THE CODLING MOTH ON PEARS IN CALIFORNIA. 41 
TABLE 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 cee Total Percent 
Fe | number : otal per : ercent- 
Plat. | oe of wormy| Total per Tatal per nee Total | Percent- age of 
| of pears. | ars! cent of cent of pears number age of wane 
1s pears ~,,/0f worms | worms ; 
wormy , | wormy at) - entering 
wormy . (100 per | entering | ~, <; 
pears. | a+ calyx side and cent) at calyx at side 
Sante Stem. 5 m7 ~ | and stem. 
Plat I, sprayed Apr. 
6, May 4, and June 
12 eee ees eee 7,290 423 5. 80 1.783 4. 019 423 30.73 69. 27 
Plat IL Speyer May 
5 and June 16...... 6,538 1, 865 28. 52 19. 270 9. 250 1, 865 67.56 32.44 
Plat III, sprayed 
Apr. 7andJune 17. 6, 381 899 14. 09 6. 065 &. 024 899 43.05 56.95 
Plat IV, unsprayed 
OG Ke fase ong ooe 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 IIT, inclusive, Concord, Cal., 1909. 
: P Relative infestation at differ- 
Degree of infestation. ent places of entrance. 
Total 7 | ae ee 
Total 
Plat. number. somber Bar aan Per cent Total | Percent- vere 
of pears. aie Y\ Per cent A WERE of pears | number age of sc Sas 
Ie * \of wormy ere wormy at) of worms | worms | Stan. 
| | Pears. | at calyx side and | (100 per | entering ap ade 
* stem. | cent). | at calyx. | srisl ign 
Plat I, sprayed Apr. 
17, May 10, and 
Uti GoR see See 13, 219 379 2.86 0. 938 1.929 379 32.72 67.28 
Plat II, unsprayed 
Gheeless o=s 553503 14, 290 7,581 | 53.05 39. 181 13. 869 7,581 73. 86 26. 14 
Plat III, sprayed 
Apr. 18 and June 29. 13, 943 1,731 12. 415 7.954 4.461 1,731 63. 97 36. 03 
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. 
ContTRA Costa County, 1909. 
The 15-acre Bartlett pear orchard belongmg to Mr. George Whit- 
man and located in the central part of Ygnacio Valley, Contra Costa 
County (see Plate IIT), 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. 
