THE CODLING MOTH ON PEAKS IN CALIFORNIA. 



45 





First 



Second 





Plat No. 



spraying, 



spraying, 



Third spraying, July 4. 





Apr. 9. 



May 2. 





I 



XX 



XX 



XX (demonstration). 



II 



XX 



XX 



Omit. 



III 



XX 



Omit 



XX. 



IV 



Omit 



XX 



XX. 



V 



Omit 



Omit 



XX. 



VI 



Omit 



Omit 



Omit (check). 



VII 



XX 



Omit 



Omit. 



VIII 



Omit 



XX 



Omit. 





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. 



Table XL. — Sound and wormv 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. 



Tree No. 



Number of windfallen 

 pears. 



Number of pears from 

 trees. 



Total number. 



Per cent — 





Total. 



Wormy. 



Sound. 



Total. 



Wormy. 



Sound. 



Total. 



Wormy. 



Sound. 



Wormy. 



Sound. 



1 



28 

 8 

 28 

 19 

 15 

 18 

 34 

 69 

 30 

 12 



1 

 3 

 1 

 2 

 3 

 2 

 8 

 6 

 2 



1 



27 

 5 

 27 

 17 

 12 

 16 

 26 

 63 

 28 

 11 



411 

 143 

 364 

 218 

 138 

 232 

 459 

 301 

 381 

 218 



9 



7 



5 



4 



6 



7 



21 



19 



15 



4 



402 

 136 

 359 

 214 

 132 

 225 

 438 

 282 

 366 

 214 



439 

 151 

 392 

 237 

 153 

 250 

 493 

 370 

 411 

 230 



10 



10 



6 



6 



9 



9 



29 



25 



17 



5 



429 

 141 

 386 

 231 

 144 

 241 

 464 

 345 

 394 

 225 



2.28 

 6.62 

 1.53 

 2.53 

 5.88 

 3.60 

 5.88 

 6.76 

 4.14 

 2.17 



97.72 



2 



93. 38 



3 



98.47 



4 



97.47 



5 



94. 12 



6 



96.40 



7 



94. 12 



8 



93.24 



9 



95. 86 



10 



97.83 







Total, trees 

 1-10 



261 



29 



232 



2,865 



97 



2,768 3,126 



I 



126 



3,000 



4.03 



95.97 



