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The paper reports results of investigations concerning the influence of saponin extract of quillaja on the food choice and development of Colorado potato beetle. Choice tests with the use of potato leaf discs treated and untreated with tested saponins’ extract were made. The influence of the presence of saponins on the food choice and intensity of insect feeding were observed. It was stated that saponins significantly restrain feeding and disturb development of this pest
Secondary plant substances - glucosinolates and saponins reduced seed germination and seedling growth of lettuce. Saponins showed greater inhibitory effect on both germination and growth of lettuce seedlings than glucosinolates. The effect depended on the concentration of these compounds in the ground. Tested compounds caused abbreviation of roots, browning their tips and prevented root hair development.
Biological activity of secondary plant substances: glucosinolates, alkaloids and saponins in relation to Colorado potato beetle, Leptinotarsa decemlineata was studied in detail. Larvae and adult insects were reared on potato leaves sprayed with tested compounds applied in three different concentrations. The insect behaviour, mortality and weight changes were observed. Among examined chemicals saponins proved to be the most active against Colorado potato beetle. They showed antifeedant properties and caused high larval mortality.
The influence of secondary plant substances - glucosinolates, alkaloids and saponins on the food choice by Colorado potato beetle (Leptinotarsa decemlineata Say) was investigated. Choice and no-choice assay with potato (Solanum tuberosum L.) leaf discs were made. lnsects' feeding was decreased on leaf discs treated with tested substances and it depended on the concentration of used compounds. Saponins were the most active as antifeedants against Colorado potato beetle.
The content and composition of glucosinolates in green parts of mustard plant (Sinapis alba L.), at different stages of plant development were analysed. Four mustard varieties: Salvo, Metex, Ascot and Nakielska were taken under consideration. lt was stated that in green parts of mustard sinalbin was dominating component of glucosinolates, but also glucotropeolin and small amounts of glucobrassicanapin apeared. The content of these compounds changes during vegetation and it is different in particular plant organs. Biological activity of mustard glucosinolates towards cabbage aphid was also studied. The correlation between the content of glucosinolates in plant and its susceptibility to aphid (Brevicoryne brassicae L.) infestation was checked. lt was found that higher level of glucosinolates in plant caused some limitation of this pest development. Also the activity of water and alcohol extracts from mustard leaves was tested in relation to cabbage aphid. Disadvantageous influence of these extracts on aphids’ survival was observed and this effect depended on extract’s concentration.
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