THE CODLING MOTH ON PEARS IN CALIFORNIA. eal 
RESULTS. 
The fruit from the 10 trees of the unsprayed check block was 95.12 
per cent wormy and only 4.88 per cent were free from worms. Plat I 
(Table XLVIII) was sprayed three times and had only 5.80 per cent 
wormy fruit, with 94.20 per cent free from worms, giving a difference 
of 88.40 per cent in the amount of fruit free from worms from the two 
plats. Plat I] (Table XLIX), which received the second and third 
applications (with the first spraying omitted, as given Plat I), showed 
28.52 per cent wormy fruit and 71.48 per cent free from worms, 
as against 14.09 per cent wormy fruit and 85.91 per cent fruit free 
from worms for Plat III (Table L), which received the first and 
third applications, with the second spraying as given Plat I. 
SUMMARY AND RECOMMENDATIONS. 
There are practically two full broods of larvee in the pear-growing 
districts of the interior counties of California. Comparatively few 
of the first-brood larve go over the winter. 
The number of first-brood larvee being relatively small, the injury 
is not so noticeable, and many growers overlook the importance of 
destroying this brood of worms to prevent the greater damage by 
the more important second-brood larve, which begin to enter the 
fruit just prior to the first picking. 
The first-brood larve begin entering the fruit about a month after 
most of the petals have fallen, though this time may vary somewhat 
with the season. All spraying for the first brood should be done 
within three to four weeks after the blossoms are off the trees. Two 
applications for this brood reduced the worms for the season from 
9.62 to 18 per cent lower than the plats sprayed once. 
Two, and preferably three, treatments are advised, using arsenate 
of lead at the rate of 4 pounds to each 100 gallons of water. The 
first application should be made as soon as most of the petals have 
fallen, and especial pains should be taken as nearly as possible to fill 
each calyx cup with the poison. A tower platform of the type 
shown in Plate III is very advantageous, because at this time many 
buds are pointing upward. The trees should be drenched. The 
second treatment should come three to five weeks after the falling 
of the petals. The third application should be given nine or ten 
weeks after the falling of the blossoms, or about two weeks before 
the first picking begins. If only two treatments can be given, the 
first and second of the above schedule should be given. 
O 
