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Deep
Purple Plum as a Rootstock for Nonpareil John Edstrom Stan Cutter The USDA Agricultural Research Service has identified a plum type rootstock, Deep Purple (DP) (Prunus besseyi x p. salicina) which has shown potential as a compatible rootstock for Nonpareil. DP has shown resistance to root knot and root lesion nematodes in USDA Field trials in Fresno. The tolerance of this rootstock to Oak Root Fungus is unknown. The objective of this trial is to evaluate the compatibility and field performance of Nonpareil on DP rootstock as compared to Mission on Marianna 2624 plum (M2624). As a second objective, newly developed almond varieties will also be evaluated for their compatibility on M2624 as they become available. All trees were planted as rootstocks out of cold storage on April 22, 1998,
and budded to scion varieties in May. The following combinations were
established in 4 replicates of 3 trees each:
Results: The condition of much of the DP material out of cold storage was poor compared to the M2624 material. Trees on DP were small and many showed broken or cracked roots. Trees of Nonpareil on DP in particular started out at a disadvantage in this test. Growth this first season was poor. During the second year (1999) overall tree growth improved, however major
tree losses occurred on Nonpareil/DP. September 1999 ratings showed the
following survival rates:
This initial effort at field evaluation of Deep Purple as a rootstock for Nonpareil has been discouraging. The poor condition of the plant material provided out of cold storage, and the rather late planting date were certainly detrimental to this planting. Additional efforts are needed to fairly evaluate this rootstock. Plant material of new almond varieties on Marianna 2624 plum is not yet available for field evaluation. |
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