354 



iSTATE BOARD OF AGRICULTURE 



Time and Nuinber of Applications 



The first spray application should be made when the plants are about four 

 inches high. Other applications should follow at intervals of approximately 

 ten days or two weeks throughout the growing season. The frequency of 

 the applications will be determined largely by weather conditions and by 

 the prevalence of injurious insects. In rainy seasons it may be necessary to 

 spray more often than at the intervals mentioned, since the bordeaux mixture 

 may be washed off the leaves by frequent rains; also, the late blight disease 

 is more likely to develop during periods of wet, muggy weather. Serious 

 outbreaks of insects would also warrant more frequent applications. 



Usually at least five applications will be required to control insect pests and 

 fungous diseases. 



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Fig. 16. 



Spraying should be continued late in the season. 



of the machine. 



Very little injury is done by the wheels 



Spraying Machine Essentials 



The spray machine used should be capable of maintaining a pressure of at 

 least 170 pounds, so that the spray material will be thrown from the nozzles 

 in the form of a dense mist. When the plants get large, approximately 100 

 gallons of spray material will be required to the acre. When the plants are 

 small, 50 gallons or so will be sufficient. The machine should be equipped 

 with two or three nozzles to the row, placed so that the spray will reach both 

 the under and upper surfaces of the leaves. It is very essential that the 

 lower surfaces of the leaves be protected with the spray, since most insects 

 and fungous diseases begin their attacks on the under sides of the leaves. 



The machine must have an efficient mechanical agitator, which will keep 

 the spray mixture thoroughly stirred. 



