. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Fig. S3.—Holes made by the bander! ash borei (Xeoclytus capraea), one of the powder-post beetles the pores or tne wood, any substances that will close the pores will prevent oviposi- tion in wood not pre- viously infested. In wood from which bee- tles have emerged, however, eggs might be laid within the exit holes. Paraffin wax. varnish, linseed oil. or other fillers effectively close the pores of wood. A certain var- nish known as hard- ened gloss oil is com- monly used. Wood that lias been sea- soned less than 8 to 1
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Fig. S3.—Holes made by the bander! ash borei (Xeoclytus capraea), one of the powder-post beetles the pores or tne wood, any substances that will close the pores will prevent oviposi- tion in wood not pre- viously infested. In wood from which bee- tles have emerged, however, eggs might be laid within the exit holes. Paraffin wax. varnish, linseed oil. or other fillers effectively close the pores of wood. A certain var- nish known as hard- ened gloss oil is com- monly used. Wood that lias been sea- soned less than 8 to 10 months will not be attacked by Lyctus beetles; therefore, in applying chemical preventives, only sap- wood that has been seasoned for 8 to 10 months and longer need be treated. The seasonal history of these beetles indicates that preventives should be applied be- fore March 1. The great and re- curring expense of treating infested wood can be avoided by prevention of attack by proper methods of management. Since only the sapwood or whitewood is attacked by Lyctus powder-post beetles, it is recom- mended that more heartwood be used to replace sapwood. Although the demand of the trade is for white- wood handles, etc., the prejudice against heartwood is not warranted. Fig. 34.—Powder-posted ash shipbuilding lumber, show- ing coarse powdery frass iu the burrows cnadr l>y Neoclytus capraea. 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. ?] : The Dept. : Supt. of Docs. , G. P. O.
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