192 



THE CONNECTICUT POMOLOGICAL SOCIETY. 



On peaches, the commercial lime-sulphur sprays have 

 given somewhat variable results. We are not sure whether 

 this was partly a question of the brand used. Some brands 

 gave injury, while others, even at a higher strength, did 

 not; but they were not tested in the same orchard under 

 conditions otherwise the same. 



Comparatively little injury was observed on apple foli- 

 age from the use of Atomic sulphur, but on peach and cur- 

 rant leaves there was more than was anticipated. In one 

 case the young twigs of peaches were quite severely spot- 

 ted. Whether or not less injury would occur on the peach 

 without the arsenate of lead present, was not determined. 



The self-boiled spray mixtures have given compara- 

 tively little injury to the foliage of either apples or peaches. 

 The same is true of sulphur and arsenate of lead, and of 

 arsenate of lead used alone. However, we have had called 

 to our attention two cases where Grasselli's arsenate of lead 

 caused injury to apple and peach foliage. Ortho-arsenite 

 of zinc used alone caused similar injury for one grower. 

 We are not quite sure of the explanation of these cases. 



With the miscellaneous commercial sprays containing 

 sulphur in some form we have had the most trouble from 

 leaf injury. Some of these sprays have to be used rather 

 weak to avoid injury, and with all it seems to be largely a 

 question of a chemical change, when combined with an in- 

 secticide, especially arsenate of lead, whereby an injurious 

 soluble arsenate is formed. With these sprays, as in the 

 case of potassium sulphide and Sulfocide, when used in 

 combination with arsenate of lead, we have had serious in- 

 jury to peaches, not only to the foliage, but to the young 

 twigs as well. With such a combination trees can even be 

 killed. This year the Sulfocide used as weak as 1-300 and 

 only one-quarter pound Paris green per barrel, with the 

 addition of lime, gave no serious injury on apples. These 

 strengths are rather weak to have the best fungicidal and 



