ONE-SPRAY METHOD FOR CODLING MOTH, ETC. 137 
tive treatments in the control of this insect are shown in Table XV, 
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 XV.—Injury by the plum curculio for entire season, plats X III, X V, and X VII. 
Mount Jackson, Va., 1909. 
PLAT XIII. DEMONSTRATION. 
Number of punctured and sound apples, ete., per 
tree in each plat. | Total 
Total | per cent 
for | fruit free 
Tree | Tree | Tree | Tree | Tree | Tree | Tree | Tree | Plat. | foes 
ft De 3s Ae Sle Ganltee pes: [VEE 
ING mDUNCHUITeS == ce. ect ccs |2,961 |2,391 |3,067 | 932 |3,013 |4,040 |1,486 |2,869 | 20,759 |.........- 
No. fruit punctured........--..-..- 1,367 | 755 |1,631 | 441 |1,257 |2,197 | 612 |1,382 | 9,642 |........_. 
ONG SOUUMOEN ULES Se arose aro arnico terse 499 | 553 |1,835 | 267 410 |1,589 | 451 |1,047 6,650: |P ae 
NGwpnititmeree te. seco ete fs eae 1,866 |1,308 |3,466 | 708 {1,667 |3,786 |1,063 |2,429 | 16,293 |.........- 
Per cent free from injury.......-... 26.79 |42.27 |52.94 |83.71 |24.58 |41.97 [42.42 /43.10 }........ | 40. 82 
PLAT XV. ONE SPRAY. 
NON muUnCtUrES= <2. aces = aceon 2,782 {1,800 | 633 |1,032 |1,449 |2,159 | 987 |3,153 | 18,995 |.......... 
Not init punctured: ----.--5--+:-- 15507) 1788) 303) | 494) 754) 219) 447 10-735 | 98,240) | 222) ose 
NDA SOUNG Tuts; --cecse cee cesses |2,320 |1,869 | 372 | 495 | 925 |2,268 | 522 |2,564 | 11,335 |.........- 
INOS Indita-2s5--- 2224-5. -8=-s------ 8,920 [3,607 || 675) 989) |1,.679' 13,480 |, 969" |45.299) || 19.575) |. =... - 2.5. 
Per cent free from injury ......-.-- as 62 |51.10 |55.11 |50.15 (55.09 |65.17 [58.86 [59.64 |........ 57.90 
PLAT XVIII. UNSPRAYED. 
Wovgpanetuites...--ec<k-e2e00--. 7,336 |4,497 [2,212 |2,888 |5,030 |5, 12: 
}, 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 |..-.._.... 
Worsound artiten.2+55o- sees 740 | 883 | 761} 282 790 |1,330 |1,510 | 688 | 6,984 |.......... 
IN OMIEUIU eH) ec se mle nicis seine cece {3,926 |8, 109 |1,840 |1,508 /8,189 |4,153 [5,121 |2,795 | 25,641 |.......... 
41.35 18.61 |24.77 |82.04 |29.46 24.61 |........ 27.23 
Per cent free from injury...---....- 18.84 |28. 40 
| | 
4 
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 
at picking time, was taken into account and classified as to injury or 
otherwise. Also the work of the two broods of the codling moth was 
