Control Efficacy of Mixing Application of Microbial and Chemical fungicide against Phytophthora blight of red-pepper

This study was conducted to reduce the using amount of chemical fungicides for the control of red-pepper Phytophthora blight. Effect of combination application of two microbial fungicides and two chemical fungicides for the control of red-pepper Phytophthora blight was examined in vitro, in greenhouse and under field conditions. Each microbial fungicides and chemical fungicides was two-fold diluted and mixed-soil drenched. In the greenhouse pot assay, the mixed application of B. pumilus QST2808 and a mixture of dimethomorph + ethaboxam (De) among four mixed applications of two microbial fungicides (B. pumilus QST2808, P. polymyxa AC-1) and two chemical fungicides showed the highest control effect against Phytophthora blight. Also, control effect of mixed application of B. pumilus QST2808 and De was similar to that of single application of De (dimethomorph + ethaboxam) or Mo (mancozeb + oxadixyl). In the field test, when the microbial fungicides (B. pumilus QST2808, P. polymyxa AC-1) and the chemical fungicide(De) for the control of Phytophthora blight of red pepper were mixed-soil drenched four times at 7~10 day-intervals, the control values were in the range of 78.8% to 82.0%. On the other hand when each of the two chemical fungicides (De, Mo) were soil drenched four times at 7~10 day-intervals, the control value were 65.7% to 85.8%. Consequently, the mixed application of the microbial fungicides and chemical fungicides could be recommended as a control method for reducing the using amount of chemical fungicides.

[1]  Li-jing Zhang,et al.  Selection of Biocontrol Agents against Phytophthora Blight of Pepper and Its Root Colonization Ability , 2010 .

[2]  Tae-Ryong Kwon,et al.  Resistance to Phytophthora Blight of Commercial Pepper Cultivars in Korea , 2010 .

[3]  Xiang-guo Li,et al.  Development of a System for Controlling Ginseng Alternaria Leaf Blight (Alternaria panax) to Reduce Fungicide Application and Use , 2009 .

[4]  Xiang-guo Li,et al.  Control of Alternaria Leaf Blight of Ginseng by Microbial Agent and Fungicides , 2008 .

[5]  Jae-Ho Lee,et al.  Development of Antagonistic Microorganism for Biological Control of Pythium Blight of Turfgrass , 2006 .

[6]  장경수,et al.  In Vitro antifungal activities of 13 fungicides against pepper anthracnose fungi , 2006 .

[7]  D. Fravel,et al.  Compatibility of the biocontrol fungus Fusarium oxysporum strain CS-20 with selected fungicides , 2005 .

[8]  Choong-hoe Kim.  Review of Disease Incidence of Major Crops in 2003 , 2004 .

[9]  A. Keinath,et al.  Evaluation of fungicides for prevention and management of powdery mildew on watermelon , 2004 .

[10]  M. Shoda,et al.  Integrated biological and chemical control of damping-off caused by Rhizoctonia solani using Bacillus subtilis RB14-C and flutolanil. , 2001, Journal of bioscience and bioengineering.

[11]  B. Duffy.  Combination of pencycuron and Pseudomonas fluorescens strain 2-79 for integrated control of rhizoctonia root rot and take-all of spring wheat , 2000 .

[12]  D. S. Kenney,et al.  Kodiak®—a successful biological-control product for suppression of soil-borne plant pathogens of cotton , 1997, Journal of Industrial Microbiology and Biotechnology.

[13]  L. Korsten,et al.  Field Sprays of Bacillus subtilis and Fungicides for Control of Preharvest Fruit Diseases of Avocado in South Africa. , 1997, Plant disease.

[14]  Y. Elad,et al.  Use of Trichoderma harzianum in combination or alternation with fungicides to control cucumber grey mould (Botrytis cinerea) under commercial greenhouse conditions , 1993 .