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Influence of Selected Adjuvants on Disease Severity by Phoma herbarum on Dandelion (Taraxacum officinale)

Published online by Cambridge University Press:  12 June 2017

Silke Neumann  and
Greg J. Boland
Silke Neumann*
Affiliation:
Environmental Biology, University of Guelph, Guelph, ON NIG 2W1, Canada
Greg J. Boland
Affiliation:
Environmental Biology, University of Guelph, Guelph, ON NIG 2W1, Canada
*
Corresponding author's E-mail: sneumann@em.agr.ca.
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Abstract

Phoma herbarum was evaluated as a potential biological control agent for dandelion (Taraxacum officinale) in turf. A preliminary controlled environment study identified selected adjuvants that enhanced disease severity by P. herbarum. Subsequently, these adjuvants were evaluated for disease enhancement under field conditions. Adjuvants evaluated included gluten flour, liposome, guar gum from ground guar (Cyamopsis tetragonoloba), durum (Triticum durum), and pectin. Regression analysis revealed a significant (P = 0.05) increase in disease severity by P. herbarum when formulated with gluten Hour, guar gum, or durum semolina compared to treatment with 20% mycelium in potato (Solanum tuberosum) dextrose broth (PDB) alone. No phytotoxicity to dandelion was observed among the adjuvant controls.

Keywords

Phoma herbarum Westenddandelion, Taraxacum officinale Weber in Wiggers ♯ TAROFpotato, Solanum tuberosum L.guar, Cyamopsis tetragonoloba (L.) Taub.durum wheat, Triticum durum DesfBiological weed controlbioherbicidemycoherbicideefficacy improvementformulationBWCA, biological weed control agentDPI, days postinoculationDSR, disease severity ratingPDB, potato dextrose brothWPI, weeks postinoculation
Type
Research
Information
Weed Technology , Volume 13 , Issue 4 , December 1999 , pp. 675 - 679
Copyright
Copyright © 1999 by the Weed Science Society of America 

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