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Title: ASSESSMENT OF VIRULENCE OF ACREMONIUM CUCURBITACEARUM USING MULTIPLE COLONY FORMING UNITS AND PLANT RESPONSES

Author
item Popham, Thomas
item Bruton, Benny
item ARMENGOL, J. - UNIVERSIDAD POLITECNICA
item GARCIA-JIMENEZ, J. - UNIVERSIDAD POLITECNICA

Submitted to: American Phytopathological Society
Publication Type: Abstract Only
Publication Acceptance Date: 5/19/1998
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Plant response to soil-borne pathogens is determined by host-plan resistance, pathogen density, virulence, and environment. Assessment of plant response is critical to assess relative fungal virulence. Muskmelon response variables of hypocotyl (RH), root-stem junction (RSR), primary root (R1R), secondary roots (R2R), and measurements of leaf area (LA), were emade on plants exposed to different levels (1, 10, 20, 30, 40, or 50 X 100 CFU/ g of soil) of inoculum of Acremonium cucurbitacearum. Scaling of the leaf area (RLA) to the same scale of the ratings (1-5) and averaging provides a single value, Disease Severity Index (DSI), which combines all measured plant responses. Simple linear regression of RH, RSR, R1R, R2R, RLA, and DSI over CFU allows comparison between any single rating parameter. The intercept and slope of the regression models distinguished isolates.