pith fleck

pith fleck

A short dark streak in wood resembling pith, but caused by insect attack during growth.
References in periodicals archive ?
According to The Encyclopedia of Wood, "The larvae of burrowing insects create pith flecks, which show as irregular dark markings and local grain disturbance,"
The heartwood is pale-pink brown to a darker red brown, with narrow brown pith flecks.
The wood has narrow brown pith flecks and small gum pockets, a straight grain and a fine, even texture.