This study aimed at exploring the impact of seed hardness and protease activity on the level of susceptibility to S.zeamays by Kenyan hybrid maize seed varieties. Ten varieties comprising of H.614, H.6213, H.6218, PH4, H.513, H.520, H.522, DH02, DH04 and KSTDV-01 were screened for their susceptibility levels. Percentage seed weight loss and Dobie's index of susceptibility were used in the evaluation of susceptibility. Sigma's non-specific protease activity method was applied in the determination of protease activity while a Sun Rheometer Compac-100 series was used to measure hardness across the ten hybrid maize seed varieties. The findings from the study show that harder and high protease ac
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