Isolation, identifcation and yield losses associated with sudden death syndrome in soybeans in Argentina
The main objectives of this work were to isolate and identify the causal agents of sudden death syndrome [SDS] from samples collected in different Argentinean localities, to quantify its incidence, and to estimate yield losses. Two hundred and ffteen roots from plants with typical SDS foliar symptoms were analyzed. In order to perform pathogenicity tests, two bioassays were conducted in the greenhouse. Yield losses were estimated in a feld trial located in Pergamino by quantifcation and comparison of yield of paired samples. Thirty-six percent of total roots [78 roots] presented signs of Fusarium, compatible with signs caused by SDS. Morphological studies allowed the identifcation of 35 isolates as F. tucumaniae and 18 as F. virguliforme. Other eight isolates could not be identifed. All isolates that were inoculated reproduced typical SDS foliar symptoms. Signifcant differences were observed between healthy and diseased plants for 1000-grain weight and between potential and real yield [p less than 0.05]. Average yield loss was 1514 kg/ha [range 192-3770 kg/ha]. These results corroborated the distribution and predominance of F. tucumaniae and F. viguliforme in the area under study and its destructive potential.
| Main Authors: | , , , , , , , , , , , |
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| Format: | Texto biblioteca |
| Language: | spa |
| Subjects: | FUSARIUM TUCUMANIAE, FUSARIUM VIRGULIFORME, GLYCINE MAX, SDS, |
| Online Access: | http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=46557 |
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| Summary: | The main objectives of this work were to isolate and identify the causal agents of sudden death syndrome [SDS] from samples collected in different Argentinean localities, to quantify its incidence, and to estimate yield losses. Two hundred and ffteen roots from plants with typical SDS foliar symptoms were analyzed. In order to perform pathogenicity tests, two bioassays were conducted in the greenhouse. Yield losses were estimated in a feld trial located in Pergamino by quantifcation and comparison of yield of paired samples. Thirty-six percent of total roots [78 roots] presented signs of Fusarium, compatible with signs caused by SDS. Morphological studies allowed the identifcation of 35 isolates as F. tucumaniae and 18 as F. virguliforme. Other eight isolates could not be identifed. All isolates that were inoculated reproduced typical SDS foliar symptoms. Signifcant differences were observed between healthy and diseased plants for 1000-grain weight and between potential and real yield [p less than 0.05]. Average yield loss was 1514 kg/ha [range 192-3770 kg/ha]. These results corroborated the distribution and predominance of F. tucumaniae and F. viguliforme in the area under study and its destructive potential. |
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