Because of parasitic nematodes and fungi many Iowa farmers are not getting nearly the quantity of hay that alfalfa is capable of producing. Hay losses from these pests and diseases cost several million dollars annually.
Norton, D. C.; Lambe, R. C.; and WIlsie, C. P.
"Nematodes and Fungi Are Cutting Hay Yields,"
Iowa Farm Science: Vol. 20
, Article 2.
Available at: https://lib.dr.iastate.edu/farmscience/vol20/iss3/2