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. 
Taste XLVIII.—Sound and wormy fruit from 10 trees of Plat I, sprayed three times, 
pear orchard of Mr. G. W. Langdon, Suisun, Cal., 1910. 
Number of windfallen | Number of pears from 
pears. Feces Total number. Per cent— 
Tree No. = de 
| Total. Wors. Sound.| Total.|Wormy. |Sound.| Total.| Wormy. |Sound.|Wormy. |Sound. 
143 124 962 36 926 | 1,105 55 | 1,050 4.98 | 95.02 
97 8 89 599 15 584 696 23 673 3.30 | 96.70 
77 6 71 685 11 674 762 17 745 2.23 | 97.77 
37 6 31 422 16 406 459 22 437 4.79 | 95.21 
110 14 96 666 12 654 776 26 750 3.35 | 96.65 
101 12 89 553 9 544 654 21 633 3. 21 96. 79 
184 22 162 | 1,094 37 | 1,057 | 1,278 59 | 1,219 4.62 | 95.38 
103 30 73 425 39 386 528 69 459 13. 07 86. 93 
59 13 46 221 30 191 280 43 237 15.36 | 84.64 
100 | 29 71 652 59 593 752 88 664 11.70 | 88.30 
Total, trees | | if 
TO eee | 1,011 159 852 | 6,279 264 | 6,015 | 7,290 423 | 6, 867 | 5.80 | 94.20 
