Avaliação de variedades de feijão-caupi ao parasitismo de Meloidogyne incognita.

Abstract

The Bean culture (Vigna unguiculata L.) of wide adaptation the various climatic conditions of Brazil, is of fundamental importance for the socio-economic development of the north and northeast regions. However, its productivity has been limited by several biotic factors, the example of the nematodes. In this way, the objective of this work was to evaluate the reaction of fourteen varieties of beans-cowpea: Bastiãozinho; Mosqueado; Maravilha; Balinha; Garanhão; Sempre verde; Canapuzinho; Canapu branco; Paulistinha; Pujante; Canapu V. Roxa; Rajado PE; Costela de Vaca and Setentão as to the parasitism to Meloidogyne incognita. The experiment was conducted in a greenhouse at UFCG/CCTA. The design was entirely randomized, with sixteen treatments and five repetitions. To simulate an infested field condition, tomato seedlings "cv. Santa Clara" were inoculated with 5,000 eggs/juveniles of the Nematode and, kept in pots for 60 days. Soon after, the tomato plants were replaced by sowing the different Creole varieties of cowpea beans. The evaluations were carried out sixty days after the emergence of the bean, being quantified the parasitic actions in the root system and the main agronomic characteristics of the culture. All accesses from Bean were presented as susceptible to nematode, with larger reproduction factor the varieties: 14.08 Pujante and Costela de vaca with 10.10. However, the Paulistinha access was shown to be moderately resistant. The results make it possible to warn the bean growers that the presence of this species of nematode with these accesses without resistance, in a short time may cause considerable economic damage.