Effects of Meloidogyne hapla and M. arenaria on black rot severity in new Cylindrocladium-resistant peanut genotypes

Greenhouse and microplot experiments were done to determine the effects of Meloidogyne hapla and M. arenaria on the severity of Cylindrocladium black rot (CBR), caused by Cylindrocladium crotalariae, in the peanut (Arachis hypogaea) genotypes Florigiant, NC 10C, NC Ac 18416, and NC Ac 18016. In the greenhouse, severity of black rot was increased in Florigiant by either M. hapla or M. arenaria in treatments with fungal inoculum densities of 0.05 and 0.5 microsclerotia per gram of soil (.)