40 



NEW YORK STATE MUSEUM 



noted, occurred on trees producing relatively few apples. The aver- 

 age percentage of end wormy fruit for these plots is 20.95, a great 

 increase in the average for the plots receiving one late spraying 

 and very different from the data for the sprayed plots where the 

 greater number of wormy apples have been injured by the second 

 brood and are therefore side worm}-. 



A study of the wormy fruit on the check trees during the three- 

 year period shows that nearly one-third (31.22 per cent) of the 

 entire yield was affected and that over two-thirds (20.95 P er cent) 

 of this was end wormy. A comparison of the end wormy fruit 

 produced on the sprayed trees shows at once that by far the great- 

 est benefit accrues from the first spraying, since this reduced the 

 percentage of end wormy to .394, a second bringing it down to 

 .308, and a third to .185 per cent. The one late spray (three weeks 

 after blossoming) reduced the end wormy, taking the check trees 

 as a standard, by less than one-half, that is, to 12.26 per cent. The 

 great value of the first application made within a week or ten days 

 after the blossoms fall and preferably early in this period, is at once 

 evident from these data. 



Comparative yields. The following tabulation of comparative 

 yields from the experimental plots will prove instructive, since 

 those from the plots sprayed three times, sprayed late and checks 

 have been raised pro rata to make up for a deficiency in the num- 

 ber of plots or a reduced number of trees in the plots and the fig- 

 ures thus indicate a fair comparative value. Those for the plots 

 sprayed three times are undoubtedly somewhat higher than they 

 should be, because there were no plots sprayed thrice in T9T0, a 

 year when the second brood of the codling moth was extremely 

 abundant, and as a consequence there was excessive injury. 



