- 3 



C. Apply foliar sprays of calcium chloride CCaClo) starting 

 about 3 weeks after petal fall and repeat at z-week inter- 

 vals, totalling 6 to 8 applications. Apply 6 to 8 pounds 

 CaCl2/acre/spray until mid-July. After mid-July, apply 

 12 to 18 pounds /acre/spray. Sprays may be applied dilute 

 or on a trial basis up to 6X concentration. Preliminary 

 observations indicate that CaCl2 can be added to the cover 

 sprays of pesticides. However, growers desiring to com- 

 bine CaCl2 with their cover sprays should do it on a trial 

 basis only . When combining with cover sprays, add CaCl2 

 last to the spray tank. If weather conditions permit go- 

 ing over 14 days without a cover spray, use CaCl2 spray 

 alone. If foliar injury from CaClo occurs, don't apply 

 again until after substantial rainfall (an inch or more). 

 Do not mix CaCl2 and Solubor* in sprays. 



Magnesium (Mg) : The requirements of trees for this element can 

 best be met by maintaining an adequate dolomitic liming program. 

 Since it takes years before lime is effective in correcting Mg 

 deficiency, Epsom salt sprays can be used to help correct the con- 

 dition. Apply 2 to 3 sprays at the rate of 15 to 20 lbs per 100 

 gallons of water at the time of calyx, first cover and second cover 

 sprays. To avoid possible incompatibilities, the Epsom salt sprays 

 should not be combined with the regular pesticide sprays. Don' t 

 apply Epsom salts or a lime high in Mg unless leaf analysis or vis - 

 ual observation indicate low Mg levels . Mg can suppress Cal 



Boron (B) : This element can be supplied to apple trees either by 

 foliar or soil applications. Use the most economical and conven- 

 ient method. However, it is safest to apply all elements as a fer - 

 tilizer except m emergency situations . 



Soil applications of boron (B) should be applied to orchards 

 every 3 years. The rates of application per tree vary with age and 

 size. In low density orchards, apply 1/4 pound of borax (11.1^ 

 actual B) or its equivalent under young trees coming into bearing, 

 1/2 to 3/4 pound to medium age and size trees and -3/4 to 1 pound 

 to large or mature trees. Be sure to note the percent actual B in 

 the fertilizer being used to supply this element . B containing fer- 

 tilizers vary from approximately 11 to 2T1 actual B. 



In medium and high density orchards (US trees/acre or higher] ^ 

 it might be best to apply B on an acre basis. We suggest the fol- 

 lowing rates per acre of borax (11.11 actual B) or its equivalent: 

 (a) trees 4 to 7 years of age - 12 lbs; (b) trees 8 to 15 years of 

 age - 12 to 24 lbs; and (c) trees 16 to 30 years of age - 24 to 4R 

 lbs. 



When the soil application of B is followed by a wet spring, it 

 may be advisable to apply 2 foliar applications of B the following 

 year. 



*Trade name 



