1906 ENTOMOLOGICAL SOCIETY. 27 



great additional benefit derived from the addition of Bordeaux mixture to 

 the Paris green or arsenate of lead. For his part, he much preferred to use, 

 and always recommended to others, Paris green rather than the arsenate, as 

 its conspicuous color prevented any danger of its being mistaken for anything 

 else. 



San Jose Scale. 



Mr. G. E. Fisher, in the discussion on Prof. Sherman's paper, referred 

 to the methods of dealing wiih the San Jose Scale, and first to the use of 

 the lime, salt and sulphur mixture. He preferred to dispense with the salt 

 as it corrodes the pumps, and in his experience the mixture destroyed the 

 scale better without it. He used a heavy wash of the mixture, employing 

 one pound of lime to half a pound of sulphur in each gallon of wash. It 

 should be cooked for Uvo hours, not for one only, as was the common practice. 

 He made use of the steam from a threshing engine for the purpose, and 

 cooked twelve barrels at a time, in order to have an abundant supply both 

 for himvself and his neighbours. The test of the boiling was that the mixture 

 should finally turn green. 



The results were most satisfactory. An orchard of one hundred trees of 

 all sorts, badly infested with the scale, was treated three or four years ago 

 with the wash made in the manner just mentioned and was sprayed thorough- 

 ly; no scales have been found there since. The wash should be applied by 

 the middle of April, not later; he had found it safer to do the work from 

 the middle of March to the middle of April, if later injury was done to the 

 opening buds. 



Prof. Sherman expressed the opinion that it was best to apply the wash 

 as late as was safe, as he found that it stuck to the trees better and did 

 good work for a longer time. His mixture consisted of 20 lbs. of lime, 17 

 lbs. of sulphur and 10 lbs. of salt to each 50 gallons. In an orchard contain- 

 ing 20,000 peach trees the wash had been tried both with and without the 

 salt, and the results when the salt was included were much better than with- 

 out it. The boiling was done for at least one hour and the spray was applied 

 while hot. The advantage from the salt was that it made the wash stick 

 better. 



Prof. LocHHEAD read the following paper in which he gave an account 

 of his recent experiments in treatment for the scale. 



EXPERIMENTS AGAINST THE SAN JOSE SCALE IN 1905. 

 By Wm. Lochhead, Professor of Botany, Ontario Agricultural College, 



GUELPH. 



During the eight years that the San Jose Scale has been in Ontario many 

 remedies have been devised and applied for its extermination. Among the 

 early remedies were whale oil soap, kerosene and kerosene emulsion, potash 

 solution, soda solution, and dilute crude petroleum. All of these were only 

 partially successful. The whale oil soap was a most effective destroyer of 

 scale and a tonic for the tree, but was too expensive for the ordinary fruit- 

 grower to use. The potash and soda solutions were not sufficiently effective 

 against the scale to make them favorite remedies. Kerosene, either pure or 

 dilute, was too unsafe, and was soon discarded. The kerosene emulsion, 

 although quite effective in controlling the moving larvae, was not at all 



