2 Farmers’ Bulletin 1285. 
USES OF LIME-SULPHUR. 
DORMANT SPRAY. 
During the winter or dormant period of deciduous fruit trees 
lime-sulphur is widely used by fruit growers for the control of the 
San Jose scale and pear-leaf blister-mite. It is also of value against 
the oyster-shell scale and the scurfy scale. As a fungicide the dor- 
mant application of lime-sulphur is very effective in preventing 
peach leaf-curl. 
DELAYED-DORMANT SPRAY. 
Many fruit growers do not apply the dormant spray until the 
apple-bud tips show green. At this time many of the aphids have 
hatched and have clustered on the 
tips (Fig. 1) where they may be killed 
if nicotine is added to the lime-sulphur 
solution. Thus the orchardist controls 
both the scale insects and aphids in the 
one application instead of making two 
separate treatments. Care should be 
taken, however, to complete the spray- 
ing by the time the leaf tips begin to 
separate, since the aphids crawl to the 
base of the leaves as they unfold and 
are thus more or less protected from 
the spray; also, if the delayed-dormant 
treatment is made too late, the lime- 
sulphur is likely to burn the expanding 
fohage. In large orchards and where 
scale insects are serious, it is not al- 
- Ways expedient to delay the dormant 
treatment until this time, since unfavor- 
able weather conditions may interfere 
with the complete covering of the or- 
chard within the prescribed period. 
ic. 1.—Aphids clustered on ex- 
panding apple bud; proper SUMMER SPRAY 
time to make delayed-dormant 
(ocnlatance amd eievien oe When trees are in foliage lime-sul- 
phur, at appropriate summer strengths, 
may be used on all pome fruits, and is of value chiefly as a fungicide 
for certain diseases, notably apple scab. Its use in the summer also 
aids in reducing the San Jose scale. For the prevention of leaf-spot 
of the sour cherry the same strength as that used on the apple should 
be applied, but on the sweet cherry a weaker spray should be used. 
(See dilution table,p.11.) Lime-sulphur solution should never be 
used on peaches or Japanese plums when the trees are in foliage. 
HOMEMADE VERSUS COMMERCIAL CONCENTRATES. 
GENERAL COMPARISON. 
The chief difference between the homemade product and that sold 
commercially is in the density of the solutions. The commercial 
