BIV. INSECTS. 



U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF ENTOMOLOGY— BULLETIN NO. 90, Part I. 



L. O. HOWARD, Entomologist and Chief of Bureau. 



HYDROCYANIC-ACID GAS FUMIGATION 

 IN CALIFORNIA. 



FUMIGATION OF CITRUS TREES. 



BY 



R. S. WOGLUM, M. S. A., 



Special Field Agent, Bureau of Entomology . 



Issued May 13, 1911. 



/ 



% £ A *\SS 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 

 1911. 



