- in 



tank. If weather conditions permit going over 14 days without 

 a cover spray, use CaCl2 spray alone. CAUTION : DURING DROUGHT 

 DO NOT APPLY A SECOND FOLIAR CaCl2 APPLICATION UNTIL AN INCH 

 OR MORE OR RAIN FALLS. Do not mix CaCl2 and Solubor* in sprays, 



Foliar injury usually is worse on Mcintosh than Delicious. 

 There is some evidence that the combination o£ guthion and 

 CaCl2 may increase foliar burn. Foliar injury was more severe 

 from dilute sprays than when applied at 6X at the Horticultural 

 Research Center in 1976 but the opposite occurred in 1977. This 

 appears to indicate the CaCl2 injury varies with season because 

 of such factors as rainfall and temperature. 



Magnesium (Mg) : Deficiency symptoms of Mg (Figure 2) are not 

 as prevalent as in the past but this important element should not 

 be forgotten in our anxiety to increase Ca levels. 



Pictu 



f icie 



the s 



Defic 



ized 



tween 



leave 



usual 



seaso 



toms 



By la 



which 



may b 



leave 



defic 



at ha 



red on the 

 ncy symptom 

 ymptoms on 

 iency sympt 

 by necrotic 



the veins, 

 s on shoots 

 ly affected 

 n progresse 

 appear on t 

 te summer, 



the leaves 

 e defoliate 

 s near thei 

 iency incre 

 rvest . 



left is Mg 

 s on pear 

 apple are 

 oms are ch 



(brown) a 

 The olde 



and spurs 



first, an 

 s the inju 

 he younger 

 the shoots 



show Mg d 

 d except f 

 r terminal 

 ases fruit 



de- 

 leaves ; 

 similar, 

 aracter- 

 reas be- 

 r, basal 



are 

 d as the 

 ry symp- 



leaves. 



on 

 ef iciency 

 or a few 

 s. Mg 



drop 



gram. 



Mg def 



condit 



gallon 



sprays 



should 



apply 



The requirements of trees for 

 Mg can best be met by maintaining 

 an adequate dolomitic liming pro- 

 Since it takes years before lime is effective in correcting 

 iciency, Epsom salt sprays can be used to help correct the 

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

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

 To avoid possible incompatibilities, the Epsom salt sprays 

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



Epsom salts or a lime high in Mg unless leaf analysis or visual 



observation indicates low Mg levels. Mg can supress Ca ; 



Boron (B) : Toxicity symptoms of this element were observed in 

 a few orchards in 1977. They occurred on bearing trees sprayed 

 with a foliar application of B and on trees fertilized with B the 

 year of planting. The picture on the following page shows typical 

 foliar symptoms of B toxicity. The symptoms are characterized 

 by loss of chlorophyll (green coloration) from along the midrib 

 and larger lateral veins. The symptoms are first apparent at the 



*Trade Name 



