Abstract

BETANCOURTH, Carlos et al. Life cycle and morphological identification of Globodera spp. related to potato (Solanum tuberosum L.) phenology in Nariño, Colombia. Rev. Cienc. Agr. [online]. 2021, vol.38, n.1, pp.97-110.  Epub Aug 29, 2021. ISSN 0120-0135.  https://doi.org/10.22267/rcia.213801.147.

Nematodes of Globodera genus are considered one of the most important and limiting pests for potato crops, since these pathogens are difficult to control and cause losses between 20 and 50% of potato production. The study was carried out in Túquerres and Contadero, department of Nariño, Colombia. In these areas, cysts were collected by taking soil samples, obtaining immature females after observing the roots of potato plants and taking photographic records of symptoms in the crop. This study was carried out to determine the presence of nemathodes by studying their morphological characters such as: stylet´s nodules shape e, stretch marks between the vulva and anus, the female color change towards the cyst formation, and the relationship between pathogen and host. Cysts viability tests were carried out, obtaining active larvae in J2 state. The findings confirm Globodera pallida species and no evidence of Globodera rostochiensis. There were chlorosis, yellowish spots on the foliage, and dwarf plants. The appearance of immature females coincides with the phenological stage of flowering, which occurs 90 days after the seeds sprouted.

Keywords : cyst; Globodera; golden nematode; morphological characters; pallida; potato; samplings..

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