Threshold of Heterodera glycines in soybeans
Investigations were conducted in Iowa, US, to establish a damage threshold for Heterodera glycines (EPPO A1 organism) in soybeans. In course of the investigations it was found that damage due to H. glycines in naturally infested fields accounted for 6 - 39% yield losses. Experiments in artificially infested microplots gave a damage threshold between 10 and 50 eggs and a yield reduction of 52 and 19% at the highest egg density in 1986 and 1987, respectively.
Sources
Niblack, T.L.; Baker, N.K.; Norton, D.C. (1992) Soybean yield losses due to Heterodera glycines in Iowa.
Plant Disease 76, 943-948.