Testing the Inhibitory Effect of Streptomyces spp. on the Growth of Colletotrichum gloeosporioides the Causal Agent of Anthracnose in Chili

Abstract

Isolation of Streptomyces spp. was conducted from soil in chili cultivation areas with anthracnose disease outbreaks. A total of 146 isolates of Streptomyces spp. were obtained and tested for their ability to inhibit Colletotrichum gloeosporioides the causal agent of chili anthracnose, using the dual culture test on Potato Dextrose Agar (PDA). The results showed that the 146 isolates of Streptomyces spp. exhibited an average inhibition percentage against Colletotrichum gloeosporioides ranging from 34.33% to 59.89%. The five most effective isolates in inhibiting the fungal pathogen were KSAB15, KSAB13, KSAB12, KSCB09, and KSCB10, with inhibition percentages of 59.89%, 59.65%, 58.56%, 57.67%, and 56.56%, respectively.