Articles
REACTION OF PAPAYA (CARICA PAPAYA) GENOTYPES TO FOOT ROT CAUSED BY PHYTOPHTHORA PALMIVORA
Article number
864_33
Pages
249 – 255
Language
English
Abstract
Papaya foot and root rot caused by Phytophthora palmivora, is a serious problem in Bahia and Espírito Santo, the main Brazilian states where this crop is grown.
Ten genotypes (NT Red, Golden, Baixinho de Santa Amália and Sunrise Solo, from the Solo group, and Cross Paris, Tailândia Verde, Tailândia Roxo, Tainung-1, Tailândia Roxão and Sekati, from the Formosa group) were evaluated for resistance to P. palmivora in field and in two pot trials using naturally infested soil from University of Brasílias Experiment Station (Brasília, DF, Brazil). A scale that ranged from 1 (0 to 5% wilting) to 9 (90 to 100% wilting) was used in the field evaluations.
Another scale, ranging from 0 (0% wilting) to 3 (seedling death), was used to evaluate the pot tests. Tailândia Roxão and Cross Paris were the least susceptible genotypes in both field and pot trials, while Baixinho de Santa Amália, Tailândia Verde and Tailândia Roxo reacted differently under field and pot conditions.
All other genotypes were considered susceptible in both tests.
I tappears that resistance is more frequent among the cultivars in the Formosa group.
Ten genotypes (NT Red, Golden, Baixinho de Santa Amália and Sunrise Solo, from the Solo group, and Cross Paris, Tailândia Verde, Tailândia Roxo, Tainung-1, Tailândia Roxão and Sekati, from the Formosa group) were evaluated for resistance to P. palmivora in field and in two pot trials using naturally infested soil from University of Brasílias Experiment Station (Brasília, DF, Brazil). A scale that ranged from 1 (0 to 5% wilting) to 9 (90 to 100% wilting) was used in the field evaluations.
Another scale, ranging from 0 (0% wilting) to 3 (seedling death), was used to evaluate the pot tests. Tailândia Roxão and Cross Paris were the least susceptible genotypes in both field and pot trials, while Baixinho de Santa Amália, Tailândia Verde and Tailândia Roxo reacted differently under field and pot conditions.
All other genotypes were considered susceptible in both tests.
I tappears that resistance is more frequent among the cultivars in the Formosa group.
Authors
A.C. Dianese, L.E.B. Blum, J.B. Dutra, L.F. de Freitas, L.F. Lopes, M.C. de Sena, L. de Lima, O.K. Yamanishi, D.M.S. Martins
Keywords
Phytophthora palmivora, resistance, papaya, Carica papaya
Online Articles (69)