POTATO SPRAYING AND DUSTING. 



5 



difficulty was experienced that eventually it was decided at Elmer and Freehold to 

 apply the lead arsenate wet, at the rate of six pounds per one hundred gallons. 



In all cases the application of the sulphur mixtures was successfully undertaken, 

 except at Freehold, where no treatment was made for the first spraying, and for the 

 second a mixture of hydrated lime and lead arsenate was used in dry form in the 

 proportion of 69 lb. of the former to 31 lb. of the latter. 



Fig. 1. The Watson Sprayer. 



Comment must be made on the fact that the potato dusting machine did not give 

 complete satisfaction, but this was partly due to the materials, wliich frequently 

 cohered to such an extent within the delivery pipes that blocking ensued. It was 

 for this reason mainly that the lead arsenate was apphed wet ; otherwise a great deal 

 of valuable time would have been wasted. Even as it was, a lot of trouble was 

 experienced in regulating the quantity of dust that was being applied, but finally, 

 after making some adjustments, we were enabled to feed out the sulphur-gypsum- 

 lead arsenate, the sulphur-zinc arsenite and the sulphur-lead arsenate mixtures 

 in the required amounts of about 30-36 pounds per acre. 



Directions for Spraying. 



Most up-to-date farmers who find it necessary to use Bordeaux mixture are 

 acquainted with its method of preparation, so that it seems superfluous to repeat it 

 here. Suffice it to say that the formula of the mixture employed in our experiments 



