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United States Department of Agriculture

Agricultural Research Service


Location: Fruit and Nut Research

2013 Annual Report

1a. Objectives (from AD-416):
To develop new stonefruit rootstocks and management practices to control soilborne diseases and nematodes.

1b. Approach (from AD-416):
Soilborne diseases and nematodes will be investigated by: 1) evaluating stonefruit germplasm on sites infested with soilborne diseases and nematodes; 2) intercrossing and developing selections for further breeding, commercial testing and subsequent release; and 3) testing and evaluating new and novel combinations of chemical and cultural strategies in conjunction with genetic solutions.

3. Progress Report:
This research is related to inhouse objective 1. Develop improved scion varieties of peaches for both the early season and main season production areas of the southeastern United States with traits leading to increased consumer acceptance, novel flesh types with superior post-harvest handling characteristics, and labor-saving tree architecture. The development of new rootstocks and management practices for the control of soilborne diseases and nematodes of peach is an urgent need of the southeastern U.S. peach industry. This has become even more apparent since the introduction of Guardian peach rootstock in 1993. Guardian has been widely adopted by the southeastern U.S. peach industry and although it has provided exceptional resistance to peach tree short life (PTSL), it is highly susceptible to Armillaria root rot (ARR) which has now overtaken PTSL as the primary cause of premature peach tree death. MP-29, a plum x peach hybrid rootstock selections bred in this program, was released in 2011 and has been scaled up for commercial production by licensed nurseries. MP-29 offers superior resistance to both PTSL and ARR. Several more rootstocks are nearing release. Evaluations are continuing and the scaling up of materials to support expected release(s) is progressing.

4. Accomplishments

Last Modified: 06/24/2017
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