<b>Resistance of cotton cultivars to root-knot nematode</b> - DOI: 10.4025/actasciagron.v27i4.1680

Abstract

Meloidogyne incognita is an important pathogen of cotton in Brazil. There is limited information on resistance to Meloidogyne incognita. An experiment was carried out under greenhouse conditions to evaluate resistance of six cotton cultivars (Coodetec 401, CNPA ITA 90, Delta Opal, IAC 23, Fiber Max 986, BRS Facual) to root-knot nematodes (Meloidogyne incognita). The experimental design was randomized complete blocks with 7 treatments (cotton cultivars and susceptible tomato as control) and 20 replications. Fifty nine days after inoculation, the plants were removed carefully from pots and the number of galls, number of egg mass, number of eggs and Pf/Pi (final population/initial population) were recorded and calculated. Although none of the materials was resistant to the nematode, the cultivar IAC 23 presented lower number of galls and egg mass when compared to the other cotton cultivars (BRS Facual, Coodetec 401, Delta Opal and Fiber Max 1986).