The year by year results that have been obtained and the degree of disease control 
for the four-year period are given in table 4. 
All of these treatments permitted the occurrence of a greater number of cases of 
disease than occurred proportionally in the check block, but the variations in cases of 
disease shown by the several treatments are not otherwise consistent. In the check 
group 20 per cent of the trees became diseased and in the pruned group 35 per cent be= 
came diseased. Of the trees given the Koloform summer spray 28 per cent contracted 
disease, and of those sprayed with Koloform and pruned 25 per cent contracted disease. 
Of those sprayed with dry wettable flotation sulfur and "Mike" sulfur 26 per cent be— 
came diseased, and of those so treated and also pruned 34 per cent became diseased. 
The group of trees that were pruned had 76 per cent more trees that showed disease than 
did the untreated group. In comparison with the per cent of disease in the wmtreated 
group of trees there was 41 per cent more disease in the group of trees that was 
treated with dormant and Koloform summer sprays. But there was only 27 per cent more 
disease in the group of trees that received this same spray treatment in combination 
with pruning. 
In most of the treatments that were tested we have found that sprays in combina- 
tion with pruning have given a greater degree of disease control than have applications 
of sprays alone. However, in this experiment the group of trees treated for two years 
with dormant and dry wettable flotation sulfur and then treated for two years with 
dormant and "Mike" sulfur had 42 per cent less disease than did the group of trees 
that received the same spray treatment but was tested in combination with pruning. 
TWO-YEAR RESULTS FROM SPRAYING WITH “MIKE” SULFUR 
In one experiment involving 400 trees the effectiveness of summer spraying with 
"Mike" sulfur has been tested for two years. "Mike" sulfur alone and in combination 
with pruning, each treatment on 100 trees, was compared with pruning (100 trees) and 
with an untreated check group (100 trees). Six applications of the spray were made 
each summer. 
Most of the disease that has occurred in this plot has been caused by a Phoma, 
but a few Coniothyrium infections have also been found. 
The results that were obtained each year and the degree of disease control for 
the two-year period of the experiment are given in table 5. 
Two years of summer spraying with "Mike™ sulfur resulted in 92 per cent less 
disease than was present in the untreated check group of trees. There was 46 per 
cent less disease in the group of trees that was sprayed with "Mike" sulfur in combi+ 
nation with pruning than in the untreated check group of trees. The group of trees 
that was pruned had 38 per cent more disease than did the untreated check group. 
TABLE 5.--Disease control obtained from two years of spraying with "Mike" sulfur 
and from pruning. (Plot XV). 
Number of Trees 
Number Difference in |Percentage of 
mrantnent of Trees a ad Favor of (#) or | Control (+) 
Originally Against (~) or Lack of 
Treatment Control (-) 
Present Vioa7 | 1638 
Check. . 100 
Pruning: <; . . ee 100 13 ~ 5 trees - 38.5 
"Mike" sulfur. . 100 1 #12 trees + 92.3 
"Mike" sulfur and 
pruning. 4 ain 8 100 6 + 6 trees + 4662 
