292 



STATE BOARD OF AGRICULTURE. 



As the character of the weather for a given season cannot be foretold, 

 it is impossible to prescribe any definite number of applications that 

 should be given the potato for the control of this disease. All applica- 

 tions are designed to prevent rather than cure the disease; hence, if 

 delayed too long, the desired results cannot be obtained. 



Fig. 8. Gas-Power Spraying Outfit. 



Under ordinary conditions one or even two applications of Bor- 

 deaux mixture with an arsenite can be used with profit. They should 

 Ibe used when the beetles become troublesome and when the first indica- 

 tion of early blight appears. Except in sections where true blight and 

 rot have been quite troublesome it may not be advisable to make other 

 ■ applications unless the climatic conditions are favorable for the develop- 

 ment of the rot. If, however, the weather during the first half of Au- 

 .gust is wet and muggy, it will be a good plan to thoroughly spray the 

 vines, and this treatment should be repeated at intervals of ten days 

 to two weeks, provided the weather for the remainder of the month 

 favors the appearance of the blight. 



