Rhizopus arrhizus Fischer: cause of soft root rot in the sugarbeet in Andalucia [in Spain]
1999
Ramirez de Lara, M.C. | Ayala Garcia, J. (AIMCRA, Sevilla (Spain))
Autumn sown beet crops register a drop of richness at the end of their cycle. This depends on, among other variables, the appearance of soft root rot. Both conditions are related to high temperatures. The soft rot that appears in these beets is commonly called "cocido do la remolacha". It is characterised by the appearance of brownish-grey lesions in the main root in the petiole insertion area. As the disease advances from the crown downwards, the tissue becomes brown and spongy both superficially and internally. Mycelium appears on the root surface, which is first white and then dark, along with a wine smelling frothy fluid. During the summers of 1996 and 1997 three pathogenic tests were performed on to isolates of Rhizopus arrhizus using different beet varieties. These tests were carried out in laboratory under controlled conditions, through the artificial inoculation of fungus spores. The Rhizopus arrhizus isolates used were Rp 10-94, from Jerez de la Frontera (Cadiz) and Rp 86-96, from La Luisiana (Sevilla). At the moment of inoculation, the test plants were between three and four months old. The results obtained indicate that Rhizopus arrhizus is a pathogenic beet fungus capable of producing "soft rot" of the root. In addition to the demonstrating fungus pathogenesis, it was shown that the aggressiveness of the attack depended on the presence or absence of beet root injuries, the variety of beet used and fungus strain inoculated.
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