Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Seasonal availability of Phaeocryptopus gaeumannii ascospores and conditions that influence their release.

Abstract

Ascospores were released from pseudothecia on moistened Pseudotsuga menziesii needles in Apr.-Sept., with max. numbers during June and July. Pseudothecia on 1-yr-old needles released 10 times more ascospores than did those on 2-yr-old needles. Moistened pseudothecia released 75% of available ascospores within 20 min and all within 4 h. Ascospores were released at 5-30°C, max. at 20°. Compared with darkness, UV or fluorescent light sources enhanced ascospore release.