The objective of this study was to investigate the effects of pretreatment and drying conditions on plantain varieties, namely French horn and False horn, in a hot air drier at temperature range of 50oC to 80oC.  . Sliced samples from each variety were thoroughly mixed and divided into four groups of which one portion was dipped in citric acid, another in sodium Metabisulphite all for one minute and a third was steam blanched for 10 minutes. The fourth portion was not pretreated and it served as the control.  Drying took place entirely in the falling rate period. Effective moisture diffusivity increased with increased drying air temperature and varied significantly (p < 0.05) with pretreatment. Temperature dependency of moisture on diffusivity was illustrated by the Arrhenius relationship. Over the range of temperature, effective moisture diffusivity varied from 7.54 x 10-10 to 2.37 x 10-9 and 5.17 x 10-10 to 3.11 x 10-9 for French horn and False horn respectively. Activation energy for drying ranged from 11.88 to 33.10 and 26.76 to 44.50 kJ/mol for French and False Horn respectively. The Effect of variety and pretreatment were significant (p < 0.05) on activation energy. The results suggest that citric acid and sodium meta bisulfate pretreatment had a significant impact on the drying and were effective as temperature decreased.