Plant Pathol J > Volume 18(2); 2002 > Article
The Plant Pathology Journal 2002;18(2):81-84.
DOI:    Published online April 30, 2002.
Factors Affecting Sporulation of a Mycoherbicide, Epicoccosorus nematosporus, on the Lesion of Eleocharis kuroguwai
Yeon Kyu Hong, Jong Nae Hyun, Jae Min Cho, Jae Youl Uhm, Soon Chul Kim
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 28℃; 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 28℃ and produced as much as 3.3×10(4) conidia per lesion, while 0.1×10(3) and 2.3×10(3) conidia per lesion were produced at 16× and 36℃, respectively. Alternating temperature regimes, i.e., 30/15, 30/20, 28/20, and 28/15℃ (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 3.1×10(4) conidia per lesion (ca. <50% of the first sporulation). Then, sporulation dropped sharply to 6.2×10(2) 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.
Key Words: conidial production, Eleocharis kuroguwai, Epicoccosorus nematosporus, Lesion, mycoherbicide

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