THE CODLING MOTH ON PEARS IN CALIFORNIA. 41 
Taste XXXV.—Degree of infestation and relative infestation at different places of 
entrance by codling-moth larve. Plats I-IV, Suisun, Cal., 1910. 
. . Relative infestation at differ- 
Degree of infestation. ent places of entrance. 
Total 
Total 
: number Total per : | Percent- 
Plat. HIDE: of wormy| Total per apie com cent of A ae P ae age of 
om pears. | pears. | cent of pears ace worms 
pears = of worms| worms F 
wormy | worm wornty at (100 per | entering entering 
pears. | 4+ cal a side and ata aii pales at side 
yX- | stem. ns os | and stem. 
Plat I, sprayed Apr. 
6, May 4, and June | 
(Ge Se Aco eae 7, 290 423 5.80 1.783 4. 019 423 30.73 | 69. 27 
Plat II, sprayed May 
5 and June 1625-222 6,538 1, 865 28. 52 19. 270 9, 250 1,865 67.56 32. 44 
Plat Il], sprayed 
Apr.7and June 17. 6,381 899 14. 09 6. 065 8. 024 899 43.05 56. 95 
Plat IV, unsprayed 
(Cite ees Arges os aoe 5, 941 5, 651 95. 12 89. 143 5.975 5, 651 93. 72 6. 28 
Taste XXXVI.—Degree of infestation and relative infestation at different places of 
entrance by codling-moth larve. Plats I to ITI, inclusive, Concord, Cal., 1909. 
ore F Relative infestation at differ- 
Degree of infestation. ent places of entrance. 
Total is “Mon 
Total . 
Plat. number. sien Percent | Total | Percent- | E esi 
of pears. ciy een Per cent rer ceny of pears | number | ageof | 38° of 
Ee * Jof wormy tees wormy at} of worms) worms | Puan 
pears. | ot calyx side and | (100 per | entering aE 
° stem. cent). | at calyx. Vedictoun 
Plat I, sprayed Apr. 
17, May 10, and | 
INGO E 5 Se eee =e 13, 219 379 2. 86 0. 938 1.929 379 | 32.72 67.28 
Plat II, unsprayed | | : 
Checks sees = 2 14, 290 7,581 53.05 39. 181 13. 869 7,581 73. 86 26. 14 
Plat III, sprayed 
Apr. 18and June29.| = 13, 943 1,731 12. 415 7.954 4.461 1,731 | 63.97 | 36. 03 
t 
For the best results in obtaining fruit free from worms, it is desir- 
able to spray three times, but if only two applications can be put on, 
the two early treatments give far better results than any other two 
sprayings. 
COMMERCIAL RESULTS FROM SPRAYING. 
Contra Costa County, 1909. 
The 15-acre Bartlett pear orchard belonging to Mr. George Whit- 
man and located in the central part of Ygnacio Valley, Contra Costa 
County (see Plate ITI), was used for this work in 1909. The trees 
are large and well cared for, comparing favorably with the average 
California pear orchard. 
The larger part of the orchard was included in Plat I as a demon- 
stration. Four rows across the middle of the orchard were left 
unsprayed for comparison. Plat III consisted of six rows across 
the north end of the orchard. 
