark-boring insects must be controlled if effective all-the-year protection against blue-stain is required. Insect attack appears to be secondary only to time of felling in relation to incidence of blue-stain. The value of winter felling has been confirmed.

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