The effect of water extracts from Origanum vulgare L.on feeding of Leptinotarsa decemlineata Say
Journal Title: Journal of Research and Applications in Agricultural Engineering (ISSN 1642-686X) - Year 2018, Vol 63, Issue 3
Abstract
The aim of this study was to determine the effect of water extracts from fresh and dry matter of Origanum vulgare L. on feeding both females and males of Leptinotarsa decemlineata Say. Dried extracts were prepared at concentrations of 2%, 5% and 10%, while the fresh plant at concentrations of 10%, 20% to 30%. Beetles feeding intensity assessment was carried out by dipping leaves of potato in respective solutions of the extracts, and then determining the weight of food eaten by beetles twice daily. In addition, absolute deterrence index and palatability index were calculated. The results of the experiment showed that the extracts prepared from dry and fresh matter at the highest concentrations (10 and 30% respectively) contributed to the greatest reduction of the females and males feeding. Similar results were also observed after application of lower concentrations of extracts, however, only in the case of females. The highest concentrations of the extracts analysed hindered feeding of Colorado potato beetle adults mostly, what is demonstrated by the highest values of absolute deterrence index and the lowest values of palatability index in these objects.
Authors and Affiliations
Milena Rusin, Janina Gospodarek
Keywords
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