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Articles by Sheau-Fang Hwang
Total Records ( 2 ) for Sheau-Fang Hwang
  Kan-Fa Chang , Sheau-Fang Hwang , Heping Wang , George Turnbull and Ronald Howard
  The present research was conducted to characterize possible biocontrol agents and to determine specific etiological factors affecting severity of infection by S. sclerotiorum. Greenhouse studies showed that incubation period, inoculation technique and temperature had significant effects on sclerotinia blight of coneflower. Longer periods of incubation after inoculation usually induced more infection in both Echinacea pallida and E. purpurea, although the former was more susceptible. For E. pallida, E. purpurea and E. angustifolia, seedling wilt and root rot symptoms caused by S. sclerotiorum were most severe when inoculum was placed 1 cm from seedling roots and diminished as the distance increased. Seedling wilt and root rot were more severe in plants grown at 5-15°C than in those grown at 10-25°C. A total of 74 strains of Trichoderma sp. were evaluated for antagonism against S. sclerotiorum in vitro. Strong or very strong antagonism was identified in 36 strains. This antagonism was confirmed for selected strains in greenhouse evaluations. Under field conditions, the efficacy of the Trichoderma treatment surpassed that of the fungicide fludioxonil and a Bacillus sp. biocontrol agent. These results suggest that certain Trichoderma strains have an excellent potential for use in managing sclerotinia blight of coneflower.
  Sheau-Fang Hwang , Heping Wang , Bruce D. Gossen , George D. Turnbull , Ronald J. Howard and Stephen E. Strelkov
  Soil-borne fungal pathogens can reduce stand density in alfalfa (Medicago sativa), birdsfoot trefoil (Lotus corniculatus) and yellow sweetclover (Melilotus officinalis) by reducing seedling establishment and subsequent stand longevity. Fungicide seed treatments containing metalaxyl and fludioxonil were examined in inoculated greenhouse and field tests to determine their efficacy against seedling blight and root rot caused by Fusarium avenaceum and Rhizoctonia solani. Inoculation increased disease severity and reduced establishment, especially in field trials inoculated with Rhizoctonia solani. Under controlled conditions, fludioxonil (alone or in a formulation with metalaxyl) was effective against either pathogen in inoculated trials-seed treatment consistently increased seedling survival and reduced root rot on all three forage species. However, seed treatment had little impact on subsequent forage yield under field conditions. Metalaxyl alone was not efficacious. In fields with high pathogen populations, application of fludioxonil seed treatment on forage legume species could improve seedling establishment substantially.
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