Abstract
The in vitro and in vivo antifungal activities of pomelo albedo extract cvs. ‘Khao Tang Gwa’ and ‘Tub Tim Siam’ on the mango anthracnose pathogen Colletotrichum gloeosporioides were studied. Under in vitro condition, ethanol extracts of pomelo albedo suppressed mycelial growth as indicated by mycelial dry weight and inhibited spore germination of C. gloeosporioides. Spore germination was significantly reduced (p < 0.05) in the treatments of ‘Khao Tang Gwa’ (28.77%) and ‘Tub Tim Siam’ (35.65%) ethanol extracts in comparison to the control (77.47%). Results of in vivo study showed that the percentage of disease incidence was not significantly different among the treatments. However, average lesion diameters in ‘Mahajanaka’ mango treated with ‘Tub Tim Siam’ (2.42±0.86 cm) and ‘Khao Tang Gwa’ (2.54±0.64 cm) extracts were slightly smaller than those in the control (2.76±0.63 cm), showing the effect in delaying anthracnose development in artificially inoculated mango. Total phenolic compound of pomelo albodo extracts was 28.73±0.06 and 22.46±0.26 mg GAE/100g dry weight for ‘Khao Tang Gwa’ and ‘Tub Tim Siam’, respectively.
Keywords
Pomelo Albedo tissue Anthracnose Mango Total phenolic compound
