139 



sufficient equipment of spray rigs to do the work in the same 

 time. Of course it would not be practical to own and operate 

 a sufficient number of spray rigs to equal the capacity of a 

 dusting outfit. 



Now, in the nature of the check the gentleman has sug- 

 gested, I naturally obtained from growers in ourneighborhood 

 who used the self-boiled liquid spray, reports on the protec- 

 tion they obtained with liquid spraying on blocks of the same 

 varieties of trees that we protected with the dusting applica- 

 tions. One of the best groM^ers in this section sprayed a 

 nice crop of Carman twice with self-boiled lime sulfur, and 

 lost about 25 % of the fruit from brown rot. The Carman 

 that we protected with the dust came through with negligible 

 loss from brown rot. This does not mean that the liquid 

 spraying was not well done, or the material used was bad — 

 there might be a dozen factors that would contribute to that 

 result, even including the weather, and they cannot be posi- 

 tively determined. What I know is that our crop of Carman 

 protected with the dusting materials, came through practi- 

 cally 100 %, and the other grower, spending approximately 

 the same money for protection with liquid spray, onlv 

 brought forth 75 % of his fruit to market. That margin of 

 25 % is very attractive, to say nothing of the advantage of 

 holding such a pest as brown rot down to a minimum. 



MR. HUTCHTNS : Do you think there was really some 

 chemical advantage in the use of arsenate of lead in the dust- 

 ing materials, as evidenced by the texture or finish of your 

 fruit ? 



MR. HACKETT : You mean as to color? 



MR. HIITCHINS : As to color, yes. 



MR. IIACKETT: It would be a broad statement to 

 make, after only one season's experience, that the use of the 

 arsenate of lead in the dust form does improve color decided- 

 ly. I think it does, but you will notice in the paper I read 

 the statement is made only mildly. One isolated tree, which 

 had two applications of dust, certainly seemed to show much 

 better colored fruit than the same variety dusted only once. 



