In response to weevil feeding, the crop produces bitter testing and toxic substance which render stored roots unfit for human consumption. The problem is more prevalent during the dry season
Pofuna kupewa kuwonongedwa ndi nankafumbwe, mbewu imatulutsa zinthu zowawa komanso zokupha zimene zimapangitsa kuti mitsitsi yomwe yasingidwa isakhale yoyenera kudyedwa ndi anthu. Vutoli limakula mu nyengo ya dzuwa