Evaluation of thirty Indonesian chili varieties for resistance to Phythopthora capsici

Abstract

Abstract The disease caused by P. capsici can attack all tissue and growth phases of the chili plant with the yield loss up to 100%. The research aimed to evaluate the resistance response of thirty Indonesian chili varieties against P.capsici that have been carried out at the IVEGRI research station - Lembang, West Java since April until July 2020. The selection method was carried out using the artificial inoculation. A total of 10 ml of zoospores with a density of 106 were inoculated on chili seedlings five weeks after sowing. The observations were carried out by scoring symptoms that appeared (score 0 to 5) five times. The observation was carried out at 7 to 35 days after inoculation with intervals of 7 days. Based on disease severity (DS), the resistances of varieties were grouped into three levels, namely resistant (DS<20%), moderately resistant (20%<DS<50%), and susceptible (DS>50%). The result showed variations on symptoms, scoring, and the time of symptom appearance in and between the varieties tested. The evaluation result showed that 24 varieties were resistant, 5 moderately resistant, and 1 susceptible to P. capsici.