APPLYING MATERIALS 



349 



or the temperature is below about 65° F. The higher the tem- 

 perature, the better. 



Dusting before rainy spells is just as important as spraying 

 ahead of a rain, for the control of fungus diseases. Some of the 

 dust will be washed off, but enough will remain to inhibit spore 

 germination. 



The arrangement of supplies is simpler than for spraying. 

 Sufficient materials for a half day may be carried on the 



(Niayara /Sprayer Ohemical Oo.V 



Pig. 134. The duster in operation. The discharge pipe is pointed a; 

 little too high so that dust is going over the top of the tree. 



machine, or sacks of material may be placed at the ends of 

 rjows. 



In covering the trees, it is not customary to stop, the ma- 

 chine moving constantly over the ground. For small trees a 

 fast-moving team or tractor is best; for large trees, a slow 

 movement gives more time to cover the trees thoroughly. With 

 small trees a quick puff made by opening the feed lever as the 

 discharge pipe passes the tree and then shutting it off again is 

 sufficient. The discharge pipe must be moved enough so that 

 the entire top, including exterior tips, is covered. This is a 



