593 NEW JERSEY AGEICULTUEAL COLLEGE 



sion shoulil hv an absolutely even milky-white liquid, without scum 

 or .sediment, and it should remain of the same texture throughout 

 the work. In test tubes the emulsion should remain perfect and 

 without separation, either to bottom or top, for several days. 



Used with these precautions any differences in the results ob- 

 tained cannot be charged to differences in the material, and if a 

 good effect is noted from one application the reason for the failure 

 of another must be sought outside of the composition of the in- 

 secticide. 



Examinations Made. 



In the course of his inspections, Mr. Dickerson examined orch- 

 ards treated with ''Scalecide" in the Hunterdon county peach 

 districts, at many points in Burlington county, at several points 

 in Morris county, in large sections of Mercer county, a feW' in 

 Middlesex county and a number in Cumberland, Monmouth and 

 other southern counties. These orchards, containing many thou- 

 sands of trees, were peach, apple and pear, in the order named, 

 and also a few^ plum and other of the usual fruit trees. His con- 

 clusions, based upon these examinations, are that the results have 

 been, on the whole, good, but very irregular, and he suggests sev- 

 eral reasons for this — first, too great a confidence in the killing- 

 power of the material, leading to a careless application, and the 

 belief that it would work around an}^ branch and through any 

 mass of scales, however thick; second, used at the strength of 

 1 to 20, the mixture contained only a small percentage of oil, and, 

 unless very thoroughly applied, not enough actual oil reached the 

 tl-ees to be effective; third, the mixture dries rather rapidly and 

 does not leave any deposit or mark to show where it Avas applied ; 

 as a result, unless the work is very carefully done, some parts of 

 the tree are apt to be missed. That the material will do the work,, 

 where thoroughly applied, was shown in numerous instances. As 

 an illustration, a badly-infested plum tree was sprayed to a drip, 

 with the result tliat in the midsummer following it was yet free 

 from live scale. This was one especial instance in a large orchard 

 where it was intended to give the material a severe test, the rest 

 of the trees receiving a more moderate treatment. It simply 

 meant that where enough of the material reached the tree it did 

 the work required. In all cases it mixed well Avith water and 

 sprayed nicely, for which reasons and the ease of application it 

 was much liked. 



