UNITED STATES DEPARTMENT OF AGRICULTURE 
BULLETIN No. 907 
Contribution from the Bureau of Entomology 
L. O. HOWARD, Chief 
Washington, D. C. PROFESSIONAL PAPER October 20, 1920 
FUMIGATION OF CITRUS PLANTS WITH 
HYDROCYANIC ACID: 
CONDITIONS INFLUENCING INJURY 
By 
R. S. WOGLUM, Entomologist, Tropical and Subtropical 
Fruit Insect Investigations 
CONTENTS 
Page 
Introduction. . ‘ - A - ~ - 4 A ° = 1 
The Effect of Fisticoctanie Acid on ( Playite ‘ A 2 3 P| : 2 ~ 5 A 2 
Details of Experiments . ‘ = 3 
The Effect on Plant Injury of Temperature, ERE. Aaa Moisture afore Fumigation i 4 
The Effect on Plant Injury of Temperature, Light, and Moisture after Fumigation . 10 
_ The Effect on Plant Injury of Temperature, Light, and Moisture during Fumigation . 22 
General Discussion of Factors which Influence Fumigation Injury 2 A - A 27 
The Concentration of the Gas “ : é 5 = - = Z = = F = 28 
The Length of Exposure . - - : = - = - - - “ 29 
The Physiological Condition of ihe Plant ‘ “ : : : : : 2 30 
Atmospheric and Light Condiious 5 “ i. . Z c A z - S 33 
RS IETURIEAE Rt whe (rail! Tis: 5 Sa act Pree SINE DRED fat cy te it eam ae ic eRe SEN ag 
Literature Cited 3 a ee ae AE Da EME HR Pr eT A NRE DS RS aN 7 Oa. 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1920 
