ORCHARD INSECTS OF THE PACIFIC NORTHWEST 



71 



at that time. Delayed dormant and "pink" sprays may also be 

 necessary, especially if scab or mildew is to be combated. On account 

 of the prevalence of the codling moth, summer spraying of apple and 

 pear trees should follow a definite schedule. Suggested schedules are 

 given in tables 3 and 4, and the individual grower must determine from 

 his own experience and that of others which schedule to follow. It is 

 not often necessary to apply separate sprays during the summer for 

 other insects, since these may be ordinarily controlled by modifying 

 the schedule for the codling moth. For example, nicotine sulphate 

 and oil emulsion will control a number of other insects, and this com- 

 bination may be substituted for almost any of the cover sprays, as it 

 also constitutes an excellent control for the codling moth. In this 

 manner the cost of additional sprays is avoided. 



Table 3. — Codling moth spray schedules for apples in the Pacific Northwest 



Schedule 



Spray 



Time of application 









Schedule 2 (2 sprays) „ 



do 



Do. 













When most petals have fallen. 









3. Second-brood cover spray. _ . . 



6 or 7 weeks after 2. 





1. Calyx spray 











3. Second cover spray . . 



2 weeks after 2. 













When most petals have fallen. 













8 to 10 days after 2. 







16 to 20 days after 2. 





5. Fourth cover spray . 



6 to 7 weeks after 2. 



Schedule 6 (6 sprays) 





When most petals have fallen. 





2. First cover spray_ .. . - 



2 to 3 weeks after 1 . 







8 to 10 days after 2. 







16 to 20 days after 2. 





5. Fourth cover spray. - 



6 to 7 weeks after 2. 







10 to 11 weeks after 2. 



Schedule 7 (7 sprays). .. 





When most petals have fallen. 





2. First cover spray 



3. Second cover spray 



4. Third cover spray ... ._. 



2 to 3 weeks after 1. 

 8 to 10 days after 2. 

 16 to 20 days after 2. 







24 to 30 days after 2. 





6. Fifth cover spray.. .-. .______. 



6 to 7 weeks after 2. 





7. Sixth cover spray. . ..... 



10 or 11 weeks after 2. 









Table 4. — Codling moth spray schedules for pears in the Pacific Northwest 



Schedule 



Spray 

 1 . Combined calyx and cover spray 



1. Calyx spray 



2. Cover spray 



1. Calyx spray 



2. First cover spray 



3. Second cover spray 



1. Calyx spray 



2. First cover spray 



3. Second cover spray 



4. Third cover spray 



1. Calyx spray 



2. First cover spray.. 



3. Second cover spray 



4. Third cover spray 



5. Fourth cover spray 



Time of application 



Schedule 1 (1 spray). 

 Schedule 2 (2 sprays) 



Schedule 3 (3 sprays) 

 Schedule 4 (4 sprays) 



Schedule 5 (5 sprays) 



Just before worms begin to hatch. 



When most petals have fallen. 

 3 or 4 weeks after 1. 



When most petals have fallen. 

 2 to 3 weeks after 1. 

 2 weeks after 2. 



When most petals have fallen. 

 2 to 3 weeks after 1. 

 2 weeks after 2. 

 7 or 8 weeks after 2. 



When most petals have fallen. 

 2 to 3 weeks after 1. 

 2 weeks after 2. 

 7 or 8 weeks after 2. 

 2 or 3 weeks after 4. 



