198 THE PLUM CURCULIO. 
Orchard of the Strathmore Orchard Co.—In the Strathmore orchard, 
at Mount Jackson, the curculio was notably more abundant, and the 
results were less favorable. The orchard had been in sod for some 
years and conditions were thus favorable for the insect. All trees 
not included in the experiment were sprayed by the owners. 
The results indicate the impracticability of satisfactorily reducing 
curculio injury by spraying alone, when conditions are extremely 
favorable for the insect. Three applications protected the fruit to 
an extent of 40.82 per cent as against 27.23 per cent on the unsprayed 
trees, a gain of 13.59 per cent of the crop. Curiously, the single 
application, given to Plat II, resulted in a higher percentage of sound 
fruit than the three treatments given to Plat I, namely, 57.90, an 
increase over the check plat of 30.67 per cent. 
TaBLE XCIX.—Resullts of spraying apples for the plum curculio, Mount Jackson, Va., 1909. 
Total | , 
Total | num- eee Per. cae See 
Plat Fie ee Tree | num- | ber of = centage|“o-# 
Nat Treatment. Variety. No. | ber of | apples ber of |orcound| centage 
apples. | punc- punc- | apples ofsound 
Ilene tured. | tres apples: | apples 
1 1866::1' 15367 ||) 2,961 "| 926: 74 boos ee 
: 2} 1,308 ODEN goon) Taeneee eee see 
Three applications Bordeaux mix- 3:4) 35466 1) 16315) 8067)" 52.04 ee 
I ture (1-1-50) plus 2 pounds ar- BenkDanis 4 708 441 OBZ Orla Meee 
Faia senate of lead, May 6-7, 28-29, oe Sil) A660 a 2575 SOLS |) 24209n hoses 
July 8-9. 67) 35486-25197 4 0404) AR Oise 
7 1,063 612 1,486 4D. AD heer 
8 |) 2;429 "| 1,382 | 2.869)" 48:30 sess 
16,293 | 9,642 | 20,759 }.....--- 40. 82 
1 3,827 1,507 2, 782 60: .62)\bess eee 
One spraying only, with arsenical. 21 8,657) 788) 2,800) |) Slaton eaeeeee 
Drenched with arsenate of lead, 3 675 303 633i) soba eee 
Tl 2 pounds to 50 gallons of water, ale 4 989 494) 103241) B00b) eee eee 
Ste May 6-7. Bordeaux mixture |{[---~  ~-"~~~ 5} 1,679 754 | 1,449°| 55.09 |: -2--- 22 
only (2-2-50), applied May 28-29 6 3, 480 1,212 2,159 65c17 aes 
and July 8-9. 7 969 447 O87, |. 58.805 |seeaceee 
8 {| 4,299 | 1,785 | 3,153 | 59.64 }.......- 
19,5755 (8, 240913995) | eee en ee 57. 90 
uy 3,926 8,186 7,336 LS. 84 0b eee 
2 3,109 2, 226 4,497 28:40 |b seen 
3 1,840 1,079 2,212 Al, S65 | beac 
4 1,508 1,226 2,888 18269) Bees. cer 
III...) Unsprayed.......-.------+------+-[----- do...... Ble Se80))|) 239905030. | meee ca | ema 
6 4,153 2,823 6,122 32h 08H oseaacs 
7 5,121 3,611 8,779 29; AS: Pcmmer ae 
8) 25795.) 2 107.)|) -4,904)|) 2461) | Peeeeees 
EXPERIMENTS AT ST. JOSEPH, MO. 
The work at St. Joseph also formed part of a demonstration sched- 
ule of spraying in comparison with the one-spray method. The 
orchard used had been in sod for some years, and no spraying had 
been done. Conditions were especially favorable for the insects, 
and, as shown by the tabulated results below, the injury under these 
conditions was very severe. The crop, moreover, was light by reason 
