ONE-SPRAY METHOD FOR CODLING MOTH, ETC. 145 
The plum curculio, it will also be noted, was not especially destruc- 
tive at Saugatuck, Mich., during the season of 1909, the unsprayed 
trees showing 87.42 per cent of fruit free from injury. Nevertheless 
the demonstration and one-spray plats show a fair benefit, but the 
difference in the amount of fruit free from injury between these two 
plats, namely, 1.23 per cent, is not important. 
SUMMARY STATEMENT OF RESULTS. 
For the purpose of more ready comparison, the percentages of fruit 
free from codling-moth and plum-curculio injury on the one-spray, 
demonstration, and unsprayed plats, from the several localities, are 
tabulated in Table XX. The average percentage of fruit free from 
these insects for the four orchards gives for the one-spray method 
91.46 per cent as against 96.57 per cent for the demonstration treat- 
ment, a gain in favor of the latter of 5.11 per cent. Comparing the 
final average of percentage of fruit free from the plum curculio, there 
is seen to be a gain in favor of the demonstration treatment of 6.27 
per cent. 
TABLE XX.—Percentages of fruit free from injury by the codling moth and plum curculio 
on one-spray, demonstration, and uns prayed plats in Arkansas, Virginia, and Michigan, 
in 1909. 
Codling moth. Plum curculio. 
Locality. 
One Demon- Un- One Demon- Un- 
spray. | stration. | sprayed. | spray. | stration. | sprayed. 
Siloam Springs, Ark. .--......0..... foanse 92.76 98. 12 66.74 86. 34 82. 88 8.85 
Crozet. View cacs soosess cosiciee 84.07 94.13 53.02 73. 93 86.89 54. 02 
Mount Jackson, Va 91. 68 92.74 54. 00 57.90 40. 82 27.23 
DAU SACK MICH nee s os See eis csiaee oc 93. 61 97. 66 77.79 97.54 98.77 87.42 
Average of four localities. ........... | 91.46 96. 57 65. 14 77.10 83. 37 49.17 
Table X-XI presents in comparison the effect of treatments for the 
four orchards, on the places of entrance of the fruit by the larve. 
The figures given are percentages of total larvee for the season enter- 
ing fruits at the calyx, side, and stem, respectively, for the one-spray, 
demonstration, and unsprayed plats. The average for the four 
orchards is interesting, especially in respect to calyx entrance, which 
on the one-spray plat is 7.67 per cent and on the demonstration plat 
is 15.29 per cent, a lessening of calyx entrances of 7.62 per cent by 
the drenching-spray method. The proportion of larve entering fruit 
at the calyx end under normal conditions is evidently about that 
shown for the unsprayed plats, the final average being 68.17 per cent, 
including both first and second broods. 
