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The epicuticular waxes of rice, Oryza sativa L. cultivars (Jamini and Santasi) play an important role in host selection and oviposition of the rice bug, Leptocorisa acuta. The GC-MS and GC-FID analyses of the epicuticular waxes indicated the presence of 8 n-alkanes, having chain lengths from n-C14 to n-C32 and 5 free fatty acids (FFAs) having chain lengths from C16:1 to C18:0. Among the identified n-alkanes and FFAs of selected rice cultivars, n-C20 (342.954 ± 9.499 µg plant− 1) and C18:3 (520.960 ± 10.660 µg plant− 1) of Jamini cultivar were the most abundant. For olfactory attraction [female > male] and oviposition [female] the most stimulating synthetic-combined-mixture of the epicuticular wax components was represented by 3 n-alkanes (n-C16, n-C18 and n-C20) and 3 FFAs (C16:1, C18:3, C18:0) in per plant equivalent quantity (565.399 ± 3.463 µg plant− 1 and 963.715 ± 4.341 µg plant− 1, respectively). Moreover, this synthetic-combined-mixture (3 n-alkanes + 3 FFAs), when applied to intact plant of Jamini cultivar, caused stronger behavioural responses (attraction and oviposition) than those observed for other treatments. The host preference (Jamini > Santasi) of L. acuta was evaluated simultaneously by olfactory, visual, and tactile cues, as valid for other insect species. Thus, the combined-synthetic-mixture (3 n-alkanes + 3 FFAs) in plant equivalent quantity (1529.114 ± 5.136 µg plant− 1) of Jamini cultivar acted as the most preferred lure and has the potential to be a part of an alternative sustainable strategy to develop baited trap in integrated pest management (IPM) of L. acuta in the future.
Proceedings of the Zoological Society – Springer Journals
Published: Sep 1, 2022
Keywords: Oryza sativa; Leptocorisa acuta; Cuticular wax; n-alkanes; Free fatty acids; Baited trap
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