FOURTEENTH ANNUAL MEETING. 157 



April 13 with 20 per cent. K-L. On May 20 the trees were 

 examined, hut not a hving scale could be found. The mix- 

 ture had cleaned up the bark nicely and was still adhering 

 well, but not quite so well as was the lime-sulphur-salt wash. 

 Not until June 28 were a few stragg-ling- young found on 

 sprayed trees. The results of both remedies were identical 

 except that one tree, designated as Number 2 in the K-L test, 

 had quite a good many young scales at this time. No satis- 

 factory explanation can be offered for the condition of this 

 tree. The unsprayed trees which had only a sprinkling of 

 scales in the spring were badly infested at this time. 



On July I a second spraying with 10 per cent. K-L was 

 given to four of the trees with only an occasional young 

 scale, and to tree Number 2 with a good many young ones. 

 On July 9 no live scales could be found on any of these trees, 

 however, the old females had escaped even though they could 

 not be located. Perhaps the spray assisted in concealing 

 them. By August 12, tree Number 2 had a sprinkling of 

 young scales like it had when sprayed July i. On the other 

 trees sprayed at that time were found, on one tree, one young 

 scale; on another, three or four; on another, half a dozen; 

 on another, about a dozen. 



On the trees not sprayed July i were found about a half 

 dozen young scales each. They were freer from scale than 

 were many of the lime-sulphur-salt sprayed trees. Some of 

 the latter harbored only an occasional insect, while others had 

 a good many. The check trees were quite covered by this 

 time. 



A second summer application of 10 per cent. K-L was 

 given to four of the trees August 17. On the 23d a few 

 scales were found on tree No. 2 and isolated ones on the other 

 trees. Of the eight trees in this experiment two received no 

 summer treatment. On August 23, when the experiment 

 closed, no live insects could be found on one of these and only 

 half a dozen on the other. No further observations could be 

 made because the owner decided to destroy the orchard im- 

 mediately. 



The lesson which this experiment teaches is that 10 per 

 cent. K-L, while it will destroy young scales, is not strong 

 enough to kill the old breeding females, although two or three 



