Jianjun (Jay) Hao

Jianjun HaoAssociate Professor of Plant Pathology
School of Food and Agriculture
174 Hitchner Hall

Degree: Ph.D, University of California, Davis, 2000

Research Topic: Plant disease epidemiology; Disease management using chemical and non-chemical strategies; Biological control; Fungicide resistance; Soil microbial communities and plant health; molecular communications of pathogen-pathogen and pathogen-host.

Overview of Research: Plant diseases have threatened worldwide agricultural production, and the associated economic losses often have been catastrophic. After decades of battles with plant pathogens, we have learned that chemicals are not the ultimate answer for disease control. In fact they have caused even more problems such as environmental pollution, chemical resistance in pathogens, and human health issues. My research interests are to 1) Determine the taxonomy of soilborne pathogen at species subspecies or race levels in order to provide critic information for disease management and variety breeding; 2) Enhance plant health by deciphering and manipulating soil microbial communities in systems such as crop rotation, cover corps, soil amendment, and other cultural practices; 3) Discover and develop biomaterials, including biological control microorganisms and other biologically derived products to manage plant disease; 4) Study the fungicide resistance in major plant pathogens using genetic and biological tools; and 5) Determine the mechanisms and ecological function of cell-cell communication (quorum sensing like activities) among plant pathogen, between pathogen and host, and between pathogen and other microorganisms.

Representative Publications:
Ninh, H. T., Grandy, S., Wickings, K., Snap, S. S., Kirk, W., and Hao, J. 2014. Organic amendment effects on potato productivity and quality are related to soil microbial activity. Plant and Soil 386:223–236.

Zhang, X. Y., Zhou, H. Y., Hu, J., Hao, J. J., Xue, Y. F., Chen, H., Wang, B. G. 2014. First report of Fusarium oxysporum and solani causing dry rot of carrot in China. Plant Disease 98:1273.

Liu, P. F., Wang, H. Q., Zhou, Y. X., Meng, Q. X., Hao, J. J., and Liu, X. L. 2014. Evaluation of fungicides enestroburin and SYP1620 on their inhibitory activities to fungi and oomycetes and systemic transportation in plants. Pesticide Biochemistry and Physiology 112:19-25.

Qu, T. Zhang, J., Meng, Z., Liu, X., Cao, Y., L., J., and Hao, J. J. 2014. Metabolism fungicide 2-allylphenol in Rhizoctonia cerealis. Ecotoxicology and Environmental Safety 102:136-141.

Zhang, Z., Hao, J., Yuan, J., Song, Q., Hyten, D. L., Cregan, P. B., Zhang, G., Gu, C., Li, M. Wang, D. 2014. Phytophthora root rot resistance in soybean E00003. Crop Science 54:492-499.

Hao, J. J. and Subbarao, K. V. 2014. Distribution of lettuce big-vein under three irrigation systems. Plant Disease 98: 206-212.

Meng, Q., Hanson, L. E., Douches, D., and Hao, J. J. 2013. Managing common scab caused by Streptomyces scabies using Bacillus amyloliquefaciens BAC03 and other biomaterials. Biological Control 67:373-379.

Liu, H. W., Luo, L. X., Li, J. Q., Liu, P. F., Chen, X. Y., and Hao, J. J. 2013. Pollen and seed transmission of Cucumber Green Mottle Mosaic Virus in cucumber. Plant Pathology 15:376-383.

Lu, X. H., Jiang, H. H., and Hao, J. J. 2013. First report of Pythium recalcitrans causing carrot cavity spot. Plant Disease 97:991.

Gachango, E., Hanson, L. E., Rojas, A., Hao, J. J., and Kirk, W. W. 2012. Fusarium spp. causing dry rot of seed potato tubers in Michigan and their sensitivity to fungicides. Plant Disease 96:1767-1774.

Meng, Q., Jiang, H. H., Hanson, L. E., and Hao, J. J. 2012. Characterizing a novel strain of Bacillus amyloliquefaciens BAC03 for potential biological control application. Journal of Applied Microbiology 113: 1165-1175.

Jiang, H. H., Meng, Q., Hanson, L. E., and Hao, J. J. 2012. First report of Streptomyces stelliscabiei causing potato common scab in Michigan. Plant Disease 96:904.

Bi, Y., Jiang, H., Hausbeck, M., and Hao, J. 2012. Inhibitory effects of essential oils for controlling Phytophthora capsici. Plant Disease 96:797-803.

Rosenzweig, N., Tiedje, J., Quensen III, J. Meng, Q., and Hao, J. J. 2012. Microbial communities associated with potato common scab suppressive soil determined by pyrosequencing analyses. Plant Disease 96: 718-725.

Meng, Q. Yin, J. F., Rosenzweig, N., Douches, D., and Hao, J. J. 2012. Culture-based assessment of microbial communities in soil suppressive to potato common scab. Plant Disease 96: 712-717.

Lu, X. H., Davis, R. Michael, Livingston, S., Nunez, J. J., Hao, J. J. 2012. Fungicide sensitivity of Pythium species associated with cavity spot of carrot in California and Michigan. Plant Disease 96:384-388.

Hao, J. J., Liu, H., Gonzalez, I. R. D., Lu, X. H., Jones, A. D., and Fulbright, D. 2012. Antimicrobial activity of chestnut extracts for potential use in managing soilborne plant pathogens. Plant Disease 96:354-360.

Zeng, W., Kirk, W., Wang, D., and Hao, J. J. 2012. Field management of Sclerotinia stem rot of soybean using biological control agents. Biological Control 60: 141-147.

Zeng, W., Kirk, W., Wang, D., and Hao, J. J. 2012. Use of Coniothyrium minitans and other microorganisms for reducing Sclerotinia sclerotiorum. Biological Control 60: 225-232.

Lu, X. H., Hausbeck, M. K., Liu, X. L., and Hao, J. J. 2011. Wild type sensitivity and mutation analysis for resistance risk to fluopicolide in Phytophthora capsici. Plant Disease 95: 1535-1541.

Bi, Y., Cui, X., Lu X., Cai, M., Liu, X., and Hao, J. J. 2011. Baseline sensitivity of natural population and resistance of mutants in Phytophthora capsici to zoxamide. Phytopathology 101: 1104-1111.

Meng, Q., Cui, X., Bi, Y., Wang, Q., Liu, X., and Hao, J. 2011. Biological and genetic characterization of Phytophthora capsici mutants resistant to flumorph. Plant Pathology 60:957-966.

Lu, X. H., Zhu, S. S., Bi, Y., Liu, X. L., and Hao, J. J. 2010. Baseline sensitivity and resistance-risk assessment of Phytophthora capsici to iprovalicarb. Phytopathology 100: 1162-1168.

Hao, J. J., Meng, Q. X., Yin, J. F., Kirk, W. W. 2009. Characterization of a new Streptomyces strain, DS3024, that causes potato common scab. Plant Disease 93:1329-1334.

Hao, J. J., Yang, M. E., and Davis, R. M., 2009. Effect of soil inoculum density of Fusarium oxysporum sp vasinfectum race 4 on disease development in cotton. Plant Disease 93:1324-1328.

Gong, S., Hao, J., Xia, Y., Liu, X., and Li, J. 2009. Inhibitory effect of bionic fungicide 2-allylphenol on Botrytis cinerea (Pers. ex Fr.) in vitro. Pest Manag. Sci. 65: 1337-1343.

Davis, R. M., Hao, J. J., Romberg, M. K., Nunez, J. J., and Smith, R. F. 2007. Efficacy of germination stimulants of sclerotia of Sclerotium cepivorum for management of white rot of garlic. Plant Disease 91: 204-208.

Hao, J. J., and Subbarao, K. V. 2006. Dynamics of lettuce drop incidence and Sclerotinia minor inoculum under varied crop rotations. Plant Disease 90: 2 69-278.

Wu, B. M., Subbarao, K. V., Ferrandino, F. J., and Hao, J. J. 2006. Spatial analysis based on variance of moving window averages. Journal of Phytopathology 154: 349-360.

Hao, J. J., and Subbarao, K. V. 2005. Comparative analyses of lettuce drop epidemics caused by Sclerotinia minor and sclerotiorum. Plant Disease 89: 717-725.

Hao, J. J., Subbarao, K. V., Hubbard, J. C., and Koike, S. T. 2003. Effects of broccoli rotation on lettuce drop caused by Sclerotinia minor and on the sclerotial population in soil. Plant Disease 87: 159-166.