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Suppression of cogongrass (Imperata cylindrica) by a bioherbicidal fungus and plant competition

Published online by Cambridge University Press:  20 January 2017

Camilla B. Yandoc ,
Raghavan Charudattan  and
Donn G. Shilling
Raghavan Charudattan
Affiliation:
Plant Pathology Department, University of Florida, Gainesville, FL 32611
Donn G. Shilling
Affiliation:
Mid-Florida REC–Apopka, University of Florida, Apopka, FL 32703
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Abstract

The possibility of using the fungus Bipolaris sacchari as a bioherbicide to suppress cogongrass and to allow the establishment of bahiagrass in cogongrass–bahiagrass mixed plantings was investigated under greenhouse conditions. The bioherbicide was prepared by mixing B. sacchari spore suspension containing 105 spores ml−1 with an oil emulsion composed of 16% horticultural oil plus 10% light mineral oil and 74% sterile water. The bioherbicide caused severe foliar blight in cogongrass and slight phytotoxic damage on bahiagrass. In the first experiment, the bioherbicide reduced cogongrass biomass without affecting bahiagrass biomass. In the second experiment, the bioherbicide caused a 64% reduction in fresh weight, a 74% reduction in the number of rhizomes, and a 47% reduction in the height of cogongrass. The latter experiment also showed an increase in bahiagrass fresh weight in the presence of cogongrass when the bioherbicide was applied. This study indicates the potential of combining bioherbicide application with competition from a desirable grass species as a strategy for the integrated management of cogongrass.

Keywords

Bahiagrass, Paspalum notatum Fluegge var. saurae Parodi PASNO ‘Pensacola’Bipolaris sacchari (E. J. Butler) Shoemakercogongrass, Imperata cylindrica (L.) Beauv. IMPCYBiological controlbioherbicidecompetition
Type
Weed Management
Information
Weed Science , Volume 52 , Issue 4 , August 2004 , pp. 649 - 653
Copyright
Copyright © Weed Science Society of America 

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