INSECTS OF ECONOMIC 

 IMPORTANCE 



The science of economic entomology has made 

 rapid progress during the last twenty years. It has 

 advanced astonishingly in the number of persons 

 engaged in the study of insects for the purpose of 

 preventing their ravages, in developing and per- 

 fecting mixtures for repelling and killing insects, in 

 devising effective apparatus for applying insecti- 

 cides, and in determining more exact methods of 

 preventing the losses caused by these persistent 

 pests. The following outlines of lectures are in- 

 tended to cover, as far as is possible in a brief, gen- 

 eral course, the different phases of the subject of 

 economic entomology as it exists to-day. 



OBJECTS OF THE COURSE 



(a) To become acquainted with the common in- 

 sect pests and with their habits and life histories in 

 order that they may be fought intelligently. 



(b) To become acquainted with the modern and 

 most practical methods of fighting insect pests. 



TWO PHASES OF ENTOMOLOGY 



(a) The pure science of entomology. 



(b) The economic or science applied of ento- 

 mology. 



The pure science of entomology is a study of the 

 kinds of insects together with their relationships to 



