Caracterização morfofisiológica de Corynespora cassiicola (Berk. e Curt.) Wei isolado de três hospedeiros no Amazonas

Abstract

Corynespora cassiicola has been related causing damages in several crops of economic importance in Amazonas State, principally Solanaceae and Cucurbitaceae families affecting production by significative form. This study aimed to characterize C. cassiicola isolates through colony morphology, sporulation, mycelial growth and spore dimension on culture media PDA, PSA, OEA and CA. Five mm-diameter disks taken from colonies grown on PDA medium for 15 days were transferred to Petri dishes containing each medium under room temperature and continuous light. The study was installed using randomized block design in a factorial 4 x 5 x 3 (culture media x isolates x hosts) with five replications. The effects of culture media varied to isolates of same host and among different hosts. Mycelial growth was observed in CA. The most spore production was observed in PDA and PSA media. A high variation of aspect and colonies coloration was observed among same host isolates and isolates of different hosts in all culture media. Variation trough spore dimension of C. cassiicola isolates was observed in all culture media tested.