590 NEW JERSEY STATE AGRICULTURAL. 



new foliage was more abundant and so were the recent scale sets. 

 As a whole the trees looked a little better than before. July 30th, 

 except for the thin foliage, confined mainly to the outer portion of 

 the trees, no abnormality was obvious. The scales had increased 

 steadily in number and all stages from active larvae to breeders 

 were well represented. August 13th, something had happened; 

 the older scales were mostly dead, the recent sets were not so 

 numerous as before; and the moving larvae were very scarce. 



But from this point the insects made a new start and on Sep- 

 tember 7th it was decided to respray with the "Con. Sol", i part 

 to water 40 parts. Even this application, at wmter strength did 

 not check the increase and, when I saw them, October 3rd, the 

 trees were in an extremely bad condition with scale simply 

 swarming everywhere. The proportion of scales killed in the first 

 application had not been sufficiently large to prevent complete 

 re-infestation before mid-summer. The apparent check in 

 August could not be credited to the June application, all traces 

 of which had long since disappeared. The severe effect on the 

 foliage would have reacted upon the fruit had there been any. 



Experiment 2 — Potassium sulphide i pound, in water 3 gal- 

 lons; a simple solution; applied to trees 4, 5 and 10, all Reeves 

 Favorite, June i8th, under the same conditions as in Experi- 

 ment I. 



June 19th and 20th progressive scalding of the leaves was 

 noted, and on July 3rd, the trees were almost completely defoli- 

 ated ; only a little start being made from the tips. Part of the 

 young shoots in the center of the tree were killed. As to the 

 effect on the scale; a large percentage had been killed, without 

 doubt ; but there were yet a fair number of living adults, a num- 

 ber of new sets and also some crawling larvae. July i6th, the 

 trees were slowly recovering from the shock and the scale situa- 

 tion had improved, materially; most of the older sets examined 

 seemed to be dead, and the number of young had been materially 

 reduced. July 30th, there had been no material change and that 

 was also the record August 13th. September 7th, there had 

 been sufficient increase to warrant spraying with the "Con-Sol," 

 but this helped nothing and, October 3rd, when I saw the trees, 

 there had been an enormous increase, every tree swarming with 

 larvae and recent sets. 



The effectiveness of this application cannot be reasonably 

 doubted; but the foliage suffered so severely that it cannot be 

 recommended. It was not, in any event, sufficiently active to 

 bring the scale down to such a point that the trees could be safely 



