Effect of non-chemical and chemical protection on healthiness and yielding of horseradish

摘要

Applied protection methods modified the yield, the structure of horse radish root fraction and leaf infection by Albugo Candida, Alternaria spp. and Pyrenopeziza brassicae. In comparison with biological protection, chemical protection gave better yield forming effects. The value of the total yield of horse radish roots per hectare was on average higher by 1.23 t and the marketable yield by 1.24 t. Among the observed fungal diseases, blackleg (Phoma lingam) was the most intensified on horse radish leaves. Its average occurrence was 67.8% of plants at an average infection rate on the level of 5.6. During all vegetation seasons chemical protection proved to be more efficient in limiting horse radish leaves infection by Alternaria spp. and A. Candida, whereas biological preparations produced a better effect in light leaf spot control.