In comparison with other cruciferous vegetables, horseradish has rarely been the object of scientifi c research, and the knowledge about the composition, content and distribution of glucosinolates (GLS) in different organs of horseradish plants is limited. Therefore, the aim of this study was to evaluate changes in the GLS content in leaves and roots of four horseradish landraces during the growing season.The presence of 13 GLS was determined in the examined horseradish tissues, and glucoraphanin, glucoraphenin and napoleiferin were noted for the fi rst time in the species. During the growing season, the content of individual GLS changed signifi cantly. The rate and direction of these changes varied across the examined landraces and plant organs. In the leaves, between May and June, the content of sinigrin, the main GLS in all horseradish landraces, decreased in Bavarian (40%) and Hungarian (11%) horseradish, increased (22%) in Creamy horseradish, whereas in Danish horseradish, the difference was not signifi cant. Despite the changes observed in the fi rst two months, the highest content of sinigrin was noted in July in all horseradish landraces. During the growing season (August-October), the content of sinigrin fl uctuated in the roots of Creamy and Danish landraces, reaching the highest level in October and September, respectively, whereas in the roots of Hungarian and Bavarian landraces, sinigrin concentrations continued to increase and peaked in October. Changes in the content of other, minor GLS during the growing season often differed from those noted in sinigrin levels.

Phytophagous Entomofauna of Tomato, Paprika and Eggplant Occurring on Plantations in Poland in 1919-2010 In Poland, in the years 1919-2010, in field crops of tomato (Lycopersicon esculentum Mill.), paprika (Capsicum annuum L.) and eggplant (Solanum melongena L.) there were found 52 phytophagous species belonging to 6 orders of insects: Orthoptera, Thysanoptera, Hemiptera, Coleoptera, Lepidoptera and Diptera. The number of pest species occurring on the different crops was: tomato - 39, paprika - 41, eggplant - 27. The presented phytophagous entomofauna proved to be stable in terms of species composition over the years of observations. However, there was a significant variation in population size, which was subject to considerable fluctuations in successive growing seasons. The dominant species posing a threat to plantations every year included: for tomato: Colorado potato beetle (Leptinotarsa decemlineata), green peach aphid (Myzus persicae), soil pests: cutworm (Agrotis sp), wireworms (Agriotes sp) and white grubs (Melolontha sp); for paprika: onion thrips (Thrips tabaci), green peach aphid (Myzus persicae), bugs (Lygus sp.); for eggplant: green peach aphid (Myzus persicae), Colorado beetle (Leptinotarsa decemlineatas), onion thrips (Thrips tabaci).

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