STATE HORTICULTURAL SOCIETY. Ill 



of about two weeks, until Octol)er -ith. These lots were each exam- 

 ined for c-o(llin<^ moth injuries, as were also the picked ap])les gath- 

 ered from the trees October 4th. 



From the data thus recorded, tables were prepared, such as I 

 published in your last year's report. As these tables are, however, 

 very unsuitable for public exposition, T have converted the essential 

 facts contained in them into graphic diagrams, by means of which 

 the comparisons between the poisoned trees and the checks can be 

 readily made by every one. As this year's experiments are really 

 continuous with those of the year preceding, I have brought my last 

 year's results into this discussion, preferring to present the whole sub- 

 ject to you in a complete and finished form, even at the expense of 

 some slight repetition of matter already published. 



We begin the discussion with Diagram I (P.), exhibiting the 

 result of the spraying of two trees eight times with i*aris Green in 

 1885, as compared with two other trees selected as checks. After 

 spraying three times (.June 9th. 20th and 30th), the apples were 

 first picked up July l()th, and already fifty-nine per cent, of those 

 fallen from the check trees were wormy. Passing across the page 

 from one open band to another, we see at first a little rise in the 

 in the ratio of injury, and then a falling off to fifty-one per cent. 

 July 31st — the lowest point of the season. This decline coincides 

 with the interval between the first and second broods of the larva?. 



Our notes show that at this date no full-grown larvte whatever 

 were found, and only a few very small ones at the blossom end of 

 the apple, — evidently the young of the second brood. 



The averages of injuries to fallen fruit now increased rapidly to 

 the end of the season (which for these apples closed Se[)tember 10, 

 when all remaining were picked). The highest point of injury, it 

 will ])e noticed, was eighty-one per cent., while the i)icked apples 

 showed, September 10, a damage of seventy-three per cent. Taking 

 together all the apples fallen from the trees, sixty-five per cent, of 

 them are seen to have been damaged by the aj)ple worm; or. finally 

 adding fallen and harvested ap[)les in one grand total, which includes 

 the entire product of the trees, we conclude that sixty-nine per cent, 

 had been infested by this insect. 



These data give us our standard of comparison. Looking now 

 at the solid bands representing the codling moth injuries to the 

 treated trees, the first thing that strikes us is, perhaps, the close 

 corres])ondtn(e of the two sets of bands, — all the U|)s and downs of 

 the longer columns being repeated in the shorter. This is evidence 

 that the two sets of trees were good companion lots, both being 

 apparently affected in the same way by the same conditions. 



Next we notice that the ])oisoned trees suffered much less from 

 the codling moth than the others. Beginning at about seven per 

 cent, the bands representing injury rise to twenty-five ])er cent., fall 

 again to thirteen per cent., and culminate, September 3, at thirty-six 



