Temperature and seedling age affect susceptibility of perennial ryegrass seedlings to pathogenic fungi |
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Authors: | R. E. Falloon |
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Affiliation: | (1) Plant Disease Division, DSIR, Private Bag, Palmerston North, New Zealand |
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Abstract: | Summary Effects of temperature and seedling age on survival of perennial ryegrass (Lolium perenne L.) seedlings grown on sand-wheat wholemeal cultures of different isolates ofFusarium spp. (9 isolates),Pythium spp. (9 isolates), andChaetomium spp. (1 isolate) are reported. Some isolates were virulent over the whole range of temperatures tested (7.5–27.5°C). The virulence of others depended on temperature. Most isolates were less virulent at intermediate temperatures (12.5–22.5°C) than at higher or lower temperatures. At 25°C ryegrass seedlings were susceptible to fungal attack for only a limited period after germination commenced. This period differed for different fungi, but for most isolates tested, seedlings were resistant after 2–3 days. |
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Keywords: | Fungi Fusarium spp. Lolium perenne Pythium spp. Ryegrass Seedling age Seedling pathogens Temperature |
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