ONE-SPRAY METHOD FOR CODLING MOTH, ETC. 137 
THE PLUM CURCULIO. 
The plum curculio proved to be unusually destructive in the 
Strathmore orchard, which had not been plowed for at least two 
years and had grown up in grass and sod. The results of the respec- 
tive treatments in the control of this insect are shown in Table XVIII, 
and as will be noted the percentage of fruit free from curculio injury 
is in all cases comparatively low. Nevertheless the one-spray treat- 
ment shows a gain of 17.08 per cent of fruit free from injury over the 
demonstration treatment, and a gain of 30.67 per cent of fruit free 
from injury over the unsprayed trees. The location of the trees in 
the respective plats does not indicate a more favorable place as 
regards liability to curculio injury for the one-spray block and the 
notably higher benefit of the single treatment in the control of the 
eurculio on this plat is not understood. 
TaBLeE XVIII.—Injury by the plum curculio for entire season, Plats X IIT, X V, and 
XVII. Mount Jackson, Va., 1909. 
PLAT XIII. DEMONSTRATION. 
Number of punctured and sound apples, etc., per 
tree in each plat. Total 
Tree | Tree | Tree | Tree | Tree | Tree | Tree | Tree | Plat. Pe 
DE eer een Ue. | Gs eter. It OSs yay 
- -|2,961 |2,391 |3,067 | 932 |3,013 |4,040 |1,486 |2,869 | 20,759 |.......... 
\1,3867 | 755 |1,631 | 441 |1,257 |2,197 | 612 /1,382 | 9,642 |.......... 
499 | 553 (1,835 | 267 | 410 |1,589 | 451 |1,047 | 6,651 |.......... 
1, 866 1,308 3,466 | 708 |1,667 |3, 786 |1,063 |2,429 | 16,293 |.......... 
- -|26. 79 peat 52.94 |33.71 |24.58 |41.97 |42.42 |43.10 |........ 40. 82 
No. punctures... .. 
No. fruit punctured 
Per cent free from injury - . 
PLAT XV. ONE SPRAY. 
INO job boteinb ives eae eoseeeessoe-seeee 2,782 |1,800 | 633 |1,032 |1,449 |2,159 | 987 |3,153 | 13,995 |.......... 
No. fruit punctured........-..-.-- 1,507 |1,788 | 303 | 494} 754 |1,212 | 447 |1,7385 | 8,240 |.......... 
Nomsound truitsce: 2-80 520-2 =n eee 2,320 |1,869 | 372 | 495 | 925 |2,268 | 522 |2,564 | 11,335 |.......... 
INOSINULGAE ee see aces cee tes 3,827 |3,657 | 675 | 989 |1,679 |3,480 | 969 [4,299 | 19,575 |.......... 
Per cent free from injury.......... ae poe 55.11 }50.15 |55.09 |65.17 |53.86 |59.64 |........ 57.90 
PLAT XVII. UNSPRAYED. 
| 
INOM PUNGENT eSsepe ase yS-ea 2 =< as 7,336 |4,497 |2,212 '2, 888 5,030 |6, 122 
8,779 |4,904 | 41,768 |.........- 
No. fruit punctured.........-....- 3,186 |2,226 |1,079 |1,226 |2,399 |2,823 |3,611 |2,107 | 18,657 |.......... 
MNonsand ttle: 0 0..-.0-2-ccc0 740 | 883] 761 | 282] 790 [1,330 [1,510] 688| 6,984|.......... 
Oech) sa a a 3,926 [3,109 |1,840 [1,508 [3,189 /4,153 5,121 |2,795 | 25,641 |.......... 
18.61 |24.77 [32.04 |2 
Per cent free from injury.......... 18. 84 |28. 40 iene -46 (24.61 eaeaaes 27.23 
| 
EXPERIMENTS IN MICHIGAN. 
The experiments in Michigan were carried out in the vicinity of 
Saugatuck, in the orchard of Mr. E. H. House. The location of the 
plats in the orchard and of the count trees in the respective plats 
is shown in figure 37. The size of the trees is illustrated in Plate 
XI, figure 2. This orchard included trees of the Wagener, Ben Davis, 
and Baldwin varieties, and an equal number of trees of each variety 
was used for counts in the respective plats. As in the work else- 
where, all drop-fruit during the season, as well as that from the trees 
