260 EXPERIMENT STATION RECORD. 



Insecticide materials and spraying apparatus: Addresses of dealers and 

 manufacturers, W. E. IIinhs {^AIhIxuiki Cal. ,s'/a. Cirr. 3, pp. .'i). — Address lists 

 of some of tlio lirius nmnufacturins or dcaliiifj in insecticide materials and 

 apparatus are .irivcii. 



Some insects injurious to forests. — Insect depredations in North American 

 forests and practical methods of prevention and control, A. D. Hopkins 

 (U. S. Dipt. Agr., Bur. Ent. Bui. 58, pt. 5, pp. 57-101). — The author here gives 

 a summary of facts, conclusions, and estimates relating to the forest-insect prob- 

 lem as applieil to North American conditions and calls attention to its inij)or- 

 lance in the future maiiagoinout of private and public forests. 



In the first part of the paper (pp. 57-71) insect depredations in North Amer- 

 ican forests are considered, their character and extent being discussed at some 

 length. The methods of prevention and control are then taken up (pp. 71-!tl), 

 followed by general conclusions. It is stated to be evident that if the informa- 

 tion now available is properly utilized in the future it will result in the pre- 

 vention of an equivalent of at least 30 per cent of the estimated annual waste 

 of forest resources that has been caused by insects within recent years. Meth- 

 ods by whicli this can be accomplished have been summarized as follows : 



" The adoption or adjustment of certain requisite details in forest manage- 

 ment, in lumbering and manufacturing operations, and in storing, transporting, 

 and utilizing the products which, at the least expense, will bring about the 

 necessary reduction of the injurious insect and unfavorable conditions for their 

 future multiplication or destructive work. 



" The adoption of policies of control, based upon expert technical knowledge 

 or advice relating to the species, habits, life history, and natural enemies of the 

 insects involved, and methods for their control, supplemented by expert knowl- 

 edge or advice on the principles of technical and applied forestry in the proper 

 management, care, and utilization of the forest and its resources and still fur- 

 ther supplemented by practical knowledge and exi)erience relating to local con- 

 ditions and facilities favorable and unfavorable for successful application 

 according to a given method or policy of control. . . . 



" Utilization of so-called matured timber, and especially dense or pure stands 

 of such timber, thus removing one of the favorable conditions for rapid deterio- 

 ration through attacks by wood-boring insects or death through the attack of 

 destructive bark-boring or defoliating insects. 



" The utilization of a knowledge of the principles of natural conti'ol as a 

 means of contriltuting to the efficiency of artificial control. 



" Prompt recognition of the first evidences of the work or destructive out- 

 breaks of the principal insect dej^redators, authentic identification of the species 

 involved, and prompt action in adopting the proper method or methods of con- 

 trol for the prevention of losses." 



Attention is called to the fact that it is useless to attempt the extermination 

 of an insect enemy of the forest or its products. It is only necessary to reduce 

 and weaken its forces at least 75 per cent, so that it can not continue an ag- 

 gressive invasion, but must occupy a defensive position against its own enemies 

 and become dependent upon favorable conditions resulting from avoidable neg- 

 ligence and mismanagement by the owners of the forests and the manufacturers 

 of forest products. 



An extensive list of publications relating to forest insec-ts and to forest sta- 

 tistics is appended. 



Some insects injurious to forests. — The southern pine sawyer, J. L. Webb 

 {U. S. Dept. Agr., Bur. Ent. Bui. 58, pt. Jf, pp. Jtl-56, figs. 12). — An account of 

 Monohammus titillator, its injury and remedial measures based on investiga- 

 tions conducted in Mississippi, Louisiana, and Ai-kansas. 



