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Potential Biological Control Agents for Goosegrass (Eleusine indica)

Published online by Cambridge University Press:  12 June 2017

Suzanne S. Figliola ,
N. D. Camper  and
W. H. Ridings
Suzanne S. Figliola
Affiliation:
Dep. Plant Pathol. and Physiol., Clemson Univ., Clemson, SC 29634-0377
N. D. Camper
Affiliation:
Dep. Plant Pathol. and Physiol., Clemson Univ., Clemson, SC 29634-0377
W. H. Ridings
Affiliation:
Dep. Plant Pathol. and Physiol., Clemson Univ., Clemson, SC 29634-0377
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Abstract

Two leaf-spotting pathogens, [Bipolaris setariae (Saw.)] and [Piricularia grisea (Cke.) Sacc.], were isolated from severely infected goosegrass plants. Pathogenicity tests conducted at 28 C showed that both fungi were 100% effective in infecting goosegrass when given a 72-h dew period. Dew period temperature and duration requirements were tested by inoculating 2-week-old plants with conidial suspensions of each fungus and incubating them in dew chambers (100% relative humidity). Disease index increased as dew period duration increased for both fungi and at all temperatures tested. Infection occurred at all temperatures with an optimum of 24 to 28 C for B. setariae and 28 C for P. grisea. In host range tests, representative plants of the Fabaceae, Malvaceae, Poaceae, and Solanaceae were inoculated with suspensions of either 20 000 or 60 000 spores/ml of each fungus and placed in growth chambers at 28 C. Infection was limited to members of the Poaceae. Sorghum showed a hypersensitive response to B. setariae. Both cultivars of corn developed light symptoms in response to both fungi at 20 000 and 60 000 spores/ml.

Keywords

Goosegrass, Eleusine indica (L.) Gartner. # ELEINFungal pathogensmycoherbicidesELEIN
Type
Special Topics
Information
Weed Science , Volume 36 , Issue 6 , November 1988 , pp. 830 - 835
Copyright
Copyright © 1988 by the Weed Science Society of America 

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