CONTROL OF CODLING MOTH IN COLORADO. 33 
to hatch. The next and last application should be made 34 to 36 
days later, in advance of the hatching of the second-brood larve in 
maximum numbers and for protection against the third-brood larve. 
Schedule IT is similar to schedule I except that five cover sprays 
are used instead of four, the additional application being made for 
the first-brood larve. The second cover spray should be applied 
10 to 12 days after the previous treatment so as to cover the fruit 
just in advance of the hatching of the first-brood larve in large num- 
bers. The next application should be made 10 to 12 days later as a 
means of protection against the late hatching first-brood larve. 
Schedule III includes a total of seven applications, the first four 
being similar to those of schedule Il. But in schedule III, three 
applications should be made for the second and third broods, the first 
of which should be applied 9 to 10 weeks after the calyx treatment, 
previous to the hatching of the second-brood larve. The next 
application should follow in 24 to 26 days, just before the hatching 
of the second-brood larve in large numbers and the last should be 
applied 15 to 17 days later, for late hatching second-brood larve and 
protection against worms of the third brood. 
AVOID PRESENCE OF SPRAY RESIDUE ON HARVESTED FRUIT. 
Orchardists understand the importance of and will naturally give 
attention to the carrying out of any spraying schedule in such a 
manner as to obviate as completely as possible the presence of spray 
residue on fruit prepared for the market. Such residue is objection- 
able to consumers, and while there is little chance of injury resulting 
from its use, there is no necessity under average conditions to spray 
to an extent that results in much spray on the fruit at harvest time. 
A heavy coat of spray residue at harvest time is frequently due to 
an attempt on the part of the grower to protect his nearly ripened 
fruit from an abundance of late hatching worms. This condition 
would not be so common or serious if the proper action and same 
amount of endeavor were directed against the elimination of the first- 
brood worms. | 
During certain seasons of unusual worminess or with particularly 
susceptible varieties, seven treatments may not always give the 
desired results, but. it is believed that in most instances seven 
thorough, well-timed applications will give as good results as can be 
economically obtained in the Grand Valley. 
The foregoing schedules are based on the general average life his- 
tory of the codling moth in the Grand Valley under normal climatic 
conditions. Butif there should occur any unusual departure from the 
normal, a corresponding variation in the development of the insect 
is to be expected, and the schedule of applications should be modified 
accordingly. Small deviations, however, should not cause the fruit 
