root-eating
• (a.) Feeding on roots; root-eating.
Rhi·zoph'a·gous adjective [ Greek .........; ......... a root + ......... to eat.] Feeding on roots; root- eating. 
rhizophagous, rhizophagy 1. Feeding on roots. 2. A reference to a plant that obtains nourishment through its own roots.
feeding on roots