Antifungal Potential of Crude Plant Extracts on Conidial Germination of Two Isolates of Colletotrichum gloeosporioides (Penz.) Penz. and Sacc.

摘要

Crude plant extracts of leaves and stems of 40 different plant species from the state of Morelos, Mexico, were used to compare conidia germination of two isolates of Colletotrichum gloeosporioides obtained from papaya fruit with anthracnose symptoms,collected from the states of Guerrero and Veracruz, Mexico. In general, better antifungal effect was observed with crude plant extract of night-blooming jessamine (Cestrum nocturnum) and cherimoya (Annona cherimold) for both isolates, after 14 or 18 h incubation, determined by optical microscopy method (OMM) and espectrophotometry method (EM). Conidia of both fungal isolates incubated in crude extracts of Origanum majorana, Carica papaya, Citrus aurantium, Citrus aurantifolia, Bougainvillea spectabilis,Justicia spicigera, Petroselinum sativum, Parthenium hysterophorus, Schinus molle, and Ricinus communis, showed less than 61% germination by OMM and less than 56% by EM. The remaining 28 crude extracts did not show antifungal effect. Conidial germination varied according to extract, isolate, time of incubation, and methodology evaluated.