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Articles by Louis Kajac Prom
Total Records ( 2 ) for Louis Kajac Prom
  Louis Kajac Prom , Hugo Cuevas , Thomas Isakeit , Ramasamy Perumal and Saradha Erathaimuthu
  Background and Objective: Grain mold is one of the major biotic constraints to sorghum production worldwide. This disease complex is associated with many genera of fungi, including mycotoxigenic Fusarium species. Yield losses can be high, especially when susceptible lines are planted in areas with wet conditions later in the growing season. The aim of this study was to determine the frequency of fungal genera/species contaminating sorghum seeds, grain mold severity, seed weight and germination rate. Materials and Methods: During the 2016 and 2017 growing seasons, 62 sorghum lines were collected from Puerto Rico and Mexico. Panicles from these locations were threshed and the seed samples were put in separate paper bags and stored at 7°C in a refrigerator in the laboratory. Seed samples were evaluated for grain mold severity, seed mycoflora, seed weight and germination rate. Results: In Isabela, Puerto Rico, Fusarium thapsinum was the dominant fungal species isolated from sorghum grain, followed by Aspergillus spp. and F. semitectum in 2016 and 2017, F. semitectum was the most frequently isolated fungal species. In Guayanilla, Puerto Rico and Puerto Vallarta, Mexico, FIESC (Fusarium incarnatum, F. acuminatum, F. equiseti and F. semitectum Complex) were the dominant species isolated from sorghum seed samples. Among the sorghum lines evaluated for grain mold severity, KS-963 collected from Guayanilla, Puerto Rico, exhibited a moderate resistance response to grain mold, while the other sorghum lines were either moderately susceptible or susceptible. Across locations, KS-835 exhibited the highest seed weight (4.7 g) while PI534152 exhibited the lowest seed weight (1.0 g). Germination rates ranged from 100-0% among the sorghum lines surveyed. Conclusion: While F. thapsinum, F. nygamy and C. lunata are considered the most common grain molding species, the frequency of recovery of these three fungal species in some sorghum growing regions, including locations surveyed in this study, may be low. Thus, in grain mold resistance studies, selecting the most dominant fungal species in a sorghum growing region and using them as inocula in either the field or greenhouse is more practical and beneficial.
  Louis Kajac Prom , Haougui Adamou , Adamou Issa , Abdoulaye Abdoulaye Abdoulkadri , Karimou Issa , Ali Outani Bibata and Clint Magill
  Background and Objective: In Niger, sorghum ranks second as the most important cereal after pearl millet and is used primarily as a staple food and fodder. In 2019, an extensive survey of the occurrence and distribution of foliar and panicle diseases affecting sorghum in farmers’ fields from major production regions of Niger was conducted. Materials and Methods: A total of 121 fields in the regions of Tillabéri, Tahoua, Dosso and Maradi along paved and unpaved roads, including National and Secondary (RN1, RN2, RN3) were surveyed. In each field, 60 plants at late flowering to hard dough stages of development were assessed using a W-shaped pattern. Results: The study documented 21 different sorghum diseases, including anthracnose, long smut, oval leaf spot, leaf blight, head smut and zonate leaf spot. The most prevalent diseases were anthracnose, leaf blight, oval leaf spot, rough leaf spot and long smut. The highest mean incidence of anthracnose, leaf blight and rough leaf spot was recorded from Maradi, whereas, the regions of Dosso and Tahoua exhibited the highest mean oval leaf spot incidence. The highest incidence of long smut and zonate leaf spot was recorded in fields in Dosso region. Locations with highest incidence of these diseases can be considered ‘hot spots’ for resistance evaluations. Conclusion: This study is significant because for the 1st time it provides researchers, funding and governmental agencies in Niger a guide on the occurrence, distribution, prevalence and ‘hot spots’ for sorghum diseases.
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