Effects of Crop Season, Storage Conditions, Cultivars, and Fungicide on Postharvest Mold Fungi Infecting Sorghum Grain

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Bandyopadhyay, R.
Hall, A. J.
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Navi, Shrishail
Research Scientist III
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Plant Pathology and Microbiology
The Department of Plant Pathology and Microbiology and the Department of Entomology officially merged as of September 1, 2022. The new department is known as the Department of Plant Pathology, Entomology, and Microbiology (PPEM). The overall mission of the Department is to benefit society through research, teaching, and extension activities that improve pest management and prevent disease. Collectively, the Department consists of about 100 faculty, staff, and students who are engaged in research, teaching, and extension activities that are central to the mission of the College of Agriculture and Life Sciences. The Department possesses state-of-the-art research and teaching facilities in the Advanced Research and Teaching Building and in Science II. In addition, research and extension activities are performed off-campus at the Field Extension Education Laboratory, the Horticulture Station, the Agriculture Engineering/Agronomy Farm, and several Research and Demonstration Farms located around the state. Furthermore, the Department houses the Plant and Insect Diagnostic Clinic, the Iowa Soybean Research Center, the Insect Zoo, and BugGuide. Several USDA-ARS scientists are also affiliated with the Department.
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The frequency of fungal infection of sorghum grain samples taken from 5 storage systems (gunny bags, mud-lined baskets (MB), polypropylene bags (PB), an MB/PB mix and open storage in the corner of a room), involving 26 different varieties, hybrids or local cultivars, 2 seasons (1996 rainy and 1996/97 post-rainy) and 4 fungicide treatments (surface sterilization with 1% sodium hypochlorite plus benomyl treatment, sodium hypochlorite or benomyl alone, and an untreated control) was recorded from rural areas of India (Andhra Pradesh, Karnataka and Maharashtra) in 1997. The major fungi recorded in the samples were Alternaria alternata, Aspergillus flavus, Aspergillus niger, Bipolaris australiensis [Cochliobolus australiensis], Curvularia lunata [Cochliobolus lunatus], C. lunata var. aeria, Fusarium moniliforme [Gibberella fujikuroi], Lisea fujikuroi [Gibberella fujikuroi], Penicillium citrinum, Phoma sorghina and Rhizopus stolonifer. Full results are tabulated. Grain germination was better in samples collected after the rainy season and from grain stored in gunny bags and mud-lined baskets. Local cultivars tended to germinate better than hybrids and have lower fungal infection. Grains surface-sterilized with 1% sodium hypochlorite and treated with benomyl (0.05%) had the highest germination (81%), but sterilization did not eliminate all fungal contamination. It is suggested that grain be stored in gunny bags or jute bags to minimize damage from Fusarium spp. and that mold tolerant/resistant genotypes are grown during the rainy season.


This article is published as Navi, S S and Bandyopadhyay, R and Hall, A J (2002) Effects of crop season, storage conditions, cultivars and fungicide on postharvest mold fungi infecting sorghum grain. International Sorghum and Millets Newsletter, 43. pp. 65-68. Posted with permission.

Tue Jan 01 00:00:00 UTC 2002