Microdochium panattonianum a pathogen of lettuce in Serbia [Yugoslavia]

Krnjaja, V.; Ivanovic, M.

Microdochium panattonianum a pathogen of lettuce in Serbia [Yugoslavia]

1996

Krnjaja, V. | Ivanovic, M. (Poljoprivredni fakultet, Beograd - Zemun (Yugoslavia))

The etiological study of lettuce anthracnose has shown that the fungus Microdochium panattonianum was causal agent of the disease. The fungus investigates represents an economically important and frequently present pathogen. Under the condition of artificial inoculations, all the fungus isolates from the lettuce proved to be highly pathogenic on the lettuce plants. The host range of Microdochium panattonianum included the lettuce (Lactuca sativa), wild lettuce (Lactuca serriola) and Cichorium endivia. The fungus survived 16 weeks on host debris placing on the surface, at a 10 cm soil depth, and 48 weeks in the lettuce debris kept at 2 m above the ground. The colony of M. panattonianum grown on PDA had a pale pink color. The hyphae were transparent, septane, 3.65 micro m of width. Conidiophores may or may not be formed, 1-2 septate. Conidia of the pathogen had one, rarely two septa and were 14.08 x 4.24 micro m. Optimal temperature growth and sporulation of the pathogen was 15-20 deg C. Optimal pH value for colony development was 4.2-5.2, and the most favourable media for the colony development were corn meal agar. The fungus showed a more favourable colony development in permanent darkness than under permanent light conditions.

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