April, ’24] 
DAVIS: SPRAYS FOR SAN JOSE SCALE 
289 
ately or heavily infested trees are able to increase and encrust a vigorous 
tree by fall. The dry lime-sulphur when used at twice label strength 
was about equal in effectiveness to the liquid concentrate. 
The oil sprays were uniformly effective. From our tests reported 
above, general observations, and further tests by Porter, we would 
recommend a three per cent strength of the new lubricating oil emulsion 
where the trees are incrusted or where the scale seems to be increasing. 
It might be noted in addition that rather uniformly better results were 
obtained by spring than by fall applications, in the case of lime-sulphur 
but in the case of the oil sprays, the time of application seemed to 
make no difference in the effectiveness of the material. 
No recommendations are being made at the present time relative to 
the use of the new lubricating oil emulsion as a summer application. 
Peaches are likely to be injured. Under ordinary conditions apples in 
foliage are not injured and although some growers have been able to 
prevent scale spotting to a large extent by spraying in the summer 
with a two per cent emulsion, our results will not permit us to recommend 
the summer use of the emulsion or any other spray for the control of 
the San Jose scale. Because of variable results obtained by growers 
under conditions known to us, the emulsion cannot yet be recommended 
as an aphis control. Furthermore, only the boiled emulsion is at present 
recommended for scale control in Indiana. 
Mr. F. A. Fenton: I would like to ask Mr. Davis in what amounts 
the spray should be applied on apple’ 
Mr. J. J. Davis: Our experience was only with the Oyster Shell 
Scale on lilac and similar shrubs. We have had no trouble with the 
Oyster Shell Scale in apple orchards which is a different form from 
the common one on apple, but doubtless controlled by the same measures. 
Mr. O. I. Snapf: I would like to ask Mr. Davis what has been his 
experience, and what results he obtained from the use of the cold-stirred 
mixture. 
Mr. J. J. Davis: Our experience with cold-stirred mixture was not 
sufficient to warrant making any further statement. We have not been 
able to make uniform preparations in all cases with cold-stirred methods, 
and our results in experimental work are not sufficient to make any 
definite statements, except that we are not ready to recommend it. 
Mr. Leonard Haseman: We used the cold-stirred oil emulsion in 
Missouri and in our experimental tests we got practically the same 
