99 
REPORT OF THE STATE ENTOMOLOGIST IQI2 2 
amount placed upon the foliage if a second spraying be given dur- 
ing this period, as will be seen shortly, is of comparatively small 
value in destroying codling moth larvae. 
Summary of four years’ work with one spray for the codling moth 

on 












CLEAN FRUIT WORMY FRUIT 
PLOT SERIES | YEAR meee | End Bor 
Total Per Total | Per End | and | Side | cent 
cent , cent |wormy| side |wormy| end 
wormy wormy 
1 Pee ES te ey See ee 1909 Aen 29818] 98.81 359; 1.19} 33] 18 BOS rae sats 
faerie fe Bc. Giny sve 1909} 20313) 20017} 98.55 296) 1.45 31 6 DEO « 2 doles 
eyo tay erect Rt sera I909| 21264! 21042} 98.96 222) 1.04) 23 18 TOE) estes 
AD Skee Die cia rae 1909 9852 9683] 98.2 169} 1.73 19 13 ES Fl\s ote lersy « 
Tid. deisel < iene ee ae I909| 19091} 18617] 97.52 474| 2.48 51 32 SOM ses 
Tye a. ceeeae Tee heehee 1910 1839 1664} 90.48 WARe O52 16} 21 ie} eae cece 
Gaede ce Divers avane IQ1O 8135 6677| 82.08 1458} 17.92 160) 257 Tae aaa ee 
Diy est Liagerele sss IQII 16638 16515} 99.26 123 -74| 19) I2 OB visas 
Weld a ePeus Dia erctada a IQII 20802| 20401 98.07 401 1.93 28 14 be Sa ent Bae 
Drajet-toaa he Meet orsg state | IQI2} 11138} 10833] 97.26 305| 2.74) 14 16 ZIG aera nese 
PS Aes Dreta es | 1912 10029 9898] 98.690 I31 Tesi 13) 13 NOS. drear.acts 
| 
Grandstotallt seis nace 6 os ome 165165] 97 56) AII3| 2.44 407) 190 3516 -353 






The above tabulation shows that one spray during this period 
produced from 82.08 to 99.26 per cent of sound fruit or 
an average of 97.56 per cent for the four years, when comparisons 
are made between an equal number of plots in each year. In ex- 
planation it should be stated that the figures for several plots in 
1909 were omitted simply to give a more nearly equivalent value to 
the returns obtained for the four-year period. Attention should be 
called to the low percentages of 1910, a season remarkable for the 
unusual destructiveness of the second brood and one presenting 
infrequent conditions which were further accentuated by the small 
yield of that year. Excluding the data for 1910, the lowest per- 
centage of sound fruit obtained from one spraying was 97.52. It 
is worthy of note that only a little over 4% of I per cent (.353 per 
cent) of the wormy apples were end wormy. This, compared with 
the proportion of end wormy on the unsprayed trees, which latter 
amounts to 21.73 per cent, shows that the great reduction in wormy 
fruit was due to the destruction of the caterpillars or apple worms 
attempting’to enter the apples at the blossom end, and indicates in 
a striking manner the importance of this early spray. The contrast 
is more evident if we raise the yield of the check or unsprayed trees 
to approximately that of the sprayed trees and the other data pro 
