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B.‐G. Hong et al., Physics of Fluids B: Plasma Physics 3, 1638 (1991) https://doi.org/10.1063/1.859683, By an electromagnetic incompressible two-fluid model describing both ion temperature gradient drift modes (ηi modes) and resistive interchange modes (g modes), a new type of ηi mode is studied in cylindrical geometry including magnetic shear and an averaged curvature of Heliotron/Torsatron. This ηi mode is destabilized by the coupling to the unstable g mode. Finite plasma pressure beta increases the growth rate of this mode and the radial mode width also increases with plasma pressure beta indicating large anomalous transport in the Heliotron/Torsatron configuration. The transport from ηi mode exceeds that from resistive g when the mean-free-path exceeds the machine circumference. For plasma beta above two to three times the Suydam limit, the m = 1/n = 1 growth rate increases from the ηi mode value to the magnetohydrodynamic (MHD) value. © 1991 American Institute of Physics.