INTERRELATIONSHIP OF HETERODERA-GLYCINES AND FUSARIUM-SOLANI IN SUDDEN-DEATH SYNDROME OF SOYBEAN

Experiments were established in field microplots to examine the associ ation between Heterodera glycines and the blue form of Fusarium solani in sudden death syndrome of soybean (SDS). Foliar disease symptoms oc curred on more plants per plot, appeared 3 to 7 days earlier, and were more severe on plants grown in plots infested with F. solani + H. gly cines than on those inoculated with F. solani only. Yields were suppre ssed only in treatments that included the nematode. Numbers of H. glyc ines cysts and second-stage juveniles were significantly lower in plot s infested with F. solani + H. glycines than with the nematode alone. Fusarium solani was able to infect cysts and eggs.