Ruben M. Gapasin
Pre-infectional resistance was indicated by fewer nematodes which penetrated the resistant cultivars Jasper, Jewel and W-86 compared to those which entered the susceptible cultivars Binicol and UPR. Post-infectional resistance was shown by delayed or retarded development of nematodes after penetration in Jasper and Jewel or to non-development to maturity in W-86.
The number of eggs per egg mass and the size of egg-laying females in susceptible cultivars were significantly greater that those in resistant cultivars Jasper and Jewel.
Keywords: Sweet potato. Pre- and post-infectional resistance. Meloidogyne incognita. M. javanica.
Annals of Tropical Research 8(4):(1986)