April, ’20] SANDERS AND DE LONG: DUST FOR SOUR CHERRY PESTS 209 
case of the wet spray; also, in dusting one horse and two men required 
only half the time necessary in applying the wet spray with the aid of 
two horses and three men. The only disadvantage noted is that 
certain undesirable conditions of wind sometimes require a delay, and 
consequent loss of time. 
Reference to the accompanying table shows very decided results 
secured by the application of all the treatments as compared with the 
check or untreated plot, but attention should be called to the counts 
of curculio damage in the check plot, which were much below the actual 
damage because of the previous falling of injured fruit; and it should be 
stated that the injury to treated plots, and consequent falling of fruit, 
was very slight. The records of curculio and slug damage were made 
from examination on June 19, just as the fruit was beginning to ripen. 
The examinations for leaf spot injury were made on September 19, 
three months later. Attention is called to the almost perfect control 
of slug and curculio on the treated plots as compared with the untreated 
plots. There was some brown rot apparent in the treated plots, but 
markedly less than in the checks. 
Plot 
No. of 
trees 
Curculio 
Leaf spot 
injury 
Pear slug 
injury 
No. infested 
cherries 
No. cherries 
not infested 
Sulfur-lead dust 90-10 
6 
2 
1240 
None 
None 
Lime-sulfur spray 1-40 
5 
8 
1200 
None 
None 
Lime-sulfur-lead dust 50-45-5 
5 
1 
1191 
Slight 
Slight 
Bordeaux spray 3-3-50 to 1 
lb.lead 
5 
3 
1536 • 
Slight 
Slight 
Check 
8 
444 = 29% 
1071 
Slight 
No. slugs 
on trees 
978 
Leaves 
injured 
23% 
All Counts Made in Middle of Test Plots 
Little falling of leaves, and scarcely any spotting, on treated plots 
was noted before the first week of September. Later on—September 
19th—the falling of leaves on check plots was estimated at 60 to 65 
per cent, and practically all the remaining foliage was badly spotted. 
On the treated plots, Bordeaux mixture showed at this date 30 to 40 
per cent fall; lime, sulfur and arsenate of lead dust, 50-45-5, showed 
35 to 45 per cent fall; lime-sulfur spray, 25 per cent spotted and little 
falling; while sulfur and arsenate of lead dust, 90-10, showed about 25 
per cent spotting and no falling of leaves. 
It is proposed to continue these experiments in the summer of 1920, 
but it would seem that conclusions from this summer’s work would 
