Research

The Department maintains well-balanced research programs ranging from fundamental studies of host-parasite physiology to more applied studies of disease control in rice, soybean, cotton, wheat, sorghum, turf, fruits and vegetables. The Department has a strong research history in biological control of diseases and weeds, virology, fungal biology and nematology. The Department also has wide-ranging extension plant pathology programs dedicated to education of growers and the general public about managing plant health using the latest available research and offers numerous graduate level courses in plant pathology for traditional and non-traditional students.

Research Areas

 

 

 

Soybeans:

Current research in Arkansas has focused on the epidemiology and control of various soybean diseases with emphasis on sudden death syndrome (SDS) and stem canker. The SDS research has lead to the identification of the causal agent Fusarium solani. Current research is investigating the effects of rotation, irrigation, soil moisture, and disease development or yield. Work with stem canker involves the effect of timing of infection on disease development, environmental factors influencing disease, cultivar resistance, and use of fungicides for control.

We are also working on a reverse genetics project using viruses as vectors for RNA interference. Our goal is to identify and characterize genes involved in disease development and resistance. In collaboration with breeders in the U of A, we aim to develop techniques that will allow us to identify genes for the improvement of the crop.

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Cotton:

Current research on cotton in Arkansas focuses on the ecology of soilborne plant pathogens. Research directions have concentrated on the influence of soil physical factors and sustainable agricultural practices (winter cover crops and conservation tillage) on soilborne pathogens, including Rhizoctonia solani, Thielaviopsis basicola, and Pythium spp. The importance of chronic disease on seedling development and yield is being investigated.

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Nematology:

Current research in Nematology has focused on the taxonomic and morphologic studies of several phytoparasitic nematodes. Recent research directions have concentrated on the virus-vectoring genera Xiphinema and Longidorus; morphological and molecular studies on the Hoplolaimidae; resistance to the reniform nematode in cotton and soybean; rotation studies of soybean cyst nematode using different resistance reactions of the soybean; and the role of phytoparasitic nematodes in conjunction with other biological entities and cultural practices

Other research conducted at the Southwest Experimental Station (Hope, AR) has focused on the biology and control of plant-parasitic nematodes of agronomic crops with an emphasis on Meloidogyne incognita in cotton and vegetables. Research directions have focused on the quantification of the effects of M. incognita on cotton plant growth, development, and yield and in developing economically feasible root-knot management strategies for cotton and vegetable producers. Research has helped draw attention to the widespread occurrence of M. incognita in Arkansas and has demonstrated the potential for significant crop yield decreases where the nematode occurs. This work along with studies of the effects of crop rotation and genetic resistance for minimizing nematode damage is producing leadership in developing feasible integrated pest management strategies for growers in the mid-South.

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Rice:

Current research on rice focuses on the epidemiology and control of many important rice diseases with an emphasis on sheath blight (Rhizoctonia solani), rice blast (Magnaporthe grisea), kernel smut (Tilletia barclayana), stem rot (Sclerotia oryzae), bacterial panicle blight, false smut and other diseases of the southern U.S. production region.

Sheath blight research has focused on discovery of germplasm with more acceptable levels of resistance; the search for marker genes for sleath blight resistance; the impact of cultural practices, and the economic use of new fungicides.

Current research on rice blast disease has emphasized diversity of the pathogen population; discovery of new resistance genes in diverse rice germplasm used in breeding for the southern U.S.; physiology of flood depth and anaerbiosis of the rhizosphere on resistance in rice; seedborne nature and transmission of rice blase disease; and fungicides.

Research on bacterial panicle blight has centered on screening of germplasm under field conditions for reaction to the pathogen and the development of PCR based detection methods for seed.

Research on stem rot is currently focused on understanding the role of potassium fertilization and soil potassium levels on severity of disease and the effect of preventative fungicide applications in control.

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Vegetable Diseases:

Spinach diseases: http://spinach.uark.edu/

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Fruit Diseases:

Several new diseases have emerged in berry crops in the recent years and our research is focusing on the causal agents and their epidemiology. The ultimate scope of this research is to identify virus vectors and develop sustainable control measures for both vectors and diseases.

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Grain Sorghum:

Current research involves the population dynamics of Colletotrichum sublimeolum (leaf anthracnose of sorghum) in Arkansas and the screening germplasm of Sorghum bicolor for leaf and stalk anthracnose resistance.

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Ornamentals:

Ornamentals is a multi-billion industry around the world. Due to the clonal propagation of several ornamental crops, viruses accumulate and cause significant losses due to the alteration of the phenotype of the plants. Ornamental diseases that persist for several years are rose rosette, Lemoine's Disease of Peony, and redbud ringspot. We are working on the molecular characterization of the causal agents and the development of detection methods that would help to control the diseases and minimize losses in the nursery and ornamental industry.

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