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Growth, sporulation, and conidia discharge of Valdensinia heterodoxa a foliar pathogen of salal, as influenced by temperature and photoperiod in vitro

Four day/night temperature regimes (11/6, 14/9, 17/12, 20/15 °C), three photoperiods (0, 12, 24 h d −1 ), and four continuous temperature regimes (10, 13, 16, 19°) 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° (day/night) or 16° 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.