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홍연규,엄재열,김순철,Jong-NaeHyun,Jae-MinCho 한국식물병리학회 2002 Plant Pathology Journal Vol.18 No.2
Effects of temperature and dew period on sporulation of a mycoherbicide, Epicoccosorus nematosporus, on the lesion of its host, Eleocharis kuroguwai were determined. Conidia formation was first observed after 10 days on plants incubated for either 12 or 16 h in a dew chamber at 28oC; 16 h dew period resulted in more conidia formation. As the dew period was decreased to less than 8 h, fewer conidia formed. Conidial production was most abundant at 28oC and produced as much as 3.3´104 conidia per lesion, while 0.1´103 and 2.3´103 conidia per lesion were produced at 16oC and 36oC, respectively. Alternating temperature regimes, i.e., 30/ 15, 30/20, 28/20, and 28/15oC (day/night) were much better than constant temperature, i.e., 30/30, 28/28/, and 20/20oC for sporulation. In the second sporulation, there were as much as 3.1´104 conidia per lesion (ca. <50% of the first sporulation). Then, sporulation dropped sharply to 6.2´102 conidia per lesion in the third sporulation. Results of this study suggest that temperature combined with dew period is the primary limiting factor in the use of E. nematosporus as a mycoherbicide of E. kuroguwai
홍연규,엄재열,이봉춘,이동창,송석보,Jae-MinCho,Jong-NaeHyun 한국식물병리학회 2003 Plant Pathology Journal Vol.19 No.2
The study was conducted to determine the cultural conditions and the effect of inert fillers for melanization and sporulation abilities of sodium alginate pellets, and the weeding efficacy of the formula in the field. Melanin production of E. nematosporus was affected by striking frequency. Percentage of melanized beads was increased to 80.6% at higher rpm up to 180. The melanized pellets produced more conidia with abundant mucilage than unmelanized pellets. Shaker culture of Epicoccosorus nematosporus with sodium alginate yielded a total of 55 mg per 100 pellets. Percentage of melanized pellets was highest, with 81.0% and 83.3% of melanization, when wheat bran and rice polish were amended and produced the conidia with 65.4 and 68.4 mg per 100 pellets, respectively. When 1 L of conidial suspension of 6.0 ´ 105 conidia per ml was applied on 30-day-old plants in a plot, 74.5% of the plants were killed within 20 days, whereas, its melanized sodium alginate pellets killed 57.8% of the plants in the same period. The number of tuber formation of Eleocharis kuroguwai in the untreated control plots was 128.5 per plot, but those of the plots treated with conidial suspension and melanized pellets were 22.1 and 39.7, respectively, at the end of the season. Results of this study showed that melanization of mycelia-mixed sodium alginate are an important sporulation factor in E. namatosporus as a mycoherbicide.
홍연규,김순철,엄재열,Kil-LimRyu,Jong-NaeHyun 한국식물병리학회 2002 Plant Pathology Journal Vol.18 No.3
Epicoccosorus nematosporus was detected in all 22 counties surveyed, but the frequency of occurrence of fingerprint stem blight disease (FSBD) on Eleocharis kuroguwai caused by the fungus varied with fields and regions. The disease occurred more frequently in mountain areas than in plain areas. E. nematosporus was detected in less than 20% of plain areas such as Gimjae and Milyang, whereas, it occurred in 40-60% of mountain areas such as Sangju and Jangsoo. In Milyang, mean temperature in July to August 1993 ranged from 17 to 27oC with 14.3 h of dew period. Meanwhile, in the mountain area such as Sangju, Gyeongbook, temperature ranged from 17 to 24oC with 16.1 h of dew period. Plant mortality was 61% in Milyang and 82% in Sangju. Underground tuber formation was highly suppressed at 16 and 33 tubers per plot in Sangju and Milyang, respectively. In 1992 and 1995, plants infected ranged from 40 to 78% in July to September. This sharply decreased to an average of 15% in 1999.