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United States Department of Agriculture

Agricultural Research Service

Title: Temperature Effect on Sporulation of Botryosphaeria Dothidea, B. Obtusa, and B. Rhodina

item Copes, Warren
item Hendrix, F - UNIV OF GEORGIA

Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: July 1, 2003
Publication Date: June 1, 2004
Citation: Copes, W.E., Hendrix, F.F. 2004. Temperature effect on sporulation of botryosphaeria dothidea, b. obtusa, and b. rhodina. Phytopathology. 93:S17

Technical Abstract: To determine the effect of temperature on sporulation, three Botryosphaeria spp. were grown on autoclaved stems in cotton plugged tubes with constant moisture at 6, 12, 18, 24, and 30 oC. Conidia were counted per pycnidium weekly from 4 to 10 weeks after inoculation. The experiment was repeated 3 times. Maximum sporulation occurred at 24 oC with B. dothidea and at 18 and 24 oC with B. obtusa. Spore production of both fungi showed a quadratic curvilinear response to temperature. Pycnidia were erumpent, typical of their habit in nature. Maximum sporulation of B. rhodina occurred at 12, 24, and 30 oC instead at a distinctive peak. Of the three fungi, B. rhodina produced the greatest number of conidia per pycnidium at all temperatures. Conidial maturation of B. rhodina had a quadratic curvilinear response due to temperature with a maximum maturation at 24 oC. Mycelia and pycnidia of B. rhodina grew on top of the bark atypical of their habit in nature. All three Botryosphaeria spp. produced conidia over the 6 to 30 oC range with a maximum sporulation or spore maturation, which would affect longevity of conidial viability, at 18 to 24 oC.

Last Modified: 3/29/2015
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