Canadian Forest Service Publications
Growth, sporulation, and conidia discharge of Valdensinia heterodoxa, a foliar pathogen of salal, as influenced by temperature and photoperiod in vitro. 2002. Vogelgsang, S.; Shamoun, S.F. Mycological Research 106(4): 480-490.
Issued by: Pacific Forestry Centre
Catalog ID: 20537
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Four day/night temperature regimes (11 / 6, 14 / 9, 17 / 12, 20 / 15ºC), three photoperiods (0, 12, 24 h d-1), and four continuous temperature regimes (10, 13, 16, 19 º) were evaluated for their effects on growth, sporulation, and conidia discharge of two isolates of Valdensinia heterodoxa, a foliar pathogen of salal (Gaultheria shallon). All temperature regimes supported mycelial growth; however, growth rates were faster at higher temperatures. Sporulation and conidia discharge in both isolates was generally highest at 17 / 12 º (day / night) or 16 º constant compared with other temperature regimes. Photoperiods of 12 and 24 h d-1 resulted in faster growth and significantly greater sporulation and discharge compared with a continuous dark treatment. The study shows that temperature and light conditions have a moderate effect on mycelial growth but are crucial for sporulation of V. heterodoxa. Possible implications for the use of V. heterodoxa as a potential biological control agent for salal are discussed.