DETERMINING TIME OF APPLICATION 303 



Second Apple-Maggot Spray, or Third Codling-Moth Cover Spray 

 (about July 15). 



To prevent excessive spray residues, the use of calcium arsenate or 

 basic zinc arsenate is suggested at this time on all varieties as follows: 



Wettable sulfur (at manufacturer's directions) 



Calcium arsenate * 2 pounds 



Hydrated lime 6 pounds 



Water to make 100 gallons 



The same suggestions relative to spreader as those mentioned in first 

 codling-moth cover spray are followed. If dust is used, a 90-10 sulfur- 

 lead-arsenate mixture is indicated. 



Washing Schedule 

 {where fruit may he washed if necessary) 



The following formula may be used in all three of the cover sprays 

 outlined in the non-washing schedule. 



Wettable sulfur (at manufacturer's directions) 



or 



Lime-sulfur (if scab is a problem) 2 gallons 



Lead arsenate 3 pounds 



Water to make 100 gallons 



For a spreader, ^2 pound of lignin-pitch may be used with lime- 

 sulfur or in home-made wettable sulfur for the first cover spray, and 

 % pound of skim milk powder or 1 pound of soybean flour in the second 

 and third cover sprays. One pound of lime is used with each pound of 

 lead arsenate, or 2 pounds of lime with each pound of lead arsenate if 

 arsenical injury is a problem. 



If dust is used, a 90-10 sulfur-lead-arsenate mixture is indicated. 

 The same precautions concerning residue should be taken in dusting 

 as in spraying. During prolonged rain periods, it is advisable to make 

 dust applications at shorter intervals than are indicated for spray mix- 

 tures. When there is already some scab on the foliage, control is made 

 more effective by retying on applications of liquid lime-sulfur spray, 

 since thorough applications of the material will burn out the scab 

 lesions and will prevent in large measure the formation and spread 



* Basic zinc arsenate, 2 pounds may be substituted for calckim 

 arsenate. One pound of lime is used with each pound of zinc arsenate. 



