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Factors Affecting Biological Control of Spurred Anoda (Anoda cristata) with Alternaria macrospora

Published online by Cambridge University Press:  12 June 2017

H. Lynn Walker
H. Lynn Walker*
Affiliation:
South. Weed Sci. Lab., U.S. Dep. Agric., Sci. Ed. Admin., Agric. Res., Stoneville, MS 38776
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Abstract

In greenhouse studies, spurred anoda [Anoda cristata (L.) Schlecht.] control by Alternaria macrospora Zimm. was influenced by stage of growth, inoculum concentration, and the temperature and duration of the dew periods following inoculation. Seedlings inoculated at the cotyledon to first-leaf stage were most easily controlled. Optimum dew periods for killing seedlings were ≥ 24 h at 20 to 30 C. Spray mixtures containing 2.5 to 10 × 105 spores/ml gave the best control. In field studies, A. macrospora significantly reduced the number and the dry weight of spurred anoda plants.

Keywords

Biocontrolmycoherbicidebiological weed control
Type
Research Article
Information
Weed Science , Volume 29 , Issue 4 , July 1981 , pp. 505 - 507
Copyright
Copyright © 1981 by the Weed Science Society of America 

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References

Literature Cited

1. Ohr, H. D., Chandler, J. M., and Jordan, T. N. 1975. Destruction of spurred anoda in cotton by a naturally occurring plant disease. Proc. South. Weed Sci. Soc. 28:123.Google Scholar
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