107 



and I got frightened and would not use any more of the 

 soluble sulfur, and I have it on hand now. I am told it was 

 a splendid thing to use alone and use the arsenate of lead in 

 a separate spray, so I would like to ask if that would be 'a 

 safe plan, to spray with the soluble sulfur and let it dry on 

 the tree, and then spray with arsenate of lead, at two differ- 

 en times? They would be mixed on the tree, and I was 

 wondering if anyone has had any experience. I would like 

 to use up the rest of the soluble sulfur in some way, and I 

 don't know what to do. 



DR. FELT. If I were in that fix, I would certainly try to 

 use my soluble sulfur as a San Jose scale spray. I don 't know 

 just what the result would be, and I am not sure that any 

 living man could tell you. I think a good deal would depend 

 on conditions following your application. If you put soluble 

 sulfur on first and there was considerable rain, there might 

 be enough of that washed off so that you could make an ap- 

 plication of arsenate of lead and there wouldn't be any 

 reaction. If, on the other hand, there was no rain to wash 

 it off, or wash off either one or the other — and the rain 

 wodldn't wash off much arsenate of lead, anyway — and you 

 got both on, and even though there was subsequent drying, 

 I wouldn't want to be responsible for the result with the 

 recurrence of moist conditions. In New York State trees 

 sprayed with a combination of soluble sulfur and arsenate of 

 lead showed progressive burning, which extended over a 

 considerable period. Some of the leaves which received a 

 heavy coating, came off early, and the others dropped off at 

 intervals of even three or four weeks, showing that there was 

 more or less chemical activity going on for some time. With 

 that in mind, it would be a little hazardous to permit a possi- 

 ble combination of that character. 



MR. IVES. It seems as if the western fruit growers 

 have met with all the troubles that we are going to be up 

 against, in these combined sprays, and I incidentally men- 

 tioned this zinc arsenate and sulphite of iron as a combina- 

 tion they are working on. I don't know whether the 

 Doctor has taken it up or not. If you use a Bordeaux 

 mixture for the first spray, on the bud we will say, and cease 

 to use Bordeaux then and use it just for one spray for that 

 period, for a fungicide with arsenate, if you want to. and 



