THE CODLING MOTH ON PEARS IN CALIFORNIA. 



49 



PROFITS. 



From the 10 trees of Plat I, 2,768 pears free from worms, or 18.45 

 boxes, were picked, which at the average net price of 80 cents per 

 box gives $14.76, or $1.47 per tree, which represents about $147.60 

 per acre. To this should be added $5.60 which represents the value 

 per acre of the windfalls and wormy fruit from the trees of Plat I, 

 giving a total of $153.20. 



The 10 trees in Plat VI, the unsprayed check, yielded only 42 

 pears, or 0.28 box free from worms at picking time. This at 80 cents 

 per box gives 22 cents for the 10 trees, or approximately $2.20 per 

 acre. There were, after July 15, 1,032 windfalls and wormy pears 

 picked from the trees, which represent a cash value of $4.52 for the 

 10 trees, or $45.20 per acre, giving a total return of $47.40 per acre 

 for the fruit from the unsprayed portion. Subtracting this from the 

 value of the crop per acre of Plat I gives a difference of about $100 

 in favor of spraying. Substracting from this $6.50, the cost of spray- 

 ing per acre, gives $93.50 net gain per acre due to spraying. 



Experiments in Solano County, 1910. 



A large pear orchard belonging to Mr. G. W. Langdon and located 

 near the upper end of Suisun Valley at Suisun, CaL, consists of very 

 old and large trees, and in recent years a very small portion of the 

 fruit has been merchantable in the green state, due to the high infes- 

 tation by the codling moth. The larger part of the orchard was 

 sprayed three times. Three other blocks of about 70 trees each were 

 used to test the relative value of the first and third applications and 

 the second and third applications with the plat receiving the three 

 applications and one of the plats was left unsprayed for check and 

 comparison. The results showing sound and wormy fruit from each 

 plat are given in Tables XLVIII to LI. 



Table XLVIII. — Sound and wormy fruit from 10 trees of Plat I, sprayed three times, 

 pear orchard of Mr . G. W. Langdon, Suisun, 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 



143 



97 



77 



37 



110 



101 



184 



103 



59 



100 



19 



8 



6 



6 



14 



12 



22 



30 



13 



29 



124 

 89 

 71 

 31 

 96 

 89 



162 

 73 

 46 

 71 



962 

 599 

 685 

 422 

 666 

 553 

 1,094 

 425 

 221 

 652 



36 

 15 

 11 

 16 

 12 

 9 



37 

 39 

 30 

 59 



926 

 584 

 674 

 406 

 654 

 544 

 1,057 

 386 

 191 

 593 



1,105 

 696 

 762 

 459 

 776 

 654 



1,278 

 528 

 280 

 752 



55 

 23 

 17 

 22 

 26 

 21 

 59 

 69 

 43 

 88 



1,050 

 673 

 745 

 437 

 750 

 633 



1,219 

 459 

 237 

 664 



4.98 



3.30 



2.23 



4.79 



3.35 



3.21 



4.62 



13.07 



15.36 



11.70 



95 02 



2 



96 70 



3 



97.77 



4 



95 21 



5 



96 65 



6 



96 79 



7 



95 38 



8 



86 93 



9 



84 64 



10 



88 30 







Total, trees 

 1-10 



1,011 



159 



852 



6,279 



264 



6,015 



7, 290 



423 



6, 867 



5.80 



94.20 



