/ 
LIBRARY 
STATE PLANT BOARD 
REPORT OF THE CHIEF OF THE BUREAU OF ENTO- 
MOLOGY AND PLANT QUARANTINE, 1939 
United States Department of Agriculture, 
Bureau of Entomology and Plant Quarantine, 
Washington, D. C, September 13, 1939. 
Hon. Henry A. Wallace, 
Secretary of Agriculture. 
Dear Mr. Secretary: I submit herewith a report of the work of 
the Bureau of Entomology and Plant Quarantine for the fiscal year 
ended June 30, 1939. 
Sincerely yours, 
Lee A. Strong, Chief. 
contents 
Page 
Introduction.. 1 
Publications and editorial work.. 2 
Library 2 
Insect pest survey and information 2 
Fruit insect investigations. . 3 
Fruitfly investigations..- 10 
Mexican fruitfly control 10 
Japanese beetle quarantine and control 12 
Control of peach mosaic and phony peach dis- 
eases 20 
Citrus canker eradication 21 
Insects affecting forest and shade trees 21 
Gypsy and brown-tail moth control 25 
Gypsy and brown-tail moth quarantine en- 
forcement. 32 
Dutch elm disease eradication 34 
White pine blister rust control 38 
Cereal and forage insect investigations 44 
White-fringed beetle control and eradication. 49 
Mormon cricket control 50 
Grasshopper control. 51 
Page 
European corn borer inspection and certifica- 
tion 52 
Barberry eradication 53 
Truck crop and garden insect investigations.. 58 
Sweetpotato weevil control and eradication... 67 
Cotton insect investigations 67 
Pink bollworm control 74 
Thurberia weevil control 80 
Bee culture 80 
Investigations of insects affecting man and 
animals 84 
Insect identification 88 
Foreign parasite introduction 89 
Control investigations 92 
Insecticide, investigations 95 
Transit inspection 100 
Convictions and penalties imposed for viola- 
tion of the Plant Quarantine Act 101 
Foreien-nlant quarantines 101 
Certification for export 117 
INTRODUCTION 
' ,6 
The organization of the Bureau activities remains practically un- 
changed. The eradication and control of plant pests have been con- 
tinued under a program expanded by allocations of emergency relief 
funds. There has been a curtailment in these operations as a result 
of reduced allotments. 
As the result of extensive experiments to determine the possibility 
of so treating fruit originating in countries in which fruit flies are 
known to occur as to insure that it be free from infestation, fruit 
from certain fruitfly-infested areas lias been admitted subject to 
sterilization by the time-temperature method. This method of treat- 
ment during the year was extended to cover the shipment of certain 
fruits and vegetables from Hawaii to the mainland. 
1 8S5D0— 40 1 
