Archive image from page 10 of Defects in timber caused by. Defects in timber caused by insects defectsintimberc1490snyd Year: 1927 DEFECTS IN TIMBER CAUSED BY INSECTS 9 The larvae of some types of ambrosia beetles excavate side gal- leries at right angles to the gallery made by the adult, which tun- nels into the wood to deposit eggs; other types excavate no side galleries. Some holes are clear; others are stained black by the action of fungi, some of which the beetles cultivate for food in their Fig. 7.—Pinholes caused by ambrosia beetles in heading and tight cooperage in South Carolina

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