3 - 



Mid-terminal leaves collected in early August commonly show 

 about 35 ppm of boron. Leaf-content of boron is not considered a 

 reliable guide to the need for boron applications. A tree could 

 show ample boron during a period of adequate soil moisture, yet 

 later develop boron deficiency in the fruits if a drouth ensued. 

 However, early-August sprays containing Solubor greatly increase 

 the boron content of flesh of fruits harvested in mi d-feptember ; 

 thus rapid translocation of boron to the fruit must occur. 



Mixed fertilizers containing boron at commonly employed rates 

 have failed to prevent boron deficiency in our fruits. Possibly 

 after enough years of use, results would have been different. How- 

 ever, soil moisture content is well known to influence availabil- 

 ity to the plant of soi 1 -contai ned boron. 



bran 

 of a 

 orch 

 plan 

 spre 



1 n s 

 Vail 



sti p 

 brow 

 It i 

 not 



Whe 

 ches 

 pple 

 ard 

 e ap 

 ad s 



Sti 

 pi te 



ey. 

 pen . 

 ning 

 s ea 

 rese 



n ap 

 has 

 lea 

 area 

 pi i c 

 eeme 



ppen 



of 



Our 

 In 



of 

 sily 

 mbl e 



p 1 y i n 

 give 



ves a 

 some 



a t i n 



d to 



2 

 occ 



the b 

 test 

 some 



f rui t 

 el im 

 stip 



g boron to the ground, ring 

 n the most consistent incre 

 nd fruits. Broadcast appli 

 times have been only parti a 

 on a fairly narrow band no 

 be satisfactory in a few te 



urs abundantly on trees of 

 orbn treatments routinely a 

 s have not shown a relation 

 varieties, such as Baldwin 

 flesh around the apple cor 

 inated by the use of boron, 

 pen. (See Cornell Extensio 



application under the 

 ases in boron content 

 cations over the whole 

 lly effective. Air- 

 greater than branch 

 sts on bearing trees. 



susceptible varieties 

 pplied in the Champlain 

 ship between boron and 

 , we get a diffused 

 e from boron deficiency 



This symptom does 

 n Bulletin 426, 1940) 



It seems doubtful that the "cork spot" of the variety York is 

 related to boron deficiency of Mcintosh and other varieties in 

 New York. 



'Also called bitter pit and Baldwin spot 



*************** 



