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Apple and pear rootstocks

CG 202 (USA) apple rootstock

  • Origin: Cornell University and USDA (Malling 27 x Robusta 5).
  • Tree size slightly larger than M26.
  • Resistant to fire blight, good resistance to woolly aphid.
  • Moderate stool bed performance, produces good quality nursery trees.
  • Produces very few burrknots or suckers.
  • Precocity and productivity similar to M26 (in NZ shows higher productivity than M26).
  • Best suited for tree densities of 1500-2500 trees/ha.

NIC® 29 (Belgium) M9 size apple rootstock

  • Tree size equivalent to strong M9 clone.
  • Trees grown on Nic® 29 approach M26 in size with M9 precocity and productivity.
  • Most productive M9 clone in layer beds.
  • Roots are less brittle than most other M9 clones when harvesting layer beds, transplanting in the nursery and with finished trees.
  • Most widely planted M9 clone in the USA.
  • All other characteristics like EM9.

BM 2000 (Australia) pear rootstock

  • An Australian bred pear rootstock showing excellent early yields of high quality fruit in APFIP national trials.
  • Precocity and productivity similar to BP1.
  • Semi-dwarfing rootstock (75% of D6/Calleryana).
  • Suitable for high density plantings.

Bp1 (South Africa) pear rootstock

  • Semi-dwarfing rootstock (75% of D6/Calleryana).
  • Shows excellent results in national APFIP trials with both Williams and Packhams pears.
  • Precocious and productive pear rootstock.
  • Produces calm trees for easier management.
  • Suitable for high density plantings.

  Quince ‘EMH’ (UK) pear rootstock

  • A UK bred pear rootstock showing excellent early yields of high quality fruit in UK trials.
  • Similar or slightly more vigour than Quince “C” showing intermediate vigour between “A” and “C”.
  • Shown to increase fruit size in UK trials. Yield efficiency was similar to Quince “C”.
  • 50% tree size of trees grown on D6.

 

Krymsk™ cherry rootstocks

GENERAL COMMENTS:

Based on overseas observations.
The Krymsk™ Cherry rootstocks are similar in vigour to other semi-dwarfing cherry rootstocks.

Key advantages are:

  • More stress tolerant than other semi-dwarfing rootstocks (heat/low humidity, difficult soils and poor growing conditions). More disease tolerant eg Pseudomonas and crown gall.
  • Krymsk™ rootstocks perform well in Bakersfield, California which is a difficult cherry growing area.
  • Fruit size is the same as on semi-dwarfing and Mazzard rootstocks.
  • Currently selling 250,000 trees each per year of Krymsk™ 5 and 6 in the USA. Some of the largest WA, USA growers are now only planting Krymsk™ cherry rootstocks and nothing else.
  • Minor disadvantages include:
  • Krymsk™ 5 and 6 are virus sensitive so virus-free budwood is required. (Krymsk™ 7 is not virus sensitive).
  • The Krymsk™ rootstocks have moderate suckering which should not be a problem for growers.

Krymsk 5 (VSL-2 cv. A) 90% size of F12/1

Prunus fruticosa x P. lannesiana

Compatible with sweet and sour cherries. Smooth graft union. Good adaptation to cold climates. Very precocious with high yields. Excellent tree form with wide crotch angles. No crown gall observed. Resistant to wet soils. Good fruit size and firmness. Sensitive to Prunus ringspot and Prunus dwarf virus.

KRYMSK 6 (LC-52 cv.A) 75% size of F12/1

Prunus cerasus (Lyubskaya) x Cerapadus Michyunin (P. cerasus x P. maackii)

Compatible with sweet and sour cherries. Smooth graft union. Good adaptation to cold climates. Very precocious with high yields. Excellent tree form with wide crotch angles. No crown gall observed. Tolerant of water stress. Resistant to wet soils. Good fruit size and firmness. Sensitive to Prunus ringspot and Prunus dwarf virus.

KRYMSK 7 (L-2 cv.A) 100% size of F12/1

Prunus lannesiana

Compatible with sweet and sour cherries. Smooth graft union. Good adaptation to cold climates. Very precocious with high yields. Excellent tree form with wide crotch angles. No crown gall observed. Resistant to wet soils. Good fruit size and firmness. Tolerant of dry soil conditions. Not sensitive to Prunus ringspot or Prunus Dwarf Virus.