
TY  - JOUR
A1  - Jacyna, T. 
A1  - Jacyna, T. 
A1  - Barnard, J. 
A1  - Barnard, J. 
A1  - Cummins, J. N. 
A1  - Cummins, J. N. 
T1  - Chemical suppression of spininess in Geneva 30 apple rootstocks and its residual effects on nursery tree characteristics
JF  - Australian Journal of Experimental Agriculture
JO  - Aust. J. Exp. Agric.
Y1  - 2000
VL  - 40
IS  - 3
SP  - 451
EP  - 456
KW  - butralin, naphthaleneacetic acid.
UR  - https://doi.org/10.1071/EA98144 
N2  - A proprietary mixture of butralin + fatty alcohols or naphthaleneacetic acid were applied to reduce or prevent spininess in Geneva 30 apple rootstock. Rootstock liners were foliar treated with butralin + fatty alcohols or naphthaleneacetic acid, or hand-cleared. Spine regrowth responses to both compounds, expressed as spine cumulative length, were rate dependent and decreased as the concentration of the compound increased (P&#60;0.003). Before budding, all rates of butralin + fatty alcohols or naphthaleneacetic acid (except naphthaleneacetic acid at 25 mg/L ), or hand-cleared reduced the number of spines and their cumulative length compared with controls. The rootstocks were budded to apple cv. &#8216;Jonagold&#8217;. None of the treatments caused significant spininess recurrence, or stimulated root suckering. All treatments reduced rootstock stem cross-sectional area, except butralin + fatty alcohols at 250 and 750 mg/L in comparison with control rootstock stem cross-sectional area. Budded rootstocks were transplanted into the nursery and grown for an additional year without chemical treatment. No adverse effects of previous treatments on tree characteristics were found, except a significant reduction in tree height caused by naphthaleneacetic acid at 200 mg/L. No differences in quality characteristics between trees grown on chemically or manually deshooted Geneva 30 rootstocks were found. 
ER  -

