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UC Pest Management Guidelines


Avocado

Rootstock Tolerance to Disorders and Pathogens

(Reviewed 1/07, updated 1/07)

In this Guideline:


Use rootstocks that areresistant to, or tolerant of, key disorders and diseases, such as avocado root rot (Phytophthora cinnamomi). Because rootstock cultivars resistant to one problem may be more susceptible to another, consider planting a mixture of the recommended rootstock cultivars.

Rootstock Origin Pathogens1 Stressors1
Cultivar2 Propagation Phytophthora cinnamomi Phytophthora citricola Dothiorella Salinity Frost
Barr Duke
Mex
clonal
3.5
3
5
2
4.5
Borchard
Mex
clonal
0.5
3
5
3
4.5
Duke 7
Mex
clonal
3
4
5
3
4
Duke 9
Mex
clonal
3.5
4
5
3
4.5
Dusa (Merensky 2)
Mex X G
clonal
5
5
4
4.5
G-6
Mex
seed
2
3
2
2
4.5
Lula
G X WI
seed
1
Latas (Merensky 1)
Mex X G
clonal
4.5
5
5
4.5
Martin Grande
X3
clonal
5
3
2
1
Thomas
Mex
clonal
4.5
2
2
1
4.5
Topa Topa
Mex
seed
0
3
5
2
4.5
Toro Canyon
Mex
clonal
2.5
5
5
3
4.5
Uzi (PP15)
Mex
clonal
5
4
3
4
Zentmyer (PP4)
Mex
clonal
5
3
4
1
5
1 Ratings for pathogen/stressor are from 0 to 5, with 0 being poor or least tolerant and 5 being the best or most tolerant. Ratings are approximate and based on observations and studies under a variety of field and greenhouse conditions. Ratings of newer rootstocks are preliminary; check with your advisor or supplier for the latest information on rootstock tolerances.
2 Cultivar or horticultural race is Mex = Mexican, G = Guatemalan, WI = West Indian, X = a hybrid of cultivars or species.
3 Martin Grande (also identified as G755A,B,C) is a hybrid of Persea americana X P. schiedeana.
= unknown

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Avocado
UC ANR Publication 3436
General Information
Adapted from: Bender, G., J. Menge, and M. L. Arpaia. 2003. Avocado Rootstocks. University of California Cooperative Extension. Topics in Subtropics 1(3): 7–8.

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