13 - 



Zinc (Zn) : Based on optimum levels of Zn established by some 

 states, some of our orchards are low in this element. Massachu- 

 setts growers have not used zinc sulfate sprays applied at the 

 '•green tip" stage of bud development to increase zinc levels but 

 some use manganese-zinc containing fungicides. These appear to 

 be increasing Zn levels in our orchards. 



NAPHTHALENEACETIC ACID (NAA) FOR TREE TRAINING 



William J. Lord and Joseph Sincuk 

 Department of Plant and Soil Sciences 



It was reported in 

 excellent tree training 

 the stem of newly-plant 

 second, third, and four 

 cut, which was not pain 

 treatment eliminated th 

 the trees which compete 

 number of favorably pos 

 and improved crotch ang 

 the bud selected for th 

 reportedly developed fr 

 suggested NAA treatment 

 procedures which involv 

 is in competition with 



1977 that II NAA in latex paint is an 



aid when applied as a painted band around 

 ed apple trees (after heading) to cover the 

 th buds. The first bud below the heading 

 ted, became a vigorous central leader. This 

 e cluster of vigorous shoots in the top of 



with the central leader and increase the 

 itioned branches on the newly-planted trees, 

 les of these branches. If for some reason 

 e central leader died, a strong leader 

 om the NAA-treated area. Basically, the 



is a replacement for the current training 

 e removal by hand, in June, of growth that 

 the shoot favored as a central leader. 



Directions for use indicated that the II NAA in latex paint 

 should be applied after heading the newly-planted tree to the 



