New YorK AGRICULTURAL EXPERIMENT STATION. 347 
The results with the other washes were not such as to indi- 
cate a superiority over the lime-sulphur-salt wash. The summer 
treatment was successful as far aS summer treatment with a 
spray for this insect is likely to be. It was found that on plum 
trees the sulphur should be reduced to a minimum to prevent 
burning the foliage. One pound of sulphur to each ten pounds 
of lime was found sufficient to kill the scales during the summer 
and did not seriously injure the leaves. The salt was omitted. 
The difficulty, however, cf thoroughly spraying the bark of trees 
that are in foliage makes summer treatment with washes un- 
satisfactory as a rule. 
The following conclusions may be considered as indicated by 
the experiments: 
1. No special apparatus is required for the application of the 
lime-sulphur-salt wash. A machine suitable for spraying bor- 
deaux mixture will be found satisfactory. Care should be taken 
to protect the hands and face while spraying with the wash. 
2. The wash does not spread readily upon the bark, and hence 
much pains should be taken to hit every part of the tree. 
5. Through its soluble ingredients, the wash acts directly as a 
contact poison, killing the scales soon after coming in contact 
with them; and indirectly, through its insoluble or slowly soluble 
ingredients, aS a mechanical preventive to the development of 
the young. The efficiency of this phase of the wash is greatly 
aided by the presence of an excess of lime. 
4. The lime-sulphur-salt wash may be combined with bordeaux 
mixture either in the proportions known as the Oregon wash or 
by adding a dilute solution of copper sulphate to the formula 
given in this bulletin in the proportion of one pound of copper 
sulphate to each eleven gallons of the diluted wash. This 
method is preferred. 
5. The wash should be applied early in the spring, a short 
time before the buds begin to swell. 
6. The wash apparently does not injure apple, pear, peach and 
plum trees (the varieties included in the experiments), the only 
effect being to delay the foliage about a week. 
