Fusarium sp. a causal agent of red clover wilting

Urosevic, B.; Tomic, Z.; Radovic, J. . Centar za krmno bilje

Fusarium sp. a causal agent of red clover wilting

1999

Urosevic, B. | Tomic, Z. | Radovic, J. (Institut za istrazivanja u poljoprivredi "Srbija", Krusevac (Yugoslavia). Centar za krmno bilje)

On the basis of the results obtained, it can be concluded that the studied fungus, isolated from the red clover root and root neck, belongs to the species Fusarium sp. Symptoms expressed on artificially inoculated red clover plants are identical with these ones occurring in nature. On potato-dextrose agar (PDA), the fungus formed a well-developed and compact airy micelium grayish-white with rosy shades in color. Microconidia is 6.2x2.8 micrometer (5-12x2.2-3.5 micrometer) in size. Macroconidia had principally three septa, slightly bent in the upper part. They are 28.3x5.8 micrometer (4-5.5x25-50 micrometer) in size. The dimensions of chlamydospores are 7-11 micrometer. The studied fungus is pathogenic for the following test plants: red clover (80%), lucerne (63%), white clover (67%), soybean (40%), bean (23%), pea (17%), lupinus (13%), and field pea (7%). Colony gren most rapidly on oil-beat agar and potato-dextrose agar. The fungus did not develop well on Czapek's agar, but did it fairly well on all other media. The most intensive sporulation was on PDA and on maize flour agar. Mycelium was predominantly white coloured. Optimal temperature for fungus growth was 23 deg C.

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