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| Cunha,Marcos G.; Rizzo,David M.. |
| A new potato tuber disease has been observed in the Tulelake region, California, USA, since 1995, with tuber symptoms suggestive of silver scurf disease (Helminthosporium solani). In this work we isolated, identified and demonstrated the nature of the causal agent of this potato disease in California. In addition, the distribution of H. solani in potato fields and the inoculum potential at harvest time were investigated. Disease progress and H. solani spore populations were also characterised under commercial storage conditions. The main fungal genera associated with potato tubers in storage were Helminthosporium solani, Colletotrichum sp., Fusarium sp., and Rhizoctonia sp. The results of Koch's postulates indicated that H. solani is responsible for the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Solanum tuberosum; Helminthosporium solani; Disease progress; Post-harvest disease; Potato tuber disease; Spore population. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362004000400005 |
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| Silveira,José R.P.; Duarte,Valmir; Moraes,Marcelo G.; Lopes,Carlos A.; Fernandes,José M.; Barni,Valmor; Maciel,João L.N.. |
| The objectives of this study were to evaluate the progress of Ralstonia solanacearum bacterial potato wilt biovar 2 (race 3) in 14 potato (Solanum tuberosum L.) cultivars or clones, the resistance of potato clone MB 03 (selected in Brasília, Brazil) to race 1 of R. solanacearum, and the occurrence of the pathogen in tubers harvested from asymptomatic potato plants. During the spring (September to the end of November in the southern hemisphere) of 1999 and 2000, 14 cultivars or clones were grown in a field naturally infested with R. solanacearum biovar 2, in Caxias do Sul, RS. The number of wilted potato plants was recorded each week and a disease progress curve plotted, the resistance of the potato genotypes to bacterial wilt being evaluated by determining... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacterial wilt; Disease progress; Latent infection; Logistic; Monomolecular; Gompertz. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582007000300001 |
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