Soil Fungicides for Controlling Chytridiaceous Mycoparasites of Gigaspora margarita and Glomus fasciculatum

Author:

Sylvia David M.1,Schenck N. C.1

Affiliation:

1. Department of Plant Pathology, University of Florida, Gainesville, Florida 32611

Abstract

The percentage of azygospores of Gigaspora margarita with zoosporangia of chytridiaceous fungi (CF) was reduced significantly after agitating them in fenaminosulf before incubation in soil. Fenaminosulf did not affect zoosporangia development on chlamydospores of Glomus fasciculatum. Metalaxyl and ethazol were not effective against CF on spores of either mycorrhizal fungus. Azygospores of G. margarita were treated with fenaminosulf and used as the inoculum for pot cultures. After 19 weeks, the percentage of azygospores containing CF was reduced significantly by this treatment, whereas root colonization and sporulation by the mycorrhizal fungus were unaffected. Pot cultures of G. margarita , either drenched with fenaminosulf or not, did not differ in the percentage of azygospores containing CF. However, root colonization and sporulation by the mycorrhizal fungus was temporarily delayed when pots were drenched with fenaminosulf.

Publisher

American Society for Microbiology

Subject

Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology

Reference10 articles.

1. Hyperparasitism of vesicular-arbuscular mycorrhizal fungi;Daniels B. A.;Phytopathology,1980

2. Spores of mycorrhizal Endogone species extracted from soil by wet sieving and decanting;Gerdemann J. W.;Trans. Br. Mycol. Soc.,1963

3. An evaluation of techniques for measuring vesicular-arbuscular mycorrhizal infection in roots;Glovannett L;New Phytol.,1980

4. Hogland D. R. and D. I. Arnon. 1950. The waterculture method for growing plants without soil. Circular 347. California Agricultural Experiment Station Berkeley.

5. Little T. M. and F. J. Hills. 1972. Statistical methods in agricultural research. University of California Davis.

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