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United States Department of Agriculture

Agricultural Research Service

Research Project: BIOLOGY AND MANAGEMENT OF SOILBORNE DISEASES OF HORTICULTURAL CROPS

Location: Horticultural Crops Research

2007 Annual Report


1a.Objectives (from AD-416)
Evaluate the etiology and epidemiology of soilborne diseases of small fruit and nursery crops and the biology of causal pathogens. Develop, evaluate, and enhance strategies for the management of soilborne diseases of horticultural crops. Develop knowledge of mechanisms contributing to biological control of soilborne plant diseases.


1b.Approach (from AD-416)
Dose-response relationships between propagule density in irrigation water and disease. Identification of factors influencing pathogen dispersal and disease spread among containers in a nursery. A systematic survey of blueberry fields throughout the PNW will be conducted to identify nematode pathogens. Greenhouse and microplot experiments will be employed to determine the effects of a range of population densities of nematode species found in the survey on the health of a widely planted blueberry cultivar. Test the Electrocatalytic Oxidation/precipitation (EO) method. Identify factors influencing the efficacy of the EO method. Test the EO method in an experimental nursery setting. Use the recently-described genomisotopic approach to purify the two cryptic metabolites from cultures of Pf-5. Derive mutants of Pf-5. Assess the role of novel metabolites in biological control. Test toxicity of the purified metabolites. Evaluate gene expression by Pf-5 on seed surfaces using RNA isolation, labeling and hybridization. Characterize the nutritional composition of seed exudates. Generate derivatives of Pf-5 with mutations in selected genes. Test mutants for spermosphere colonization and biological control of Pythium damping off. Replaced 5358-12220-001-00D (3/03). FY03 $73,538 Program Increase. FY06 $133,650 Program Increase (memo #44). Replacing 5358-12220-002-00D (3/07).


4.Accomplishments
The described experiments are being carried out as outlined in the project plan. This CRIS is new as of 5/2007, accomplishments for the previous project can be found in 5358-12220-002-00D, which occupied the majority of the reporting period.


5.Significant Activities that Support Special Target Populations
None


6.Technology Transfer

Number of web sites managed1
Number of non-peer reviewed presentations and proceedings3

Last Modified: 9/23/2014
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