João Siqueira da Mata

Partial resistance to fruit necrosis associated to Colletotrichum spp. among arabic coffee genotypes

The aim of this study was to evaluate the resistanc e to fruit necrosis associated to Colletotrichum spp. in Coffea arabica L.. Twenty-two arabic coffee genotypes were perfor med in a randomized block design, with three replications and ten plants per plot. They were eva luated for the variables fruit necrosis, luminosity index inside of the plant canopy and fruits per productive nodes of the plants. There was genetic variability for the resistance to fruit necrosis. Different partial resistance levels, varying from highly susceptible (score = 3.89) to moderately resistant (score = 1.77) were observed. The genotyp es that presented moderate resistance were the cult ivars IPR100, IPR-103, IPR-105 and IPR-108 and the coffee se lection IAPAR-00023.

Progênies de Coffea arabica cv. IPR 100 com resistência ao nematóide Meloidogyne incognita raça 1

The objective of this study was to identify progenies of Coffea arabica cv. IPR 100 with resistance to nematode Meloidogyne incognita race 1. The experiment was performed in greenhouse (Londrina, PR, Brazil) with an experimental design of randomized blocks with 3 replications and 15 plants per plot. Six progenies of cultivar IPR 100 were evaluated, and Mundo Novo IAC 376-4 cultivar was used as susceptible control. Five hundred eggs per plant were inoculated, totalizing 7500 eggs per plot of 150 cm2. The number of galls and egg masses in the roots were evaluated. All progenies of cultivar IPR 100 presented more resistance to M.incognita race 1 than the susceptible control.