Control of tomato seedling damping-off caused by Sclerotium rolfsii Sacc. with ash, microbial antagonist and animal manure [Philippines].
1989
Batsa B.K. | Paderes E.P.
A series of laboratory, greenhouse and field experiments was conducted to determine the effect of ash, Aspergillus niger and animal manure on the mycelial growth, sclerotial body formation, disease development and yield of tomato due to Sclerotium rolfsii, the causal organism of tomato seedling damping-off. In vitro test using modified disc bioassay technique showed that wood ash, A. niger and animal manure from goat, buffalo and chicken significantly reduced the mycelial growth and sclerotial body formation from 98 to 31%. Sclerotial bodies mean diameter was suppressed from 42 to 32%. Pot experiment artificially inoculated with S. rolfsii under greenhouse condition revealed that treatments containing ash, A. niger and animal manure significantly reduced damping-off from 96 to 15%. Chicken manure was comparable to PNCB when applied at 10 g/90 g of soil. Chicken manure treated soil had the lowest viable sclerotia of 4% in contrast to 69.83% viability in PNCB [pentachloronitro-benzene] treated soil. Utilization of ash, animal manure and A. niger in field experiment also gave a highly significant disease reduction from 100 to 61%. Chicken manure applied at 10 t/ha gave a 100% disease suppression. Yield was significantly high in plots treated with chicken manure.
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