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Introduction
Utsala Shrestha currently works at the Department of Plant Sciences, University of Tennessee. Utsala does research in Plant Protection and Soil Science and Horticulture. Their most recent publication is 'Anaerobic Soil Disinfestation Reduces Germination and Affects Colonization of Sclerotium rolfsii Sclerotia'.
Additional affiliations
September 2016 - present
January 2013 - August 2016
Publications
Publications (28)
Anaerobic soil disinfestation (ASD) is a proven but relatively new strategy to control soil borne pests of horticultural crops through anaerobic decomposition of organic soil amendments. The ASD technique has primarily been used to control soil borne pathogens; however, this technique has also shown potential to control plant parasitic nematodes an...
Growth chamber and field studies were conducted with organic amendment mixtures at C:N ratios 10:1, 20:1, 30:1 and 40:1, and amendment rates 2, 4, 6, and 8 mg C/g soil (C:N ratio 30:1) to evaluate anaerobic soil disinfestation (ASD) effects on germination and colonization of Sclerotium rolfsii. In the growth chamber, sclerotial germination was redu...
Studies on anaerobic soil disinfestation (ASD), a non-chemical alternative to soil fumigants for controlling plant diseases caused by soilborne pathogens, have shown that ASD increases populations of beneficial microorganisms with activity against plant pathogens, including species of Trichoderma and Streptomyces, which are known to parasitize scle...
Anaerobic soil disinfestation (ASD) is a biologically-mediated, pre-plant soil treatment process that relies on the anaerobic decomposition of soil incorporated organic amendments, which leads to formation of pesticidal compounds in soils, including volatile fatty acids, and generally creates an adverse environment for soilborne plant pathogen surv...
Strawberry (Fragaria × ananassa Duch) in Tennessee is cultivated on plastic mulched beds annually, and production is limited primarily by multiple oomycete and fungal root rot pathogens that result in reduced vigor and black root rot disease symptoms. In early June 2018, plants (cv. Chandler) with reduced shoot vigor and size, and black, necrotic s...
Globisporangium sylvaticum (syn. Pythium sylvaticum), is an oomycete that causes root rot and damping off of field crops, ornamentals, and vegetables. Several species in Pythiaceae are associated with black root rot of strawberry [(Fragaria × ananassa) Duchesne] (Millner 2006). Mature, stunted 'Chandler' strawberry plants, with reduced shoot vigor...
Volatile fatty acids (VFAs), such as acetic and n -butyric acid, released during anaerobic decomposition of organic soil amendments during anaerobic soil disinfestation (ASD) likely play a role in soilborne plant pathogen inoculum suppression. However, research is limited on the direct effects of soil VFA exposure on fungal plant pathogen inoculum,...
Volatile fatty acids (VFAs) play a role in suppression of plant pathogens during anaerobic soil disinfestation (ASD), but it is unclear how VFAs in anaerobic soil affect Athelia rolfsii (formerly Sclerotium rolfsii). Anaerobic growth chamber trials were conducted to evaluate effects of VFA and VFA concentration, and interactions with soil pH and so...
Efficacy of anaerobic soil disinfestation (ASD) for soilborne plant pathogen suppression is strongly influenced by soil environment and organic amendment attributes. At the same time, these factors influence soil nutrient availability, crop nutrition, and crop performance, but published information on ASD amendment property effects, including carbo...
A meta-analysis of anaerobic soil disinfestation (ASD) efficacy against Fusarium oxysporum (Fo) and Fo f. sp. lycopersici (Fol) was conducted emphasizing effects of environment and organic amendment characteristics, and pot and field studies conducted on ASD amendment C:N ratio and soil temperature effects on Fol inoculum survival. In a pot study,...
Anaerobic soil disinfestation (ASD) is a cultural technique primarily targeted for control of soilborne plant pathogens, but can also impact weed propagules. A repeated pot study was conducted to evaluate ASD treatment impact on sprouting and growth of introduced Cyperus esculentus (yellow nutsedge) tubers using dry molasses‐based and wheat bran‐ba...
Anaerobic soil disinfestation (ASD), an alternative to chemical fumigation, effectively kills sclerotia of Sclerotium rolfsii. However, its effect on the mycoparasite Trichoderma is not well- documented. We investigated the effect of ASD on Trichoderma population, and sclerotial germination and parasitism. Two mesh bags, each with 10 sclerotia, wer...
Recently, pathogenicity of Fusarium proliferatum was confirmed in legume crops (Arias et al. 2013; Chang et al. 2015); however, to our knowledge there is no record of F. proliferatum pathogenicity in cowpea (Vigna unguiculata (L.) Walp.). In this report, we confirm F. proliferatum as a causal agent of root rot, stem lesions, and abnormal seedling d...
Cowpea (Vigna unguiculata (L.) Walp.), a widely-cultivated grain, vegetable, forage, and cover crop, is an important heat- and drought-tolerant nitrogen-fixing legume for organic and other low-input production systems in subtropical and tropical climates. In July 2014, 4-week-old cowpea plants (cv. Iron & Clay, a mixture of two formerly separate cu...
Anaerobic soil disinfestation is a biologically based, preplant soil treatment that provides an alternative to chemical fumigation for soilborne pest and disease management. The method involves the incorporation of organic amendments that contain a labile carbon source, covering soil with clear or gas-impermeable polyethylene tarp, and irrigating u...
Anaerobic soil disinfestation (ASD; also termed biological soil disinfestation) is a non-chemical process which includes 1) soil incorporation of a labile carbon (C) source, 2) mulching with polyethylene film to limit gas exchange, and 3) drip irrigation to saturation of the topsoil or bedded area. A number of putative mechanisms have been proposed...
Bonnie H. Ownley, Erin N. Rosskopf, Mary E. Dee, David M. Butler
Community participation plays vital role in the development of capacity for the management and utilization of their resources in sustainable way. There are ample success stories for proper management of common property resources through community management. Wetland resources are widely used by the local communities for their sustenance and economi...
A survey was carried out to analyze the potentiality of agritourism in Kirtipur Municipality in 2008. Ninetyfive farmers, 5 from each ward and 8 politicians of Kirtipur were selected randomly along with 20 visitors, 20 hotels and restaurants, 20 travel agency and tour operators, and 20 tourism or agriculture institutions/organizations from Kathmand...