REPORT OF THE ENTOMOLOGIST. 



United States Department of Agriculture, 



Bureau of Entomology, 

 Washington, D. C, August 22, 1922. 

 Sir: I submit herewith a report of the work of the Bureau of 

 EntomolotTA' for the fiscal year ended June 30, 1922. 



L. O. Howard. 

 Entomologist and Chief of Bureau. 

 Hon. Henry C. Wallace, 



f^ecretary of Agriculture. 



DECIDUOUS-FRUIT INSECT INVESTIGATIONS. 



InA'estigations of deciduous-fruit insects have been carried out 

 under the direction of Dr. A. L. Quaintance as formerh^ 



The Japanese beetle. — Work against the Japanese beetle has 

 been prosecuted as heretofore in cooperation with the New Jersey 

 and Pennsylvania State Departments of Agriculture. Much addi- 

 tional information concerning the life history, habits, and injurious 

 character of the pest has been obtained in the several lines of work, 

 but it has been spreading and threatens to become a pest of first-class 

 and widespread importance. 



The Federal Quarantine No. 48, the New Jersey State quarantine, 

 and the Pennsylvania State quarantine have been in effect, the 

 State quarantines supplementing the Federal quarantine for intra- 

 state traffic. As heretofore, the enforcement of State quarantines 

 has been delegated to bureau authorities, who cooperate with the 

 Federal Horticultural Board. Special attention has been given to 

 the inspection and certification of vegetable products. During the 

 season of 1921 some 205,498 baskets of sweet corn were inspected and 

 more than 5.000 beetles were removed from within the tips of the 

 corn during this inspection. This is a marked increase over inspec- 

 tion work done during the previous year and also in the number of 

 beetles found. 



Scouting to determine the limits of infestation was carried on 

 throughout the summer of 1921. involving some 400 square miles, 

 with the result that approximately 213 square miles in New Jersey 

 and approximately 57 square miles in Pennsylvania were found to 

 be infested. 



In the investigational work on the Japanese beetle, studies of 

 arsenical insecticides have been continued. Although it has been 

 repeatedly demonstrated in the course of the Avork that ordinary 

 arsenical sprays are not effective against the beetles at the strengths 



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