Kkv York Agricultural Experiment Station. 555 



Kerosene emulsion, at summer strength, has no effect on either 

 the pistol-case-bearer or the cigar-case-bearer. The use of the 

 trap lantern does not seem to be a satisfactory method of com- 

 bating this insect. 



Additional notes. — When buying Paris green be sure that it is 

 pure. A simple test for pure Paris green can be made with 

 strong ammonia. Place a little of the Paris green in a test-tube 

 and add enough ammonia to cover it well. Stir thoroughly with 

 a glass stirring rod or other convenient instrument. If pure, all 

 of the Paris green will dissolve readily, the solution turning at 

 once to a deep blue color. If any sediment appears in the bottom 

 of the test-tube, the Paris green may be considered adulterated. 

 This is not necessarily an infallible test but may usually be con- 

 sidered of practical value. Another very good test is to place a 

 little of the Paris green between two pieces of window glass and 

 rub them together. If the Paris green is adulterated with lime 

 or barium sulphate, which are quite frequently used for this pur- 

 pose, the Paris green will appear to turn white in places. This 

 appearance is caused by the small chunks of lime or barium sul- 

 phate which, when broken open, appear light colored. 



As it is usually desirable to spray the orchard with Bordeaux 

 mixture at the same time that the Paris green is applied for the 

 pistol-case-bearer, the two may be combined as neither interferes 

 with the beneficial action of the other. Add the Paris green to 

 the diluted Bordeaux mixture in the same proportion as if it were 

 being mixed with water. No additional lime need be added as 

 the lime in the Bordeaux mixture will be sufficient. 



Do not spray while the trees are in bloom. — There is nothing to 

 be gained by so doing, and a good deal of injury may be done. 

 The Bordeaux mixture and Paris green will be just as effectual 

 if applied as indicated above, and then no injury will be done to 

 the bees and other friendly insects which visit the blossoms and 

 upon which largely rests the important responsibility of carrying 

 the pollen from one flower to another. 



