. 
THE CODLING MOTH ON PEARS IN CALIFORNIA. 45 
First Second 
Plat No.| spraying, | spraying, | Third spraying, July 4. 
Apr. 9. May 2. 
I XX.....:| XX......| XX (demonstration). 
Il OX ae =|) XOX ee) (Omit. 
Ill PRE eee Omits5-|) XOX: 
IV Omit see) exe XX. 
Vv Omits--=|) Omit-255:|| SEx- 
VI Omitse.-- Omit....-| Omit (check). 
Wil RON ee) Ome a=) Omit: 
Vill Omit... - oN a5.) cOmitt 
XX=Sprayed. 
Omit=Unsprayed. 
The codling moth had been very abundant in this orchard for 
several years, frequently occurring in such numbers that 90 per cent 
or more of the fruit was infested. The unsprayed plat this year had 
93.90 per cent wormy fruit. The same outfit was used this year as 
was used in the Whitman orchard in 1909 and the same materials, 
namely, arsenate of lead, except that half of each plat was sprayed 
with arsenate of lead at the rate of 6 pounds to each 100 gallons of 
water and the other half with arsenate of lead at the rate of 4 pounds 
to each 100 gallons of water at each application. Five of the ten 
trees selected for records were taken from each half of the blocks and 
the records kept separately throughout the season. No consistent 
differences could be found and it is quite evident that 4 pounds of 
arsenate of lead is as efficient as 6 pounds for each 100 gallons of 
water. All spraying was done thoroughly and, so far as possible, all 
the calyx cups on those plats receiving the first application were well 
filled with spray. The results showing the sound and wormy fruit 
from the eight plats are given in Tables XL to XLVII. The 
windfalls were gathered and examined once each week. 
TaBLeE XL.—Sound and wormy fruit from 10 trees in Plat I, sprayed three times, pear 
orchard of the Mrs. Fanny W. Bancroft Orchard Co., near Walnut Creek, Cal., 1910. 
Number of windfallen | Number of pears from 2 
pears. ees Total number. Per cent— 
Tree No. 
Total. | Wormy.|Sound.| Total. | Wormy./Sound.| Total.| Wormy.|Sound.| Wormy.|Sound. 
Mere ates =e. 28 1 27 411 9 402 439 10 429 2.28 | 97.72 
DE ee pa 8 3 5 143 7 136 151 10 141 6. 62 93. 38 
Deists cpanel e's 28 1 27 364 5 359 392 6 386 1. 53 98. 47 
Ae ce msilses - = 19 Z 17 218 4 214 237 6 231 2.53 | 97.47 
Oe Seer ae aaeeae 15 3 12 138 6 132 153 9 144 5.88 | 94.12 
eee ee 18 2 16 232 o 225 250 9 241 3.60 | 96. 40 
(SSS eneer 34 8 26 459 21 438 493 29 464 5.88 | 94.12 
Bic cis ome sl 69 6 63 301 19 282 370 25 345 6.76 | 93.24 
ats eae e 30 2 28 381 15 366 411 17 394 4.14] 95.86 
ser > see eo 12 1 11 218 4 214 230 5 225 2.17 | 97.83 
Total, trees iz 
TS UOUS ee 2/5- 261 29 232 | 2,865 97 | 2,768 | 3,126 126 | 3,000 4.03 | 95.97 
