Claudionor Ribeiro Filho

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.

Coffee Berry Borer Resistance in Coffee Genotypes

The aim of this study was to evaluate the coffee germplasm of the Parana Agronomic Institute (IAPAR) for resistance to the coffee-berry-borer. Preliminary field evaluation was performed in August 2004 and the fruits of less damaged genotypes in the field were evaluated under controlled condition with obligated and free choice experiments established in a randomized complete design with three replications. The genotypes were evaluated fifteen days after infestation with one borer per fruit in Petri dishes. The data were analyzed by the Scott-Knott means test at 1 % and by the χ2 test. Statistical analysis indicated that Coffea kapakata, Psilanthus bengalensis, C. eugenioides and genotypes with C. eugenioides genes were resistant. These genotypes presented low frequency of bored grains. C. eugenioides and C. kapakata could present resistance at epicarp level but not in the grain. P. bengalensis could present resistance also in the grains.