ONE-SPRAY METHOD FOR CODLING MOTH, ETC. 137 
THE PLUM CUROULIO. 
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 
curculio on this plat is not understood. 
TaBLeE XVIII.—IJnjury oe the vem curculio for entire season, Plats XIII, X V, and 
Mount Jackson, Va., 1909. 
PLAT XIII. DEMONSTRATION. 
Number of punctured and sound apples, etc., per 
tree in each plat. Total 
Total er cent 
for Tuit free 
Tree | Tree | Tree | Tree | Tree | Tree | Tree | Tree | Plat- from 
ils 25 oe 4. 5. 6. Us 
8. injury. 
INOS DUNC HUTES eee sea ceaett e 2,961 |2,391 |3,067 | 932 |3,013 |4,040 /1,486 |2,869 | 20,759 |.......... 
Nosinistpunctureds self 2s. foros. 1,367 "755 1,631 441 |1,257 |2,197 | 612 |1,382 hi dal SSSIee 6 
INoasotndiriibe sos. ose eee: 499 | 553 |1,8385 | 267] 410 1,589 | 451 |1,047] 6,651 |.......... 
IM Qs finn eee pie eet ae erefeiolin ara 1,866 |1,308 |3,466 | 708 |1,667 |3,786 |1,063 |2,429 | 16,293 |.......... 
Le en 40. 82 
Per cent free from injury.......... 26.79 |42.27 \52.94 133.71 |24.58 |41.97 |42. 42 43.10 
PLAT XV. ONE SPRAY. 
INO. PUNELUTCS 22. = o)2e acess =n0 2) 2,782 |1,800 | 633 1,032 |1,449 |2,159 | 987 13,153 
No.fruit.piunetured)........ 2.00 1,507 1,788 | 303 | 494] 754 |1,212 | 447 /1,735 
INO. sounatiruitsscc: con oe soe oreo 2; 320 |1,869 | 372 | 495 | 925 |2,268 | 522 |2,564 ‘ 
INO Sn er oe ey etaga ord wis once as 3,827 |3,657 | 675 | 989 1,679 |3,480 | 969 |4,299 | 19,575 |.......... 
Per cent free from injury.......... 60.62 |51.10 |55.11 (50.15 [55.09 (65.17 \03. 86 |59.64 |........ 7.90 
| 
PLAT XVII. UNSPRAYED. 
INONPUNCHITES: «6b ncncisceiaccrecies 7,336 |4,497 |2,212 |2,888 |5,030 |6,122 |8,779 |4,904 | 41,768 |.......... 
Nosiruit punctured. .2-2:.5.2..... 3,186 |2,226 |1,079 |1,226 |2,399 |2,823 |3,611 |2,107 | 18,657 |.......... 
NOL SOUNG frites sere oles cee ncoek 740 | 883 | ’761 | 282 | '790 1,330 |1,510 | 688 Gy 982) ea. 
INO See aye eae ORE emmeE < 3,926 |3,109 |1,840 1,508 |3,189 |4,153 |5,121 |2,795 | 25,641 |........-. 
Per cent free from injury.......... 18.84 |28.40 |41.35 |18.61 |24.77 [32.04 [29.46 |24.61 |........ 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 
