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Factors that Influence Germination and Mycoherbicidal Activity of Alternaria cassiae

Published online by Cambridge University Press:  12 June 2017

Donald J. Daigle  and
Peter J. Cotty
Donald J. Daigle
Affiliation:
South. Reg. Res. Cent. U.S. Dep. Agric. Res. Serv., New Orleans, LA 70179
Peter J. Cotty
Affiliation:
South. Reg. Res. Cent. U.S. Dep. Agric. Res. Serv., New Orleans, LA 70179
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Abstract

The influences of pH, surfactants, and nutrients on germination were investigated to develop a basis for improvement of Alternaria cassiae mycoherbicide formulations. In vitro results indicated that a formulation with a pH of approximately 6.5 containing 0.1 to 1% Tween 80, 0.02 M potassium phosphate buffer, and 1% dehydrated potato dextrose broth best promoted germination. Sicklepod plants at the 2 to 3 true-leaf stage were sprayed with test solutions, incubated in the dark at 100% relative humidity (28 C) for 6 h, and placed in a growth chamber maintained at 30 C. Assessment of the plants after 2 d indicated that the ability of the formulation components to induce germination of Alternaria cassiae in vitro corresponded well with their ability to improve infection of sicklepod seedlings.

Keywords

Sicklepod, Cassia obtusifolia L. ♯ CASOBBiological controlpHpotato dextrose brothCASOB
Type
Research
Information
Weed Technology , Volume 5 , Issue 1 , March 1991 , pp. 82 - 86
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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