Resumo

ESPINOSA CUELLAR, Ernesto et al. Depressive effect of the causative agents of dry rot in plants grown in vitro from malanga (Xanthosomasagittifolium). Rev. colomb. biotecnol [online]. 2011, vol.13, n.2, pp.155-161. ISSN 0123-3475.

Depressive effect was determined on plants produced in vitro taro cultivar ‘Amarilla Especial’, fungi Fusariumoxysporum Schlecht, Rhizoctoniasolani Kühn and Sclerotiumrolfsii Sacc isolated from infected plants with symptoms of poor development, chlorosis, leaf necrosis and rot the roots. Treatments consisted of the isolation of the three fungi separately, the mixture of the three fungi and uninoculated control. Previously acclimatized plants were planted in chambers had dimensions 0,90 × 0,90 × 0,90 m, in randomized complete block with four replications. 100 plants were inoculated for each treatment and control is left as an equal number of uninoculated plants was evaluated in each case the plant height, number of roots per plant and number of diseased roots and subsequently determined the fresh weight and dry the roots and foliage. Was harvested at 10 months after planting and assessed some components of performance, as the number of corms and cormels and their fresh weight, as the intensity of damage at the time of harvest. The results showed that the fungal pathogens Fusariumoxysporum Schlecht, Rhizoctoniasolani Kühn and Sclerotiumrolfsii Sacc associated with dry rot caused a depressive effect on taro plants grown in vitro produced cameras. The mixture of these three fungi was very aggressive, resulting in reduced plant height, fresh weight of leaves and number of roots, corms and cormels.

Palavras-chave : Taro; dry rot; fungus.

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