β-Thujone and Its Derivatives Modify the Probing Behavior of the Peach Potato Aphid
2019
Anna Wróblewska-Kurdyk | Radosław Gniłka | Katarzyna Dancewicz | Aleksandra Grudniewska | Czesław Wawrzeńczyk | Beata Gabryś
Thujone is a natural biologically active monoterpene ketone component of essential oils of numerous plants. The aim of the study was to evaluate the effect of &beta:-thujone and &beta:-thujone derivatives bisulfite adduct, lactone, oxime, and lactam application on behavior of Myzus persicae (Sulz.) (Hemiptera: Aphididae) during probing and settling. The choice and no-choice tests (aphid settling and Electrical Penetration Graph (EPG), respectively) revealed that stereochemistry of thujone was important for biological activity (&beta:-thujone caused changes in aphid behavior while &alpha:-thujone did not) and that cyclopentane ring modifications and functional groups addition gave derivatives that possessed stronger and more durable deterrent effects. The most effective modification was the incorporation of a lactam moiety into the &beta:-thujone molecule. Application of &beta:-thujone lactam limited aphid settling for at least 24 h, caused restlessness in aphids and a delay or failure in reaching phloem phase by M. persicae. &beta:-Thujone lactam can be considered a deterrent of medium potency with activity expressed at preingestive phase of aphid probing. Other compounds did not restrain aphid stylet penetration in non-phloem tissues but slightly limited sap ingestion (lactone, oxime), and restrained aphid settling for a period of less than 24 h (&beta:-Thujone, bisulphite adduct, lactone).
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