Rootstocks

Rootstocks and Nursery Tree Quality

Finding more precocious and productive rootstocks adapted to South African conditions is integral to our Orchard of the Future vision. For this reason, various pome and stone fruit rootstocks are evaluated in an increasing number of industry trials in commercial orchards.

Hortgro Science has appointed Provar to run new rootstock trials under the supervision of Dr Xolani Siboza and with input from Dr Piet Stassen and the Rootstock Evaluation Committee. Together with the new funding strategy of rootstock evaluation, which involves co-funding by IP owners and licensees, this increases the number of trials that can be handled. More trials mean better data and hopefully earlier and more confident recommendations regarding new rootstocks.

Dr Piet Stassen’s comprehensive stone fruit rootstocks trials have been summarised in the Fresh Quarterly of Sept 2019. Prof Stephanie Midgley’s research on water deficit tolerance of apple rootstocks suggests that M9 is not necessarily more susceptible to water stress. Other rootstock research is aimed at characterising new rootstocks in terms of adaptation and disease and pest tolerance.

EXPERTISE:
ROOTSTOCK AND NURSERY TREE QUALITY WORKGROUP
ROOTSTOCK EVALUATION COMMITTEE

 

Projects list

  • Performance of apple trees derived from tissue culture compared to those from layer beds. (A. Kleinert)
  • Apple rootstock influence on Granny Smith scion growth, productivity and fruit green colour. (X. Siboza)
  • Rootstock effect on growth synchronisation of Golden Joy apples planted in low chill areas. (X. Siboza)
  • Drought tolerance of various plum rootstocks. (S. Midgley)
  • Testing stone fruit rootstocks for salt tolerance in controlled conditions and in situ (W. Truter)
  • Evaluation of new plum rootstocks for South African fruit industry. (C. Horstmann)
  • Growth synchronisation of stone fruit rootstocks and scions with different chilling requirements. (C. Horstmann)
  • Evaluation of new peach rootstocks for South African fruit industry. (C. Horstmann)
  • Evaluation of pear rootstocks for the South African industry. Packham’s Triumph in Grabouw. (X Siboza and I Labuschagne) [Abstract]
  • Evaluation of pear rootstocks for the South African industry. Forelle in Wolseley (Mostertshoek) (X Siboza and I Labuschagne) [Abstract]
  • Evaluation of pear rootstocks for the South African industry. Cheeky in Wolseley (Mostertshoek). (X Siboza and I Labuschagne) [Abstract]
  • Evaluation of peach and nectarine rootstocks for the South African fruit industry in association with IP owners at Vaalwater. (P Stassen and I Labuschagne) [Abstract]
  • Evaluation of peach rootstocks for the South African fruit industry: Rawsonville planting (Slanghoek). (P Stassen and I Labuschagne) [Abstract]
  • Evaluation of plum rootstocks for the South African fruit industry in association with IP owners at Simondium, (Keunenberg). (P Stassen and I Labuschagne) [Abstract]
  • Evaluation of plum rootstocks for the South African fruit Industry: Robertson planting (Roodehoogte). (P Stassen and I Labuschagne) [Abstract]
  • Evaluation of new apple rootstocks and interstem combinations in Grabouw (Oak Valley). (X Siboza and I Labuschagne) [Abstract]
  • Evaluation of new apple rootstocks and interstem combinations in Grabouw (Breëvlei). (X Siboza and I Labuschagne) [Abstract]
  • Evaluation of new apple rootstocks and interstem combinations in the Langkloof (Helderwater). (X Siboza and I Labuschagne) [Abstract]
  • Evaluation of new apple rootstocks representing two vigour classes in two growing areas (Bokveldskloof and Molteno). (X Siboza and I Labuschagne) [Abstract]
  • Evaluation of new apple rootstocks representing three vigour classes at Môrester and Oak Valley. (X Siboza and I Labuschagne) [Abstract]
  • Sensitivity of various apple rootstocks to water stress. (S Midgley and L Muchena) [Abstract]
  • Establishing quantitative relationships between water relations, growth, yield and quality of high performing commercial apple orchards. (S Midgley and S Zirebwa) – see Irrigation and Nutrition [Abstract]
  • Evaluation of apple rootstocks tolerance against specific apple replant disease (SARD). (I Labuschagne, X Siboza and A McLeod)
Evaluate methods to produce and handle containerised nursery trees. (K Theron and W Truter)