TIVENTIETH ANNUAL MEETING. 



57 



Sulfocicle, 1 to 400, and potassium sulphide, 1 to 50. in 

 the first summer spraying without an insecticide, produced 

 very little injury, though we have seen some injury produced 

 by Sulfocide on other trees at the same strength. In the 

 second spraying, arsenate of lead was added to both these 

 sprays, and as a result the trees were not onl\ stri])[)ed of 

 their leaves and fruit, but the young twigs were more or less 

 injured. In fact, we have actually killed young peach trees 

 at one spraying by adding Paris green to potassium sul|)hide, 

 whereas trees sprayed with the potassium sulphide without 

 this poison showed practically no injury. The arsenic of the 

 poison when combined with Sulfocide or potassium sulpliide is 

 changed to a soluble arsenate, thus causing the injury. Sul- 

 focide has to be used so weak on peach trees that its fungicid- 

 al value is somewhat doubtful, and it certainly should never 

 be used on them with a poison. 



From the results of our experiments with peaches, we 

 certainly think it well worth while for our growers to spray 

 their trees, especially the early varieties subject to rot. Our 

 experiments were with those varieties particularly subject to 

 rot, namely, Waddell, Triumph and Champion. At the Jones 

 orchard, while the rot and scab on the unsprayed Champion 

 occurred on 75 per cent of the fruit, on those sprayed with 

 the self-boiled and Niagara lime-sulphur this was reduced 

 to 27 per cent. 



While almost as good results were obtained with two as 

 with three sprayings this year, on account of the dry weather 

 during the spraying season, we would recommend three sum- 

 mer treatments, as follows: (1) a week or so after the 

 petals fall. May 10th to 15th; (2) on the young fruit, June 

 1st to 15th; (3) on the larger fruit, July 5th to 15th. At 

 present we recommend for general use the self-boiled lime- 

 sulphur, though the commercial brand tested gave as good 

 results. We do this because we have tried only one brand, 

 and that on a smaller scale than the self-boiled. We do not 

 hesitate to say, however, that if experience shows the commer- 

 cial forms just as efficient and no more dangerous to use than 



