Abstract
Ceratobasidium ramicola is a fitopathogenic fungus that harmful and causes various levels of damage on several types of forestry and horticultural crops. The purpose of this study was to examine the effect of Acacia villosa, Myristica fragrans, Acacia mangium and Calliandra calothyrsus leaf extracts as tannin sources related to the in vitro inhibition of Ceratobasidium ramicola growth. The in vitro inhibition was performed by employing solid potato dextrose agar (PDA) medium to obtain the radial inhibition, while liquid potato dextrose broth (PDB) medium was used to obtain the biomass inhibition. Experimental design was based on in time nested-completely randomized design and statistical analysis was carried out with SAS software version 9.1. The result of radial growth inhibition of Ceratobasidium ramicola showed that tannin extracts of A. mangium and M. Fragrans were not significantly different to each other. Treatment of tannin extracts from A. villosa, M. fragrans, A. mangium and C. Calothyrsus with a concentration of 1% were significantly different with other concentrations and resulted the greatest inhibition values. Tannin extract of A. Mangium at 1% concentration produced the greatest radial inhibition by 33.2%. In most cases, the effective inhibition from tannin extract occurred at the 24h of incubation. The greatest biomass inhibition was produced on 1% tannin extract of A. mangium by 64.3%, while the lowest was produced from 1% tannin extract of M. fragrans by 27.0%.
Highlights
Rhizoctonia sp. fungus is a type of pathogen that causes varying levels of damage to various types of forestry and horticultural plants
Samples of A. villosa leaves were collected from the International Research Institute for Animal Production in Ciawi, while the samples of M. fragrans, A. mangium and C. calothyrsus were collected from Bogor Agricultural University, Dramaga, Bogor
The greatest total phenol was observed in C. calothyrsus, while the greatest total tannin content was found in A. villosa
Summary
Rhizoctonia sp. fungus is a type of pathogen that causes varying levels of damage to various types of forestry and horticultural plants. Fungus is a type of pathogen that causes varying levels of damage to various types of forestry and horticultural plants. Ceratobasidium ramicola causes leaf blight disease on Toona sureni Merr. Various types of damage and vulnerable host to the Ceratobasidium ramicola require an effort to prevent crop production loss. Synthetic fungicide is widely used for uncontrollably pathogen such as soil-borne pathogen. Despite the use of synthetic fungicide is relatively convenient, its excessive use may lead to negative impacts on human health and environment. The second resurgence of pathogen, resistant bodies, as well as the death of the natural enemies that is indirectly disrupt the ecosystem stability may occurs due to continual and excessive use of synthetic fungicide. An effort in improving environmental quality to control plant diseases is through biological control
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