The occurrence of greening in potato tubers was evaluated through two evaluation methods (visual scale of notes and spad index). The experimental design was a completely randomized, with four replications. Treatments were disposed in the factorial sceme 18x5, constituted of potato cultivars (Agata, Apuã (IAC-5977), Aracy (IAC-2), IAC Aracy Ruiva, Asterix, Bintje, Dali, Clone IAC-6090, Itararé (IAC-5986), Laguna, Remarka, Liseta, Mondial, Novita, Oscar, Picasso, Santana and Solide) and storage time (5; 10; 15; 20 and 25 days). All potato cultivars presented positive linear effects when evaluated through the spad index, except 'Bintje', with average spad index of 1,23. For the visual scale, quadratic and linear effects were verified. 'Bintje' is resistant to the greening when evaluated by both methods. The spad index can be used for determining of the greening from 10º to the 25º day of storage.
Solanum tuberosum; tubers; physiological disturbs; greening; methods
