PENETRATION AND DEVELOPMENT OF MELOIDOGYNE-INCOGNITA RACE-1 AND MELOIDOGYNE-JAVA']JAVANICA IN SUSCEPTIBLE AND RESISTANT VEGETABLES

Penetration and post-penetration development of M. incognita race l and M. javanica juveniles in roots of susceptible and resistant cabbage (Brassica oleracea var. capitata), cauliflower (Brassica oleracea var. botrytis), cucumber (Cucumis sativus), pepper (Capsicum annuum), and tomato (Lycopersicon esculentum) were examined for 30 days. Significant differences in rate of juvenile penetration, total juvenile penetration, and development of juveniles into mature females, were found between susceptible and resistant germplasm. Root penetration by second-stage juveniles of M. incognita race l and M. javanica in resistant germplasm was significantly less than in susceptible cultivars of the vegetables. Ingressed juveniles of M. incognita race l and M. javanica in the roots of resistant germplasm did not develop normally. The development of J2 into J3/J4 or immature adults was delayed and only a few matured into adult females. Females in resistant germplasm were diminutive in size and abnormal in shape.