APPLE ROOTSTOCKS
GENEVA 30
SIZE CLASS 6
GENEVA 30
Pedigree
1974 cross of Robusta 5 crabapple and M.9 by Dr. Jim Cummins, Cornell University
Precocity
Very good, much better than M.7
Productivity
Excellent, far superior to M.7
Fruit Size
Anchorage
Well anchored, much better than M.7, but see notes about weak graft unions below
Fire blight Resistance
Resistant
Crown Rot Tolerance
Somewhat tolerant, currently testing
Woolly Apple Aphid Susceptibility
Moderate
Powdery Mildew Resistance
None
Bud Break
High Soil Temperature Sensitivity
Hardiness (Midwinter Chilling)
Suckering
Light
Burrknots
Rare
Stoolbed Performance
Poor
Virus sensitivities
Susceptible to Apple Mosaic Virus
Experience
Limited, sold commercially since 1998. Exceptional performer in NC-140 trials, consistently has very high yield efficiency.
Observations, suspicions, history
Strongly branched liner growth habit in stoolbeds and nurseries requires laborious trimming. Shown to have particularly weak graft unions with the cultivar "Gala." G.30 would best be planted with a trellis, and a strong 3-wire trellis is a requirement for plantings with brittle wooded cultivars such as Gala.
Sources
Cummins, Willow Drive, Copenhaven, Williamette, Treco, Meadow lake
Return to Breeders' Page
Apple Rootstocks Page
Last modified May 20, 1999.
http://www.nysaes.cornell.edu/hort/breeders/geneva30.html