chapter  12
6 Pages

Sesbania Species as Weeds

ByDale O. Evans, Peter P. Rotar

Sesbania species, especially annuals, have the potential to become weeds in field crops. They will compete with crops for light, nutrients, and moisture. Heavy volunteer growth of Sesbania species may interfere with crop harvest by hampering machinery. S. exaltata is a widespread weed of crops in the southern United States. It is a major problem in soybean growing areas, capable of causing as much as 60–80 percent reduction in yield. Studies on the germination and growth of sesbanias have been done in the context of effecting their control. Control is complicated by the fact that both are broadleaved legumes and that soybeans are also sensitive to the same herbicides. Differing soil types and varying susceptibility of the soybean crop at different growth stages require variable rates of both preemergence and postemergence herbicides. Herbicide users must heed the limitations and instructions on the product label and be aware of local laws and regulations governing herbicide use.