. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 28 BULLETIN 1 ; . MKNT IKK beartwood of both hardwoods and Boftwoods, from which the powder will fall when moved or The interior is honeycombed by gular burrows made by tin- larvae and when badly damaged i> converted into a maâ <<i closely packed material. which readily crumbles into fine flourlike powder r coarser pellets ⢠⢠ted 1. This is held together by an outer thin shell and intervening fib sound wood. These defects will be -â¢â¢â I in tin- order of the t In- holes 1 by the various types f A
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 28 BULLETIN 1 ; . MKNT IKK beartwood of both hardwoods and Boftwoods, from which the powder will fall when moved or The interior is honeycombed by gular burrows made by tin- larvae and when badly damaged i> converted into a maâ <<i closely packed material. which readily crumbles into fine flourlike powder r coarser pellets ⢠⢠ted 1. This is held together by an outer thin shell and intervening fib sound wood. These defects will be -â¢â¢â I in tin- order of the t In- holes 1 by the various types f All powder-post h. hickory, and oak. are princi- pally affected: but other hardwoods, such as walnut, maple, persim- mon, cherry, elm. poplar, and sycamore, are also damaged. Seasoned shipbuilding and airplane lumber and gunstock blank-, stored in large quantities, and finished stores, such as wheelbarrows, tent poles, oars, airplane parts, shovel and pick handles, and many other hardwood articles used in the military services are subject to serious damage by powder-post beetles. [Fig. 28. > Hickory, ash. and oak furniture, interior woodwork of buildings (fig. 29). and the woodwork of farming machinery and implement handles: ladder stock, such as rungs: vehicle stock, such as hubs. spokes, felloes, rims, singletrees, poles, and -hafts: and cooperate stock (barrel-stave bolts) are also Xyhtinu* l>:itatus â Insets -which have this peculiar habit of redaeboe wood fiber to a powderlike con- dition belong chiefly to the families Lyctidae. Ptinidae. Anobiidae. Bostrichidae. and Cerambycidae. By far the larger part of the injury is caused by species of the genera Lyctus and Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?
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