Efficacy of microencapsulated repellents based on Psyadia punctulata exudate and daphne essential oils
2001
Skerlavaj, V. | (Agricultural Inst. of Slovenia, Ljubljana (Slovenia)) | Boh, B. (Ljubljana Univ. (Slovenia). Natural Science and Engineering Fac., Chemical Education and Informatics Dept.) | Knez, E. (Aero d.d., Celje (Slovenia)) | Midiwo, J.O. (Nairobi Univ. (Kenya). Chemistry Dept.)
The contribution presents the results of testing the efficacy of microencapsulated repellents, based on Psyadia punctulata leaf exudate, and Daphne repellent. The active compound of Daphne (Dragoco, Austria) is a mixture of more than twenty natural and synthetic volatile compounds, contributing to smell- and taste-based repellent effects against deer. Psiadia punctulata, a plant species from Eastern Africa, is known to be avoided by browsing herbivores, even during severe drought. Its extract, obtained by acetone extraction of a resinous surface leaf exudate, was tested as a taste-based repellent. A modified in situ polymerization method of aminoaldehyde resins with styrene-maleic acid anhydride modifier was used for the microencapsulation. The product was mixed with polyvinyl alcohol and acrylate binders into a suspension formulation. The efficacy of the repellent on roe deer (Capreolus capreolus Linne) in winter was tested with baits, containing one-year-old apple branches, on agricultural surfaces sown with wheat. The damage caused by browsing was evaluated at different time intervals. The results of testing showed that all microencapsulated repellent formulations exhibited a prolonged activity and improved efficacy in comparison with the standard non-encapsulated Daphne repellent.
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