196 THE PLUM CURCULIO. 
EXPERIMENTS AT SILOAM SPRINGS, ARK. 
In the one-spray versus demonstration treatments for the codling 
moth and apple diseases at Siloam Springs in 1909 special attention 
was given to determining the effect of these treatments on the cur- 
culio. The results from only Plats I, [V, and V are given as consti- 
tuting the principal features of the work. The orchard was an 
isolated one and contained 344 trees and was divided into five plats. 
There was a miscellaneous assortment of varieties, but principally 
Ben Davis, on which variety all counts were made. The treatments 
which the respective plats received are shown in Table XCVII. 
Plat I shows an increase in uninjured fruit over the unsprayed plat 
(Plat V) of 77.20 per cent, and there is a difference in favor of Plat 
IV of 3.74 per cent of sound fruit. It will be noted that one drench- 
ing spray in this instance gave somewhat better results than five 
applications, though this condition is probably to be accounted for 
by reason of the proximity of Plat IV to the check plat. 
Taste XCVII.—Results of spraying apples for the plum curculio, Siloam Springs, 
Ark., 1909. 
Total ? > Average 
Plat Tree | Total | number ie E a percent- 
2 Treatment. Variety. ‘| number | of apples as age of 
No. No. of pune- | sound 
ofapples.| punc- aes sound 
Fareds tures. apples. apples 
1 5, 689 1, 179 1,979 rit Pe-{ il eee 
One spraying only with - ee ne a te a ae rere bea 
arsenical; drenched 4 2 750 387 ” 683 ahs ll (ela ae 
with arsenate of lead, 5 3) 446 208 268 aac05 CM eae 
1 pound to 50 gallons “ ; uaae Be Beal ia ea " 
Weare c a Ben Davis.. 6 3, 768 532 1,012 85 88) aaoseee oe 
water, Apr. 24-25; Bor- 7 3° 307 370 638 88. 81 
deaux mixture only 3 5 4 43 706 1 200 Sr pol ee 
(44-50) May 25-26, 9 3, 644 364 642 90 sO1 a aoe es 
July 2. 10| 23.652 216 ATH PREC |Rn cee 
11 8, 895 335 642 OLSON | ee eee 
43, 203 5,899 Wel es eeonpac 86. 34 
1 3,536 746 1,293 48590) |neicrere eis.ereve 
2 1, 890 301 562 84.07 lncemeaooes 
Five applications Bor- 7 aie oh ue ae Be Seca 
deaux mixture (3-3-50) 5 3’ 145 266 430 91. 54 Peniaieiccisieis 
IV plus 2 pounds arsenate Go 6 e 663 200 432 87. 98 gee cece 
F of lead: Apr. 24-25, sae ss eit 2 9’ 496 498 1.025 90,04 eee 
May 25-26, July 2, 8 3172 467 877 so ece ee 
July 22, Aug. 10. 9| 4701 || 4j686))  -S)layr| Pa Beet eee ee 
10) 1,957 140 254 OD) BA lees ASS eae 
il | 3,058 769 1, 429 TA BoA seh Beets 
| 32,451 5,554 10,302 
| = 
i) 2,560 2,130 6, 623 
2 1,701 1,595 6, 230 
3 995 948 4,331 
4 1,538 ia2e 10,068 
5 | 1, 206 999 3,372 
6 2,501 2,299 9,527 
Vieoae | UmSprayeds. oo -.:-ssesslsoces Osea s2= 7 2,821 2,724 14, 727 
8 1,156 1,070 4,714 eae 
9 2,323 1, 936 6, 143 G65) | ezeecceeame 
10 2,258 2, 117 8, 707 6.24 | ccs caeeee 
i 1,719 1,605 6, 921 663) (see 
12 1,608 1,517 5,984 DHOON ocean eae 
13 2,060 1,750 6, 739 15304 a eee 
24, 446 22,212 94,086 |...-.<-... 9.14 
