APPLE ROOTSTOCKS
Pi-80 Select

SIZE CLASS 4-5

Pi-80 Select (Pillnitzer 80, PiR 80, Pi 80, Supporter 4)



Pedigree

M.9 X M.4

 

Precocity

Similar to M.26

Productivity

Competitive with M.26, more yield efficient that M.26 in some German trials.

Scion Fruit Size

 
Scion Fruit Quality  

Anchorage

Support usually recommended for young orchards, reported to be better anchored than M.26

Fire blight

Extremely susceptible

Crown & Root Rots

Untested

Woolly Apple Aphid

 

Powdery Mildew

Susceptible

Hardiness (Midwinter)

Moderate to excellent hardiness, further testing required
Bud Break  
Leaf Fall  

Suckering

Light

Burrknots

Light

Stoolbed Performance

Excellent, perhaps the best

Virus hypersensitivities

None noted, further testing required

Experience

Pi-80 Select has been planted in North America very recently in a few small trial plots.

Sources

Meadow Lake

Strains

Pi-80 select is reportedly a better rooted strain of the original Pi-80. The original Pi-80 is not present in North America.

Observations, suspicions, history

Pi-80 Select may become a strong competitor with M.26. Reports vary, but Pi-80 Select is usually reported to impart slightly more vigor on the scion than M.26. Orchard trials have shown Pi-80 Select to be as productive as M.26 or better, but it is easier to propagate in the stoolbed. Extensive testing and now planting in Europe has generated strong interest in this rootstock. Pi-80 Select is extremely hypersensitive to fire blight, similar to M.26.

 

 

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Last modified September 21, 1999.