Fig. 2. Production of allantoid secondary sporidia of Tilletia indica under two different icubation regimes (at 20C in the dark and at 23-28 C with a 14-h photoperiod) by teliospores obtained from durum wheat cultivar Altar C84 and infeceted under natural conditions in the Yaqui Valley, Sonora, Mexico, during the crop cycle autumn­winter 2002-03.