36 



eedar, showing big, yellow, gelatinous masses forming in 

 the spring, during the rains, some of these spores will carry 

 to the apple. The point is to get that spraying in just be- 

 fore the rains, which give you the gelatineous masses on the 

 cedar, and that will have to be individual matter for every 

 one if the growers. Study the situation and keep an eye 

 on the cedar and find what time it occurs. It varies in dif- 

 ferent localities by as much as two to three weeks. You 

 will have to study a little bit and then make your spray 

 time to meet it just ahead of that. The difficulty is that this 

 comes at a time when the apple leaves are opening, and 

 there may be a growth before and there may be some after 

 the spraying, which will be infected because you couldn't 

 cover it, it wasn't out yet. But I imagine that early spray- 

 ing just before the blossoms open, if you pay attention to 

 the rains which come in your sections, and put it on just 

 before those rains, would probably get it. "We have so lit- 

 tle of it in New York State that we never did anything 

 especial on it, and what I am trying to give you is merely 

 what I have gathered from experience of pathologists in 

 other states. It is second-hand information and isn't very 

 reliable. 



MR. FARRAR OF LINCOLN. I would like to ask 

 the Professor if, in using arsenate of lead with lime-sulfur, 

 there is any danger of chemical reaction injuring the fol- 

 iage? 



DR. WHETZEL. That is the chief danger, of course, 

 in mixing anything with lime-sulfur. Sulphite of lime is a 

 chemical solution which reacts quite readily with other 

 things, and you do have chemical reaction between arsenate 

 »f lead and lime-sulfur. But the bulk of the evidence indi- 

 cates that the danger of injury to the apples is very small. 

 It does injure peaches, and some varieties will not stand the 

 combination at all. In connection with some experiments 

 by Scott of the Department of Agriculture, it was found 

 that injury resulted where the apples were sprayed two or 

 three times or more during the season. Arsenic was appar- 



