Hostname: page-component-745bb68f8f-lrblm Total loading time: 0 Render date: 2025-01-08T09:06:49.790Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access Rights & Permissions [Opens in a new window]

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 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Literature Cited

1. Bannon, J. S., and Walker, H. L. 1987. Influence of non-ionic surfactants and non-phytotoxic crop oils on control of sicklepod by Alternaria cassiae . Proc. South. Weed Sci. Soc. 40:288.Google Scholar
2. Cartwrighu, R. D., and Templeton, G. E. 1988. Biological limitations of Protomyces gravidus as a mycoherbicide for giant ragweed, Ambrosia trifidia . Plant Dis. 72:580–582.Google Scholar
3. Cotty, P. J. 1987. Evaluation of cotton cultivar susceptibility to Alternaria leaf spot. Plant Dis. 71:1082–1084.CrossRefGoogle Scholar
4. Cotty, P. J. 1987. Temperature-induced suppression of Alternaria leaf spot of cotton in Arizona. Plant Dis. 71:1138–1140.CrossRefGoogle Scholar
5. Daigle, D. J., and Connick, W. J. Jr. 1990. Recent advances in formulation and application technology for microbial weed control. Am. Chem. Soc. Symp. Ser. Biological weed control using microbes and microbial products as herbicides. In Hoagland, R. E. (ed.) Microbes and Microbial Products as Herbicides. ACS Symp. Ser. 439. Chap 16: 288–304.Google Scholar
6. Daigle, D. J., Connick, W. J. Jr., Quimby, P. C. Jr., Evans, J., Trask-Morrell, B., and Fulgham, F. E. 1990. Invert emulsion: carrier and water source for the mycoherbicide, Alternaria cassiae . Weed Technol. 4: 327–331.Google Scholar
7. Mitchell, J. K. 1988. Gibbago trianthemae, a recently described hyphomycete with bioherbicide potential for control of horse purslane (Trianthema portulacastrum). Plant Dis. 72:354–355.Google Scholar
8. Quimby, P. C., Fulgham, F. E., Boyette, C. D., and Connick, W. J. Jr. 1988. An invert emulsion replaces dew in biocontrol of sicklepod–a preliminary study. In Houde, D. A. and Beestman, G. B. (eds.). Pesticide formulations and application systems: Eighth Volume, ASTM STP 980. American Society of Testing and Materials, Philadelphia, PA.Google Scholar
9. Robinson, R. A., and Stokes, R. H. 1959. Electrolyte Solutions. 2nd ed., Academic Press, Inc., New York.Google Scholar
10. Templeton, G. E., TeBeest, D. O., and Smith, R. J. 1979. Biological weed control with mycoherbicides. Annu. Rev. Phytopathol. 17: 301–310.Google Scholar
11. Walker, H. L. 1981. Factors affecting biological control of spurred anoda (Anoda cristata) with Alternaria macrospora . Weed Sci. 29: 505–507.Google Scholar
12. Walker, H. L., and Riley, J. A. 1982. Evaluation of Alternaria cassiae for the biocontrol of sicklepod (Cassia obtusifolia). Weed Sci. 30: 651–654.Google Scholar
13. Wymore, L. A., and Watson, A. K. 1986. An adjuvant increases survival and efficacy of Colletotrichum coccodes, a mycoherbicide for velvetleaf (Abutilon theophrasti). Phytopathology 76:1115–1116.Google Scholar