Location: Fruit and Nut Research2007 Annual Report
1a. Objectives (from AD-416)
Develop improved nematode management strategies based on cultural and biocontrol approaches for suppression of ring and (or) root-knot nematode and related peach disease complexes and elucidate the interactive effects and (or) incidence among key nematode pests, pathogenic fungi, and rootstocks to improve the understanding of host susceptibility associated with peach and pecan tree decline problems, such as Peach Tree Decline and Pecan Replant Disease.
1b. Approach (from AD-416)
Evaluate selected rotation crop for suppression of root-knot nematode as an alternative to fumigation; investigate natural products associated with rotation crop for effect on nematode egg hatch and vermiform-life stage survival; investigate solarization alone and in combination with the application of a cocktail of biocontrol agents for nematode management when delivered through irrigation; characterize the suppressive effects of biocontrol agent towards the Pecan and Peach root-knot nematodes; develop new knowledge regarding interactive effects among nematode pests and (or) pathogenic fungi as associated with peach and (or) pecan replant disease; and evaluate advanced Prunus germplasm for resistance to continuous root-knot nematode pressure under field conditions. Resources will support research already taking place on this project. This includes development of strategies or approaches to minimize the economic impact of nematodes and other pathogens on peach and pecan. Work involves ground covers, alternatives to chemical nematicides, and biological agents to reduce nematode populations in soils.
3. Progress Report
Accomplishments: Groundcover Suppresses Root-Knot Populations: Research on tall fescue susceptibility to M. incognita (GA-peach isolate) was investigated under greenhouse conditions. Finding an alternative groundcover rotation to preplant chemical control of root-knot nematode is warranted. Short-term (196 days; 10 reps; repeated one time) data indicate that M. incognita did not reproduce nor produce root galls on tall fescue as compared to Lovell peach (i.e., root-knot nematode susceptible host). These data provide useful insights into the potential use of tall fescue rotation as an alternative to preplant chemical control of root-knot nematode prior to peach tree establishment in the Southeast. These data also provided the basis to further evaluate this ground cover under field conditions (see Milestone #1 above. NP-303 Action Plan Component: #4: Biological and Cultural Strategies for Sustainable Disease Management. NP-303 Action Plan Problem Statement #4A: Biological and Cultural Control Technologies.
5. Significant Activities that Support Special Target Populations