REPORT OF THE STATE ENTOMOLOGIST I915 



37 



The yield in this orchard was so uniform that the figures need 

 comparatively little explanation, the one exception being that plot 2 

 produced a distinctly lighter crop than either plots 1 or 3. Despite 

 this, there is a progressive increase with the number of sprayings 

 from 48.04 to 75.77 per cent of perfect fruit and a correlated decrease 

 from 46.10 to 16.65 P er cen t of scabby apples. It will be noted 

 that a great reduction in scab infection resulted from the second 

 spraying. These figures are in marked contrast to the 20.96 per cent 

 perfect and the 74.77 per cent scabby fruit on the check trees. There 

 is comparatively little, as in other plots, variation in the percentage 

 of apples injured by the leaf roller. This amounts, for the three plots, 

 to 5.68, 6.97 and 4.70, respectively. These discrepancies are more 

 easily explained as normal differences among groups of trees to be 

 found in every orchard rather than as results from the applications 

 or minor deficiencies in treatment. The second spraying reduced 

 the percentage of wormy fruit in this orchard approximately by 2 

 per cent, while the plot sprayed three times did not give quite so 

 good results. This latter is presumably due to normal and unavoid- 

 able variations either in the trees or the treatment. It will be 

 observed that most of the wormy apples were injured by the late- 

 hatching larvae of the first brood and that only .08 per cent of the 

 fruit on all the plots was entered at the end. The relatively small 

 difference between the sprayed and the unsprayed trees, so far as 

 wormy apples are concerned, has already been commented upon. 





Summary of the one spray treatment, 



1915 









NO. 



PERFECT 



SCAB 



LEAF 

 ROLLER 



OR 

 GREEN 

 FRUIT 

 WORM 



CODLING MOTH, WORMY 



ORCHARD 



Total 



End 



Side 

 July 



Side 

 August 



Newfane 



Total 



5 391 



5 598 



23 503 

 34 492 



662 



12.20 



2 107 

 37.63 



II 291 



48.O4 



14 060 

 4O.76 



4 3i6 



80.05 



2 042 

 36.45 



10 835 

 46. 10 



17 193 



49.84 



709 



13. IS 



I 680 

 30.01 



1 337 



5-68 



3 726 

 10.80 



729 

 13.52 



1 549 

 27.67 



1 224 

 520 



3 502 

 IO.15 



9i 

 1.68 



28 



■ 50 



28 

 . 11 



147 



■ 42 



512 



9-49 



1 419 

 25-34 



1 188 

 5.05 



3 119 

 9.04 



272 

 5.04 



126 



2.25 



29 



. 12 



427 

 1.23 



Kendall 



Total 



Per cent 



Webster 



Total : 



Per cent 



For the purpose of comparing results in different orchards following 

 the same treatment, the data relating to the three plots receiving 



