CATALO(;rK OF i-:xiiir.iTS of ixsfct enfmifs of 



FORFSTS AM) FORFST PRODIKTS AT THE 

 LOUISIANA PURCHASE EXPOSITION. 



INTRODUCTORY. 



The extent of depredations by insects on the principal kinds of 

 trees in ditferent sections of the country, the nia<(nitude of tlie prob- 

 lems demanding investigation, and the growing demand for informa- 

 tion on causes and remedies led to the establishment of a section of 

 the Division of Entomolog}' for forest-insect investigations, which 

 was organized on July 1, 1902. 



The object of this section is to conduct original research in the field 

 and la))oratory. to determine the principal insect enemies of forest 

 trees and forest products, and especialh' to determine facts relating to 

 life histories, habits, distribution, character of injury, and natural 

 enemies on which to base recommendations of methods for preventing 

 losses. 



Information acquired from observations by the author in all but one 

 State, relating to the character and extent of the work of insects which 

 are either detrimental or destructive to the forest resources and prod- 

 ucts of the country, leads him to estimate the average annual losses at 

 §100,000,000. This is based on late stumpage values and wholesale 

 prices of commercial products. 



CHARACTER OF THE EXHIBIT. 



The object of the exhibit is to show the character of work and 

 injury, the various kinds of insects which cause the injury, and also 

 the kinds which are beneticial on account of tlitir habits of preving 

 upon the injurious ones. 



The labels give brief information as to the connnon or Knglisji 

 names and technical or Latin names of insects, followed by brief 

 descriptions of the character of their work, habits, and distribution, 

 and the kinds of trees or wood injured. When the species is of special 

 importance, referrnce is madf to the i)riiiiip:il iJuMications «on<t'rniug 

 them. 



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