Fusarium infection and mycotoxin contents of oats under different tillage treatments
P. Parikka, V. Hietaniemi, S. Rämö and H. Jalli.
Journal of Plant Pathology Volume 90 (2, Supplement) August 2008, Book of Abstract, 9th International Congress of Plant Pathology, August 24-29, 2008 Torino,Italy,. 507 pages.
2008
บทคัดย่อ
Fusarium infection and mycotoxin contents of oats under different tillage treatments
Fusariuminfection and mycotoxin contents of oat ‘Belinda’, ‘Freja’, ‘Roope’ and ‘Veli’ were studied inFinlandin a field trial in 2004–2006 under autumn ploughing and direct drilling. The infection of developing kernels was investigated from panicle emergence until harvest. Trichotechene mycotoxins were analysed in grain 2-3 weeks before harvest and at harvest. The weather in 2004 was very rainy and cool, in 2005 warm and lessrainy,while in 2006 it was warm and dry.Fusariuminfection was detected immediately after panicle emergence on all cultivars.The first species identified was a T-2/HT-2- producing speciesF. langsethiae, but alsoF. poaewas found in the early stages of kernel development. The deoxynivalenol-producing speciesF. culmorumandF. graminearumcolonized the kernels later. In 2005 and 2006,F. poaewas most abundant in autumn-ploughed plots. Direct drilling increased the infection ofF. avenaceumand reducedF. culmorum. Tillage did not have much effect onF. graminearumandF. sporotrichioidesinfections. However, it increasedF. langsethiaeinfection. Direct drilling decreased DON and NIV contents in grain, but seemed to increase T-2/HT-2 contens of oats. The amounts of DON detected were not high, the highest contents being 790mg/kg on ‘Roope’ in 2006. T-2/HT-2 toxins were detected on all the cultivars, the amounts being highest in ‘Belinda’, 950mg/kg in 2006. The nivalenol contents were high in 2005 due to heavyF. poaeinfection.