Abstract
Data are presented from unreplicated Scots pine { Pinus sylvestris L.) sample plots in Thetford Forest which have been differentially attacked by Fomes annosus (Fr.) Cooke. Volume production of severely infested crops differs markedly from that forecast by management tables. The volume of dead trees may not represent the total loss of volume in these plots as there appears also to be a reduction in the growth of the remaining live trees. These observations may have considerable significance in forecasting future volume production from stands attacked by F. annosus and also in deciding the optimum time for their replacement.

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