i8 



NEW YORK STATE MUSEUM 



the percentage of wormy apples was excessive. The selected data, 

 which are believed to be more nearly representative, are given below. 



Codling moth, Mead orchard, 1918 



NO. OF 

 SPRAYS 



One. 

 One. 



Total . . . 

 Per cent . 



Two. 

 Two. 

 Two. 



Total . . . 

 Per cent . 



Three. 

 Three. 

 Three. 

 Three. 



Total . . . 

 Percent. 



None. 

 None. 



Total . . . 

 Per cent . 



D 



Per cent . 



E 



Per cent. 



A 



Per cent. 



C 



Per cent. 



D 



Per cent . 



A 



Per cent . 



C 



Per cent . 



D 



Per cent. 



E 



Per cent . 



TOTAL 

 FRUIT 



X 



Per cent . 



Y 



Per cent . 



I 66s 

 3 446 

 S III 



2 091 

 I 470 

 2858 

 6 419 



3 179 

 1687 



1 930 



2 452 

 9 248 



4 783 

 4 582 

 9 365 



PER- 

 FECT 



1 402 

 84 . 20 



2 896 

 84 03 



4 298 



84,09 



I 798 

 85-98 



1 147 



78.o;2 



2 S41 

 88.90 



5 486 

 85.46 



2 726 

 85.75 

 I 482 

 87.84 



1 638 

 84.87 



2 172 

 88.58 

 8 018 

 86.83 



3 967 

 82.93 

 I 940 

 42.33 

 5 907 

 63.07 



.06 

 161 



4.67 

 162 



311 



2.76 



7 



■41 



6 



.31 



13 



• S3 



114 



I 23 



104 

 2. 17 

 2 096 

 45-74 

 2 200 

 23-49 



LEAF 

 ROLLER 



109 

 6-54 



180 

 5-22 



289 

 5-65 



139 

 6.64 



123 

 8.36 



192 

 6.71 



454 

 7.07 



146 



459 



79 



4-68 



98 



S-07 



138 

 5-62 



461 

 4-98 



294 



4-14 

 24s 



5-34 

 539 



5-75 



115 

 9 30 



213 

 6-18 



368 

 7.20 



162 

 7-74 



130 

 8.84 



304 

 10.63 



596 

 9-30 



236 

 7.42 



124 

 7-35 



195 

 10. 10 



131 



534 



656 



7 09 



438 

 9-iS 



484 

 10.56 



922 

 9-84 



CODLING MOTH 



End Side Aug. f^^^' 



68 



[.48 

 117 

 C.24 



127 

 7.62 



154 

 4.46 



281 

 5.49 



ISS 

 7-41 



122 

 8.29 



273 

 9.SS 



550 

 8.56 



211 

 6.63 



113 

 6,69 



183 

 9-48 



124 

 5.05 



631 

 6.84 



381 

 7.96 



358 

 7.81 



739 

 7.89 



Examination of the above table shows first of all the progressive 

 increase in the percentage of perfect apples in plots sprayed once, 

 twice and three times and a markedly smaller per cent on the check 

 trees. There is a marked difference between the amount of scab 

 on the check trees and those which were sprayed and a considerable 

 variation between the plot sprayed once and the two receiving more 

 than one treatment, though for some cause or other plot 3 had a 

 higher percentage of scabby fruit than the one sprayed twice. It 

 is one of the anomalies which can not be readily explained. It will 

 be noted that leaf roller or white-marked tussock moth injury to 

 fruit, probably both, was not materially affected by any of these 

 treatments. Codling moth infestation was much less in this orchard 

 than last year, the percentage for the two check trees, 9.84, falling 

 far below the 41.69 per cent of wormy fruit found in 191 7 on the 

 unsprayed trees in this orchard. The relatively light infestation 



