AMERICAN FORESTRY 



1243 



PROTECTgLOCUST TREES FROM 

 BORERS 



PLANTATIONS of the locust tree can be 

 successfully protected from the borer 

 and grown profitably on a commercial scale 

 if the trees are planted in thick stands or 

 mixed with other trees, so as to produce a 

 densely shaded condition during the first 

 ten to fifteen years. Investigations of the 

 United States Department of Agriculture 

 showed that more trees were destroyed by 

 borers in tracts which had been pruned 

 occasionally, or closely grazed, or in which 

 fire had killed out the underbrush, thus 

 destroying the natural shade produced by 

 weeds and shrubbery. 



The denser the underbrush about the 

 trunks of the trees the less is the damage 

 done by borers. Trees growing from two 

 to three feet apart were seldom injured, 

 while nearby isolated trees were riddled 

 by borers. 



Condition Necessary for Borer Attack 

 All trees and all parts of the tree are not 

 subject in the same degree to attack by 

 the borer. Rough bark provides crevices 

 in which the borers deposit their eggs. 

 Young trees, less than one and one-half to 

 two inches at the base, are not attacked 

 unless the bark is rough. On younger trees 

 the borers are found at the base and near 

 rough crotches. Trees with trunks more 

 than five or six inches in diameter rarely 

 contain the insects. On such trees the 

 larger branches frequently are infested, but. 

 such injury is seldom common enough to 

 do much harm. Protection from borers is 

 necessary for only a comparatively short 

 period during the tree's growth. Under 

 good growing conditions this time should 

 not exceed ten years. 



Treatment , of Shade Trees 

 The locust is widely planted for orna- 

 mental and shade purposes. It is highly 

 desirable, because it grows readily in a 

 variety of soils and situations. It grows 

 rapidly and forms a shapely crown when 

 planted in the open. But it is frequently 

 attacked by borers. This is because shade 

 trees are planted singly and in the open, 

 thus furnishing favorable conditions for 

 attack. 



Young borers can be killed readily by the 

 use of an arsenical spray. Spraying will 

 be necessary only every two or three years, 

 unless badly infested trees nearby are not 

 treated. As a rule, spraying will not be 

 needed after trees reach six inches in diam- 

 eter. Trees of that size are usually im- 

 mune from attack, but should be watched. 

 Locusts make such desirable shade trees 

 that they should not be neglected and al- 

 lowed to become injured or destroyed by 

 borers. The increasing value of black or 

 yellow locust for many purposes makes it 

 a profitable tree to grow commercially and 

 emphasizes the importance of protecting it 

 from the borer. Information concerning 

 the care of both shade trees and commer- 

 cial plantings of locust is included in Bul- 

 letin 787, issued by the United States De- 

 partment of Agriculture, Washington, D. C. 



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ADVISORY BOARD 



Representing Organizations Affiliated with the 

 American Forestry Association 



National Wholesale Lumber Dealers' Association Lumbermen's Exchange Empire State Forest Products Association 



JOHN M. WOODS, Boston. Mass. J. RANDALL WILLIAMS, JR., Philadelphia, Pa. FERRIS J. MEIGS, New York Citj 



W. CLYDE SYKES, Conifer, N. Y. FREDERICK S. UNDERBILL, Philadelphia, Pa.RUFUS L. SISSON, Potsdam, N. Y. 



R. G. BROWNELL, Williamsport, Pa. R. B. RAYNER, Philadelphia, Pa. W. L. SYKES, Utica, N. Y. 



Northern Pine Manufacturers' Association 



C. A. SMITH, Coos Bay, Ore. 



WILLIAM IRVINE, Chippewa Falls, Wia. 



F. E. WEYERHAEUSER, St. Paul, Minn. 



National Association of Box Manufacturer! 

 B. W. PORTER, Greenfield, Mass. 

 S. B. ANDERSON, Memphis, Tenn. 

 ROBT. A. JOHNSON, Minneapolis, Minn. 



Carriage Builders' National Association 



H. C. McLEAR, Mount Vernon, N. Y. 



D. T. WILSON, New York 



P. S. EBRENZ, St. Louis, Missouri 



New Hampshire Timberland Owners' 

 W. H. BUNDY, Boston. Mass. 

 EVERETT E. AMEY, Portland, Me. 

 F. H. BILLARD, Berlin, N. H. 



Massachusetts Forestry Association 

 NATHANIEL T. KIDDER, Milton, Maas. 

 FREDERIC J. CAULKINS, Boston, Mass. 

 HARRIS A. REYNOLDS, Cambridge, Mass. 



California Forest Protective Association 

 MILES STANDISH, San Francisco, Cal. 

 Aeaociatlon GEO x WENDLING, San Francisco, Cal. 

 GEO. H. RHODES, San Francisco, Cal. 



Minnesota Forestry Association 

 W. T. COX, St. Paul, Minn. 

 PROF. D. LANGE, St. Paul, Minn. 

 MRS. CARRIE BACKUS, St. Paul, Minn. 



American Wood Preservers' Association 

 MR. CARD, 111 W. Washington St., Chicago, 111. 

 MR. JOYCE, 332 S. Michigan Ave., Chicago, 111. 

 F. J. ANGIER, Baltimore, Md. 



Camp Fire Club of America Southern Pine Association 



Philadelphia Wholesale Lumber Dealers' Ass'n w i L LIAM B. GREELEY, Washington, D. C. J. B. WHITE, Kansas Citj, Mo. 



J. RANDALL WILLIAMS, JR., Philadelphia, Pa O. H. VAN NORDEN, New York T. E. RHODES, New Orleans, La. 

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FRED'K S. UNDERHILL, Philadelphia, Pa. FREDERICK K. VREELAND, New York 



HENRY E. HARDTNER, Urania, La. 



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