Abstract:
Purpose : Anthracnose disease caused by Colletotrichum coccodes is a significant postharvest disease in
tomatoes. Although there are negative impacts of fungicides usage on fresh produce, at present, it is the most
common method of eliminating diseases. UV-C hormesis was used in this study as a trending non-chemical
postharvest treatment.
Research Method : Tomato varieties ‘Thilina’ and ‘Roma’ were used to check the efficacy of UV-C treatments. Five
different UV-C dosages (0, 1, 2, 3, 4, 5 kJ/m2
) were applied to pure cultures of C. coccodes (254 nm at a distance of 15
cm). The selected dosages (3.0 and 4.0 kJ/m2
) were tested on the effect of anthracnose disease development in vivo and
the change in postharvest quality parameters (weight loss, firmness, shelf life, antioxidant and total phenolic content).
Antifungal activity of the peel was investigated using Cladosporium bioassay.
Findings : Weight loss of treated ‘Thilina’ variety has significantly increased (P < 0.05). The antioxidant
activity and the total phenolic content of both treated varieties have increased. The firmness has significantly
retained in treated ‘Thilina’ variety. Further, the shelf life has significantly extended in both treated varieties
by approx. 2 folds compared to the non-treated control. All tested tomato samples indicated the presence of
antifungal compounds in their peels. Therefore, to suppress anthracnose disease 4.0 kJ/m2
, and 3.0 and 4.0
kJ/m2
are the most suitable UV-C dosage for ‘Thilina’ and ‘Roma’ respectively.
Research Limitations : This research is based on the available tomato cultivars in the market.
Originality / Value : This is a non-chemical treatment which could be utilized by farmers in future, to control
postharvest anthracnose in tomatoes.
