ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Antifungal potential of raw plant extracts to reduce anthracnose disease of papaya

Hernandez A.R.; Barrera N.L.L. and Bautista B.S.

5th International Postharvest Symposium . Volume of Abstract . Verona, Italy 6-11 June 2004, p.108

2004

บทคัดย่อ

Use of raw plant extracts with antifungal activity might be an alternative for the control of postharvest diseases because they are biodegradable and not very toxic. In this research, the fungicidal effect of 40 raw extracts from various plant especies was evaluated o­n the germination of spores of two strains of Colletotrichum gloeosporioides isolated from papaya (Carica papaya L.) fruit obtained from two different states of Mexico (Veracruz and Guerrero). Similarly, those extracts presenting fungicidal effects o­n in vitro studies were later evaluated o­n in situ.

Results showed that after 14 or 18 h incubation, spores of the two different strains treated with night-blooming Jessamine (Cestrum nocturnum) and cherimola (Annona cherimola) extracts had the highest spore germination percentage inhibition (95%). The activity of C. noctrunum might be related to the presence of flavonol and phenolic glucosides and a steroidal saponin already reported in leaves. For a A. cherimola, isolations of alkaloids and flavonoids have been reported as well. With the remainder 38 extracts, spore germination inhibition, following the two incubation periods to both strains was lower than 65%. For in situ experiments, o­nly extracts of C. nocturnum and A. cherimola were tested o­n papaya fruit. Compared to the control and thiabendazol treatments, o­n significant differences were observed in percentage infection and disease severity when extracts were applied. In general, similar fruit quality i.e. total solubles was recorded in fruit for all treatments, although percentage weight loss was lower in fruit treated with cherimola extracts.