Microbial control of sweet potato to tuber rot caused by Lasiodiplodia theobromae (Pat.) using Trichoderma
2004
Palomar, M.K. | Paterno, V.G.,Leyte State Univ., Baybay, Leyte (Philippines)
The effect of the fungal antagonist (Trichoderma F17c) to control root rot caused by Lasiodiplodia theobromae (Pat.) was verified through pot and field experiments. Tuber rotting was monitored at harvest and after two months of storage. A highly significant interaction in pot experiment was observed between 60 g Trichoderma F17c inoculum density (applied two and three months after planting) and infection based on percentage infected roots and disease control. There was no interaction between the inoculum level of Lasiodiplodia theobromae and Trichoderma F17c and time of application in the field. However, test of means revealed a significant difference between percent infected roots and percent disease control in both 50 and 100 g inoculum levels of L. theobromae. The higher the inoculum density of L. theobromae, the greater the percent infected roots, thus the lower the percent disease control. Regardless of inoculum densities of Trichoderma F17c (50, 75 and 100 g), root infection was reduced during storage when applied two and three months after planting than when applied during planting to one month. Reduced root infection was noticeable in 100 g followed by 75 and 50 g inoculum densities. Control provided by Trichoderma F17c was even better compared to the effect of Benlate. Benlate (fungicide) treatment was better in terms of net sales after harvest, however, when expenses were equated to the amount of roots left after deducting the percentage infection after storage, the Trichoderma F17c treatment had higher returns compared to Benlate. The results suggest that Trichoderma F17c grown in organic substrate can be used as an alternative to chemical control and effective for the management of postharvest rotting of sweet potato tubers caused by L. theobromae.
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