Abstract

ARCILA ARISTIZABAL, Ivón Magaly et al. Effect of Spongospora subterranea f. sp. subterranea Infection on Alternate Hosts. Rev. Fac. Nac. Agron. Medellín [online]. 2014, vol.67, n.2, pp.7261-7269. ISSN 0304-2847.  https://doi.org/10.15446/rfnam.v67n2.44167.

Trap crops have been considered an alternative strategy to reduce the inoculum of soil pathogens such as Spongospora subterranea f.sp. subterranea. In this work, the incidence of this pathogen was evaluated at three consecutive sowings using different alternative hosts. Plants were sown in pots containing 2 kg of soil inoculated with 1x105 cystosori per gram and harvested every three months. Roots were tested for the presence of cystosori and zoosporangia using light microscopy observations with trypan blue (0.05%) and Real-time PCR (qPCR). Data fitting was performed using Exponential and monomolecular models. According to the estimated incidence values of pathogen structures, plant species Cyphomandra betacea, Physalis peruvianum, Solanum nigrum, Allium cepa, Solanum quitoense and Rumex crispus, significantly reduced the amount of cystosori and zoosporangia after the three consecutive sowings. In contrast, Petroselinum crispum, Pennisetum clandestinum, Zea mays and Solanum lycopersicum increased the incidence of S. subterranea f. sp. subterranea.

Keywords : Powdery scab; Solanum tuberosum; trap crops; crop rotation.

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