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http://dx.doi.org/10.4489/KJM.2003.31.1.044

Effect of Organic Amendments on Efficacy of Biological Control of Seedling Damping-off of Cucumber with Several Microbial Products  

Lee, Jong-Moon (Department of Crop Science, College of Life and Environment Science, Konkuk University)
Do, Eun-Soo (Department of Oriental Medicine Resource, Chungbu University)
Baik, Su-Bong (Department of Crop Science, College of Life and Environment Science, Konkuk University)
Chun, Se-Chul (Department of Crop Science, College of Life and Environment Science, Konkuk University)
Publication Information
The Korean Journal of Mycology / v.31, no.1, 2003 , pp. 44-49 More about this Journal
Abstract
Several microbial biocontrol products (Greenbiotech Co., Paju, Korea), Green-all T (Trichoderma harzianum), Green-all S(Bacillus sp.) and Green-all G (Streptomyces sp.) were supplemented with organic amendments such as sawdusts and rice hulls to study on efficacy of biological control of seeding damping-off of cucumber caused by Pythium ultimum. Sawdusts amended into potato dextrose agar alone could inhibit in vitro mycelial growth of P. ultimum. All there microbial products of Green-all T, Green-all G and Green-all S significantly reduced seeding damping-off (LSD, P=0.05). However, several amendments such as sawdusts and rice hulls into Green-all T and Green-all S products did not increase efficacy of biological control compared to non-amended treatment. In contrast, supplements of aminodoctor containing several amino acids (Greenbiotech Co., Korea) into Green-all G product significantly increased efficacy of biological control of seeding damping-off, resulting in from 42% to 2% disease incidence in relation to seedling emergence (LSD, P=0.05). Also, amendment of sawdusts into Tricoderma product significantly increased efficacy of biological control as disease index of 5.0 compared to non-amended control of 56.0 in Green-all T product alone. This indicates that organic amendments could increase efficacy of biological control of cucumber seedling damping-off.
Keywords
Bacillus species; Biological control; Organic amendments; Pythium ultimum; Streptomyces species; Trichoderma harzianum;
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