MASSACHUSETTS 

 AGRICULTURAL EXPERIMENT STATION 



BULI ETIN NO. 303 DECEMBER. 1933 



Effect of Hydrocyanic Acid Gas on 



Cucumber Plants Previously 



Sprayed with Copper Fungicides 



By E. F. Cuba and E. B. Holland 



The control of fungous diseases and insect pests of cucumbers in green- 

 houses frequently requires the use of copper fungicides and hydrocyanic acid 

 gas. Complete destruction of greenhouse cucumber plantings has occurred in 

 Massachusetts in some instances from such treatment. This study was under- 

 taken to determine the nature and the range of this incompatibility and to formu- 

 late a safe procedure. 



MASSACHUSETTS STATE COLLEGE 

 AMHERST, MASS. 



