Life cycle and morphological identification of Globodera spp. related to potato (Solanum tuberosum L.) phenology in Nariño, Colombia

Nematodes of Globodera genus are considered one the most important and limiting pests for potato crops, since these pathogens difficult to control cause losses between 20 50% production. The study was carried out in areas Túquerres Contadero, belonging department Nariño, Colombia, where cysts were collected by taking soil samples obtaining immature females after observing plants roots. Photographic records symptoms corresponding nematode presence during phenological development crop also taken. This order determine present specie mentioned studying morphological characters such as: nodules shape stylet, stretch marks vulva anus female color change towards cyst formation relate biological cycle pathogen with host. Cysts viability tests out, active larvae J2 state. evaluated results corresponded pallida species no evidence rostochiensis found samples. Refering observed field, there chlorosis, yellowish spots on foliage little growth. appearance coincides stage flowering, which occurs 90 days plant emergence.