STATE POMOLOGICAL SOCIETY. 79 



day that the mixture was put on. An orchard dusted one day 

 was perfectly free; an orchard dusted about a day later, after 

 a little rain storm, was peppered. 



Question : Was that because the dust washed off ? 



Mr. Mitchell : No, sir ; because the rain got there a day 

 before the dust and infection took place before the dust got 

 there. 



Question : Have you had experience in controlling the oyster 

 shell bark? 



Mr. Mitchell : We have never had experience except as 

 we sprayed for San Jose scale. Seven years ago my orchards 

 were badly infested with scale and we sprayed them thor- 

 oughly and cleaned up most of the scale the first year ; we 

 sprayed them again the second year and cleaned up the rest of 

 the scale ; then I sprayed for three more years, and the last 

 two years I have not sprayed any. 



Mr. Yeaton : What material did you use ? 



Mr. Mitchell: Lime-sulphur. 



Mr. Yeaton : Have you ever used any oil ? 



Mr. Mitchell: I have never used any. 



Mr. Yeaton : Would you be afraid to ? 



Mr. Mitchell : I do not know — I am not afraid of many 

 things. I have ten gallons of oil, probably the oil that you are 

 thinking about, in my barn, that I expected to try out so that 

 I would know, but we were so busy that I did not take the 

 time to use it. I have never used any oil except one tankful 

 I sent out and it did not mix up right so we dumped it. I 

 have used kerosene emulsion for aphis. This year we did 

 some dusting for aphis. Is that much of a trouble up here? 



Answer : It bothers us a great deal. 



Mr. Mitchell : Now when dusting for psylla we passed a 

 couple of trees badly infested with aphis. We stopped to shoot 

 them just before noon. We went to the barn, unhooked the 

 horse, and came back twenty minutes later, and found almost 

 all of them killed with fifty pounds of tobacco snuff and fifty 

 pounds of hydrate of lime, a mixture that to apply costs a 

 cent a tree for material and a cent for labor, about two cents 

 a tree to apply it, and it just wiped up the aphis. 



Question : I thought they had to be soaked ? 



