. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Contribution from the Bureau of Entomology L. O. HOWARD, Chief Washington, D. June 9,1919 PROTECTION FROM THE LOCUST BORER. By F. C. Craighead, Specialist in Fairest Entomology, Forest Insect Investigations. CONTENTS. Page. Introduction Historical Observations by tbe writer Investigations and experiments Natural growth in the vicinity of Falls Church, Va Plantations along the Pennsyl- vania Railroad Condition of tree necessary for borer attack Page. How to recognize trees containing no borer defects 9 Character of
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Contribution from the Bureau of Entomology L. O. HOWARD, Chief Washington, D. June 9,1919 PROTECTION FROM THE LOCUST BORER. By F. C. Craighead, Specialist in Fairest Entomology, Forest Insect Investigations. CONTENTS. Page. Introduction Historical Observations by tbe writer Investigations and experiments Natural growth in the vicinity of Falls Church, Va Plantations along the Pennsyl- vania Railroad Condition of tree necessary for borer attack Page. How to recognize trees containing no borer defects 9 Character of growth of uninfested stands . 9 Conditions under which locust can be grown 10 Control 11 A method of handling severely damaged plantations 11 Treatment of shade trees 11 Literature cited 12 INTRODUCTION. The increasing value of black or yellow locust* for many pur- poses, and. especially the recent demand, for sound locust pins or tree- nails in the construction of wooden ships, render its protection from insect damage important. In addition to the natural growth of locust in forests, farmers' woodlots, and abandoned fields, many attempts have been made to grow it on a commercial scale in plantations. These attempts in most cases have resulted in failure, owing to the serious damage to the wood and frequently the destruction of the trees caused by the locust borer.^ The fact, however, that in natural growth and occasional plantations practically no injuries from the borer are found, while in other cases the trees are ruined for commercial purposes or killed outright, has led the writer to make a thorough investigation of the problem to ascertain the cause of the occasional immunity from borer injury. As a result of these investigations, it appears practically certain that plantations of this tree can he protected swccessfuUy from ^ RoMnia pseudacacia L. 106358°—19 ^ Cyllene roMniae Please note that these images are extracted from scanned page images that may have bee
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