STATE POMOLOGICAL SOCIETY. 163 



[From Report of the New York Agricultural Experiment Station, IS85.] 



Spraying trees with Paris green and water has been often recom- 

 mended as a preventive against injury from the codling moth {Car- 

 pocapsa pomonella, L.). In order to learn to what extent the harm 

 wrought by this destructive insect may be thus avoided, we sprayed 

 a few of the trees of the station orchard the past season, and on a 

 portion of the trees made careful notes, intended to show as nearly as 

 possible how much benefit resulted from the application. The trees 

 selected lor the experiment were eleven in number, of which nine 

 were of the Fall Pippin variety, and the remaining two Rhode 

 Island Greening. On June 3d we sprayed five of the Fall Pippin 

 trees and one of the Rhode Island Greenings with Paris green and. 

 water at the rate of a teaspoonful to ten gallons. At this time the 

 fruits were about the size of a cranben-y. Alternate trees were left 

 unsprayed for comparison. 



The liquid was applied to the trees by means of a garden engine 

 and the "cyclone nozzle." The nozzle attached to a hose was tied 

 to the end of a light pole, about ten feet long, by means of which it 

 could be raised and lowered at will, for spraying ditl'erent parts of 

 the tree. 



We found this method of application quite laborious. The 

 amount of water that the nozzle would allow to pass through it was • 

 so small that from a fourth to half an hour was necessary to thoroughly 

 wet the foliage of a large tree. We tried attaching two nozzles to 

 the end of the hose, which performed the work considerably faster 

 than one. 



On June 5th a very heavy rain fell, and fearing that this had largely 

 washed off the poison, we made a second application of the Paris 

 green and water at the same rate as before. 



On June 17, we found on close examination that the larv£e of the 

 codling moth were still hatching and entering the fruits, which were 

 at this time about the size of a small cherry. Wishing to make our 

 application as thorough as possible, we sprayed the trees again on 

 the following day, using one ounce of Paris green to ten gallons of 

 water ; applying the mixture this time with the so-called Field force 

 pump fitted with the "Boss" nozzle. We found this apparatus very 

 satisfactory. The liquid left the nozzle in a thin sheet, which ex- 

 panded in width as it rose in the air, and soon became broken up 

 into a fine spray. Bj- the time it reached the height of the tree top 

 it was so finely distributed that it was necessary to hold the nozzle in 



