ORCHARD INSECTS OF THE PACIFIC NORTHWEST 



75 



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 and pears in the Pacific 



Northwest 



Schedule 



Spray 



Time of application 



On apples 



On pears 





1. Calyx spray, .. ... _ .. 



When most petals have fallen, 

 do 



Just before worms begin to 

 hatch (combined calyx and 

 cover spray) . 



When most petals have fallen. 





r _.do 



Schedule 2.. 





4 weeks after 1 



When most petals have fallen 

 4 weeks after 1 . . 



Schedule 3 



[1. Calyx spray 



<2. First-brood cover spray,,. 

 1.3. Second-brood cover spray. 



fl. Calyx spray 



When most petals have fallen. 





6 or 7 weeks after 2 







When most petals have fallen 



When most petals have fallen. 







Schedule 4. . 



|3. Second cover spray 



14. Third cover spray 



|1. Calyx spray 



2. First cover spray.. . 



2 weeks after 2 



6 or 7 weeks after 2 



2 weeks after 2. 

 7 or 8 weeks after 2. 





When most petals have fallen _ 

 8 to 21 days after 1 



8 to 10 days after 2... 



When most petals have fallen. 

 2 to 3 weeks after 1. 





•J3. Second cover spray 



4. Third cover spray 



[5. Fourth cover spray 



1. Calyx spray 



2. First cover spray _. 



2 weeks after 2. 





16 to 20 days after 2 



7 or 8 weeks after 2. 





6 to 7 weeks after 2 



When most petals have fallen 

 8 to 21 days after 1 



8 to 10 days after 2 



2 or 3 weeks after 4. 





3. Second cover spray 



4. Third cover spray 



5. Fourth cover spray 



6. Fifth cover spray . 





Schedule 6_. 



16 to 20 days after 2 







6 to 7 weeks after 2 . . 







10 to 11 weeks after 2. . 









When most petals have fallen. 

 8 to 21 days after 1 







2. First cover spray.. 







3. Second cover spray 



< 4. Third cover spray 



5. Fourth cover spray 



6. Fifth cover spray. . 



8 to 10 days after 2 







16 to 20 days after 2 







24 to 30 days after 2, 







6 to 7 weeks after 2. 







,7. Sixth cover spray 



10 or 11 weeks after 2. . _ 











DUSTING MATERIALS 



Dust mixtures have not been so satisfactory as liquid sprays, on 

 the whole, although in some instances they have been used success- 

 fully. A mixture containing 10 percent of lead arsenate, 75 percent 

 of sulfur, and 15 percent of filler, such as gypsum or hydrated lime, 

 finds some use as a combination insecticide and fungicide. Nicotine 

 dusts, composed of hydrated lime impregnated with nicotine, are 

 much used on truck crops and may also be used on fruit trees. Dusting 

 must be done in calm weather if it is to be successful. 



TREE-BANDING MATERIALS 



Bands of burlap or corrugated paper may be used to trap larvae 

 of the codling moth. If the paper bands are impregnated with a 

 mixture of beta-naphthol and oil, as mentioned on page 5, it will not 



