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Journal of Integrative Agriculture  2019, Vol. 18 Issue (9): 2063-2071    DOI: 10.1016/S2095-3119(19)62603-1
Special Issue: 植物细菌真菌合辑Plant Bacteria/Fungus
Plant Protection Advanced Online Publication | Current Issue | Archive | Adv Search |
Combined application of Trichoderma harzianum SH2303 and difenoconazole-propiconazolein controlling Southern corn leaf blight disease caused by Cochliobolus heterostrophus in maize
WANG Shao-qing1, 2, 3*, MA Jia4*, WANG Meng1, 2, 3, WANG Xin-hua1, 2, 3, LI Ya-qian1, 2, 3, CHEN Jie1, 2, 3  
1 School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, P.R.China
2 Key Laboratory of Urban Agriculture (South) Ministry of Agriculture, Shanghai Jiao Tong University, Shanghai 200240, P.R.China
3 State Key Laboratory of Microbial Metabolism, Shanghai Jiao Tong University, Shanghai 200240, P.R.China
4 Plant Genetic Engineering Center of Hebei Province, Institute of Genetics and Physiology, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang 050051, P.R.China
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Abstract  
Southern corn leaf blight (SCLB) disease caused by Cochliobolus heterostrophus is one of the major threats to corn production worldwide.  The synergistic application of low toxic chemical fungicide and biocontrol agents could improve biocontrol stability and efficiency against plant diseases, which ultimately reduce use of chemical fungicide.  Trichoderma spp., well-known biocontrol fungi have been used to control some foliar diseases.  However, few works have been reported on synergistic application of chemical fungicide and Trichoderma against foliar diseases.  This study was aimed to investigate the control effect on the synergistic application of Trichoderma harzianum SH2303 and difenoconazole-propiconazole (DP) against SCLB.  Results showed that the synergistic application of DP and SH2303 reduced the leaf spot area compared to the control.  The efficacy of synergistic application of DP+SH2303 against SCLB could last for 15–20 d in pot trial under the greenhouse condition.  Under the natural field condition, maize treated with DP+DP and DP+SH2303 showed 60% control, which was higher than that of SH2303+DP (45%) and SH2303+SH2303 (35%).  All these treatments induced the synthesis of defense-related enzymes (phenylalanine ammonia lyase (PAL), catalase (CAT), and superoxide dismutase (SOD)) and the defence-related gene expression of SA pathway (PR1).  Taken together the in-vitro leaf test and field trial, the control of SCLB by synergistic application of DP+SH2303 was similar to that of DP+DP.  Among synergistic application, the sequential application of DP+SH2303 showed better control than the sequential application of SH2303+DP.  It was concluded that the synergistic application of chemical fungicide (DP) and biocontrol agent (T. harzianum SH2303) could be used to reduce the chemical fungicide and to reduce the SCLB diseases in maize, which provided alternative approach to realize an eco-friendly controlling of the foliar disease.
Keywords:  synergistic bio-control        chemical fungicide        Trichoderma harzianum        maize leaf spot disease  
Received: 12 September 2018   Accepted: 31 August 2019
Fund: This work was supported by the National Key Research and Development Program of China (2017YFD0201108, 2017YFD0200901), the National Natural Science Foundation of China (31672072, 31872015, 31750110455), the earmarked fund for China Agriculture Research System (CARS-02), the Key National R&D Programs of China - Key International Intergovernmental Scientific and Technological Innovation Cooperation Projects (2017YFE0104900) and the Agriculture Research System of Shanghai, China (201710).
Corresponding Authors:  Correspondence CHEN Jie, Tel: +86-21-34206141, E-mail: jiechen59@sjtu.edu.cn    
About author:  WANG Shao-qing, E-mail: w1214900346@163.com; MA Jia, E-mail: mjxingkong@126.com; * These authors contributed equally to this study.

Cite this article: 

WANG Shao-qing, MA Jia, WANG Meng, WANG Xin-hua, LI Ya-qian, CHEN Jie . 2019. Combined application of Trichoderma harzianum SH2303 and difenoconazole-propiconazolein controlling Southern corn leaf blight disease caused by Cochliobolus heterostrophus in maize. Journal of Integrative Agriculture, 18(9): 2063-2071.

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