EXPERIMENT STATION REPORT. 597 



time larvae were active on all trees, plenty of recent sets were in 

 evidence and there was already, quite an appearance of half 

 grown black individuals. The exact amounts were as follows : 

 "Used 14 pounds of lime, 7 pounds of Potassium sulphide, and 

 35 gallons of water. Slacked the lime in 4 or 5 gallons of water, 

 then while still warm added the sulphide dissolved in 2 gallons of 

 water. This mixed well and nearly all the lime was taken up ; but 

 there was a slight settling and the mixture gave a dark orange 

 red color." The trees at first sprayed — 8 in number — dried out 

 white, perhaps because the excess of lime settled rapidly ; most of 

 the others dried out to a bluish tint. July 5th, all the trees showed 

 some injury to foliage; but in a general way the less lime was 

 apparent, the greater was the burning effect; in no case was it 

 very bad, however. 



July 1 6th the record for these trees was very good. Only a 

 few trees showed any laryse or recent sets ; dead adults with dead 

 larvae beneath them were numerous, and in a general way it ap- 

 peared as if there had been a killing off that was almost com- 

 plete. On all varieties the foliage had been somewhat scalded 

 and some leaves had dropped ; but in no case was the tree injured, 

 nor had there been any unfavorable effect on the fruit. July 30th 

 the record was still good; but active larvae and recent sets were 

 now found in small numbers, on all the trees : evidently the sur- 

 vivors of the first brood were beginning to reproduce. August 

 13th while there had been some increase in the scale, the trees 

 were among the best in the orchard and the application was 

 ranked in effectiveness next to the lime, sulphur and caustic soda, 

 with little to choose between them. The foliage, at that time was 

 noted as being a little thinner than normal, a little ragged and 

 somewhat mottled, but otherwise natural. 



September 2nd, this series was first in order of condition, 

 though much worse than at the previous examination. Accord- 

 ing to the reports there were quite a number of breeding adults ; 

 many large plump specimens on the new growth and at the bases 

 of the leaves, and some of these were reproducing or were ready 

 to do so. There was also a general, though rather thin scattering 

 of white sets and active larvae. Altogether matters were not con- 

 sidered satisfactory and, on September 6th, all these trees were 

 sprayed with the "Con. Sol", i part, to water 40 parts, and the 

 experiment was closed. 



Taking all these applications of Potassium sulphide together, 

 the conclusion is that the mixture last used can be effectively 

 employed on peach trees in summer, with little danger of injury 

 to the foliage or fruit, and good effect as against the scale. The 



