Table 3,-="Wilt" control obtained from 2 years treatment of nursery elms with 
liquid lime sulphur as a dormant spray and with sulphur as summer 
Sprayse 
Difference in Percentage of 
Plot numbers No. of trees No. of trees favor of (+) or control (+) 
and originally contracting against (-) or lack of 
treatments used present disease treatment control (+) 
| Plot XII (sprays ) 
Check 134 21 
Pruning 145 35 - 12 = 5208 
Dormant and flotation 
sulphur summer spray 142 26 - 4 - 17.4 
Dormant, flotation 
sulphur + pruning 142 4.1 ~ 19 - 82.6 
Dormant and Koloform 
summer spray 146 20 - 2 - 8.7 
Dormant, Koloform 
+ pruning 141 26 -~ 4 - 17.4 
_*Calculated on a basis of 146 trees per block. 
Twoxyear Tests of Dormant and Summer Copper Sprays 
Combined dormant and summer treatment with fungicides in which copper is 
the active ingredient have been attempted, in spite of the apparent ineffectiveness 
| of commercial Bordeaux as a summer spray. In plot XII tests of "Z-0" (see p. 3), 
(and in plot XIII tests of Instant Bordeaux (see p. 2), have been under way for 2 
years. The data taken up to the present in these plots are summarized, with present 
(indications, in table 4, 
The value of both "Z-O" and Instant Bordeaux is much in doubt, the data 
being inconclusive. When used alone they have permitted more trees to become dis-= 
eased then occurred in the untreated checks, but when combined with pruning, shown 
‘to operate unfavorably in both plots, the outcome is equivalent to no treatment at 
‘all for "Z-0" and 32 percent control for Instant Bordeaux. 
~10= 
