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Biocontrol of Sicklepod (Cassia obtusifolia) in Soybeans (Glycine max) with Alternaria cassiae

Published online by Cambridge University Press:  12 June 2017

H. Lynn Walker
Affiliation:
South. Weed Sci. Lab., Agric. Res. Serv., U.S. Dep. Agric., Stoneville, MS 38776
C. Douglas Boyette
Affiliation:
South. Weed Sci. Lab., Agric. Res. Serv., U.S. Dep. Agric., Stoneville, MS 38776

Abstract

In four tests conducted in 2 years, Alternaria cassiae Jurair and Khan effectively controlled sicklepod (Cassia obtusifolia L. ♯ CASOB) as indicated by stand counts of the weed and by soybean [Glycine max (L.) Merr.] yields. The number of sicklepod seedlings was reduced more than 90% within 14 days after foliar applications of A. cassiae conidia were banded (46 cm) at rates of 4.2 and 2.1 kg/ha (9.4 and 4.7 kg/ha broadcast, respectively). One banded application of 0.04 or 0.4 kg/ha (0.09 or 0.9 kg/ha broadcast, respectively) did not satisfactorily control sicklepod. These results indicate that sicklepod control may be enhanced by multiple applications of A. cassiae.

Type
Weed Control and Herbicide Technology
Copyright
Copyright © 1985 by the Weed Science Society of America 

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References

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