598 NEW JERSEY STATE AGRICULTURAL 



best period for the application is wlien the first brood is in full 

 swing and the trees are covered with larvae and recent sets. The 

 indication is. further, that well advanced young under black scales 

 are little affected and will begin to reproduce when little or none 

 of the material remains on the tree. In early September re-infest- 

 ation will be well under way, and a second application will be 

 necessary so this had better be deferred to the 20th or thereabouts 

 for a maximum effect. The cost of the sulphide is 25 cents per 

 pound, making 5 gallons of mixture; a cost for materials, includ- 

 ing lime of about 6 cents per gallon. At the rate of i gallon per 

 tree, which is fair for trees five or six years old and normal form, 

 two applications will cost 12 cents per tree, exclusive of labor. 

 At the end of the season there will be scales enough remaining to 

 re-infest and make identical treatment necessary the year fol- 

 lowing. 



ExPKRiMENT 5 — Sulphite of soda, ,1 pound; lime, 5 pounds; 

 water, 5 gallons; made up as directed, imd applied June i8th to 

 tree 12, a Reeves Favorite peach. This was to test the effect on 

 the foliage and, after it dried the tree had a dirty, somewhat 

 orange white appearance. June 20th, the whole tree was thor- 

 oughly coated with the material and none of the leaves showed 

 any trace of injury. Trees 17 and 18 were therefore treated as 

 before, and thoroughly coated. When examined July 3rd, the 

 trees, including foliage, were still coated and apparently unin- 

 jured. There were plenty of active larvse and recent sets on all 

 the trees; but, for some reason fewer on tree 17 than on either 

 of the others. July 18th conditions had not changed much either 

 way, except that there were a few more recent sets and some of 

 the earlier sets had attained the nearly grown black stage. This 

 was also the report on the 30th of that month, the scale seeming 

 to be almost dormant. August 13th the conditions had changed 

 and there was a full set of scales from the first brood, ready to 

 reproduce. Tree 12, indeed, was in such condition that it was 

 deemed best to re-spray, August i6th, with the "Con. Sol", i 

 part, to water 40 parts. Trees 17 and 18 were allowed to stand 

 until September 2nd, wdien they received a treatment of the same 

 kind and this experiment ended. 



Experiment 9 — Sodium sulphite, i pound; lime. 2 pounds; 

 water 5 ga llons ; prepared as directed and applied July ist and 

 2nd, to trees 250 to 301 inclusive. The materials combined well, 

 but there was a little settling, leaving a cloudy, watery solution on 

 top, which became limey on stirring. When dry the trees had a 



