Browsing by Subject "Fusarium spp."

Fusarium species lower the germination of oat (Avena sativa) seeds and cause losses in yields. Fungicidal seed treatments prevent fungal diseases from spreading through seeds and soil. This study was conducted to determine how different fungicidal seed treatments affect the germination of oat seeds and the Fusarium species present in laboratory conditions applying official ISTA germination test methods on filter paper and sand. Aim was also to detect the damages fungi cause to oat seedlings as well as the effectiveness of different seed treatments and the resistance of oat cultivars to Fusarium. The germination percentages and damages were detected in two studies. In the first study, oat seeds were germinated on both filter paper and sand and treated with fungicidal seed treatments (Baytan Universal, Celest Trio and Zardex G). In the second study, oat seeds were inoculated with Fusarium culmorum and germinated on filter paper. Additionally, the effect of mould fungi on germination in several different geographical areas, years and cultivars was investigated based on the official germination tests conducted by Evira, who used samples analysed for certifying. Differences were detected between cultivars in their germination and damages caused by fungi in different geographical areas and years. In general, there were more damages in the seed lots with lower germination. The fungicidal seed treatments decreased damages clearly but increased germination only slightly. Only slight differences were observed between the researched seed treatments in their abilities to increase the germination of oat but there were greater differences in their abilities to decrease the amount of Fusarium and the damages they caused to oat seeds. The seed treatment with fludioxonil, difenoconazole and tebuconazole as active ingredients was the most effective against the damages caused by Fusarium in laboratory conditions. Additionally, the germination of oat was better with the sand germination method than on filter paper. However, there were more damages on oat seedlings germinated on sand than on filter paper.