Disease and related disorder management

Several root-invading plant pathogens have been found in symptomatic sweet corn roots, Fusarium oxysporum, F. solani, and Pythium species, but their involvement in the symptoms observed in the field was still unclear (Powelson et al., unpub.) in the spring of 2000.

Objectives:

While Fusarium oxysporum and solani and Pythium arrenhomanes are consistantly associated with diseased roots and Pythium arrhenomanes has been shown to be pathogenic on sweet corn seedings in the greenhouse, other studies suggest neither fungus alone is the cause of this disease. Experiments were conducted in 2000 to determine: 1) pathogenicity of Fusarium isolates and other fungi on sweet corn seedlings, 2) effect of soil treatments (fungicides and herbicides) on severity of root necrosis of corn grown in naturally infested field soil, and 3) effect of c

Objectives:

• Characterize su sweet corn hybrids for reaction to root/crown rot.

Cooperators:

• M. Powelson, Botany and Plant Pathology, Oregon State University
• C. Ocamb, Botany and Plant Pathology, Oregon State University

Objectives:

• Breed Bush Blue Lake green bean varieties with high economic yield.
• Improve pod characteristics including straightness, color, smoothness, texture, flavor and quality retention, and combine with delayed seed size development.
• Incorporate white mold resistance, and improve root rot tolerance while maintaining resistance to bean common mosaic virus.
• Initiate populations to facilitate molecular marker assisted selection of desirable horticultural traits.
• Evaluate novel genetic traits of potential benefit.

The processed vegetable industry has struggled annually with EPA to secure the Ronilan label. EPA announced that the registration will be cancelled in September 30, 2005. There are a number of new fungicides that have not been evaluated for the control of either Botrytis or Sclerotina for snap beans in Oregon. The currently registered alternative fungicides to Ronilan; Benlate, Bravo, Topsin, and Royal, are all subject to review by the EPA under the guidelines set forth in the provisions of the 1996 Food Quality Protection Act.

Cooperators:

Report to the Oregon Processed Vegetable Commission

George Clough, Philip Hamm, and Mike Baune
OSU Hermiston Agricultrual Research and Extension Center

Lindsey du Toit
WSU Mt. Vernon Research and Extension Unit

Objectives:

Principal Investigator: Alexandra Stone
Graduate Student: Heather Darby

SUMMARY

Objectives: Characterize su and se sweet corn hybrids for reaction to root/crown rot.
 

Objectives:

The goal of the project was to verify the results obtained in 2000 field trials and to evaluate other fungicides for their effectiveness in controlling Bean Gray Mold (Botrytis cinerea) and Bean White Mold (Sclerotinia Sclerotiolum) using Ronilan as an industry standard.