18 • 



A Member. Why do you have a Baldwin spot in one tree 

 and not in another tree? 



Professor Whetzell. The only way I can answer that is to 

 ask why does one man get baldheaded and another man 

 doesn't? There is some particular condition respecting that 

 tree. Trees are just as individual as you fellows are. Some of 

 them, because of the particular soil in which they grow, or 

 conditions under which they grow, or their inherited tendencies, 

 or something of that sort, show more Baldwin spots. Just as 

 some of you fellows can wear your hat all the time and not 

 get baldheaded. Others can't wear it at all. You will get 

 baldheaded, anyway. 



A Member. I would like to ask Professor Whetzell if he 

 thought he could control apple scab just as well by dusting 

 as he could by the liquid spray. I have often found the 

 liquid spray in the" pink stage is just as important as the spray 

 after the blossoms fall. 



Professor W^hetzell. In New York State it is more im- 

 portant. 



A Member. How can you get dust on the pink stage? 



Professor Whetzell. Just as well as on the calyx. 



A Member. Is it as effective on the Mcintosh where they 

 are subject to apple scab? 



Professor Whetzell. Taking the averages of the experi- 

 mental dusting work done in New York,. Illinois, Michigan and 

 Nova Scotia, taking the average of the work going on since 

 1912, ■ — I do not know how many total years that would be 

 for all of them, — but taking those averages, as I. took them 

 last week, I found on the average the difference between dusted 

 and sprayed trees, so far as scab control was concerned, did 

 not vary more than 3 or 4 per cent, which is within the range 

 of experimental error. Now that you talk specifically on that 

 particular variety, I do not recall the varieties that were in- 

 volved, but' I do recall that in a number of these cases we had 

 as high as 95 per cent or more of scabby fruit on the checks, 

 and reduced it to 85 to 90 per cent on the dusted. Does that 

 answer the question? 



A Member. Do you advocate dusting under any conditions 

 when the trees are in blossom? 



