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 











do 



Do. 





2. Cover spray.. . - - . . 













2. First-brood cover spray_. - - -- 











Schedule 4 (4 sprays).. . 



1. Calyx spray . ... . .-- - 



When most petals have fallen. 







2 to 3 weeks after 1. 





3. Second cover spray 



2 weeks after 2. 





1. Calyx spray 



When most petals have fallen. 





2 to 3 weeks after 1. 







8 to 10 davs after 2. 





4. Third cover spray 



16 to 20 days after 2. 



















8 to 10 davs after 2. 







16 to 20 davs after 2. 





5. Fourth cover spray 



6. Fifth cover spray . 



6 to 7 weeks after 2. 

 10 to 11 weeks after 2. 



Schedule 7 (7 sprays) .. - ..- 





When most petals have fallen. 







2 to 3 weeks after 1. 





3. Second cover spray 



4. Third cover spray.. . .. 



8 to 10 days after 2. 

 16 to 20 davs after 2. 







24 to 30 davs after 2. 





6. Fifth cover spray- 



6 to 7 weeks after 2. 







10 or 11 weeks after 2. 









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



Schedule 



Spray 



Time of application 



Schedule 1 (1 spray) .. 

 Schedule 2 (2 sprays) - 



Schedule 3 (3 sprays) . 

 Schedule 4 (4 sprays) . 



Schedule 5 (5 sprays) . 



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. 



Just before worms be?in 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. 



