Larvicidal activities of limonoids from Turraea abyssinica (Meliaceae) on Tuta absoluta (Meyrick)
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Date
2017-12
Authors
Essoung, F. R. E.
Chhabra, S. C.
Mba’ning, B. M.
S. A., Mohamed
Lwande, W.
Lenta, B. N.
Ngouela, S. A.
Tsamo, E.
Hassanali, A.
Journal Title
Journal ISSN
Volume Title
Publisher
Wiley
Abstract
Preliminary screening of extracts of the leaves and stems of four Turraea plant species
(Meliaceae) on second instar larvae of Tuta absoluta (Meyrick) (Lepidoptera:
Gelechiidae) showed that the methanolic extract of Turraea abyssinica leaves possess
good toxic potential with LD50 of 270.7 ppm. Fractionation of this extract led to isolation
of a new limonoid derivative, 12α-diacetoxywalsuranolide
(1) and three other
known limonoids [1α,7α,12α-triacetoxy-
4α-
carbomethoxy-
11β-
hydroxy-
14β,
15β-epoxyhavanensin
(2), 11-epi-
21-
hydroxytoonacilide
(3), 11β,12α-diacetoxycedrelone
(4)]. The structures of the compounds were established by IR, UV, mass spectrometry
and 1D/2D NMR analyses, and in the case of the known compounds, also by comparison
with reported data. All the isolates were tested for their larvicidal activities at
different dose range against second instar larvae of T. absoluta. They were found to be
more active (with LD50 < 7.0 ppm) compared to the reference compound azadirachtin
(LD50 value of 7.8 ppm).
Description
article
Keywords
contact toxicity, limonoids, tomato borer, Turraea species
Citation
Essoung, F. R. E., Chhabra, S. C., Mba'ning, B. M., Mohamed, S. A., Lwande, W., Lenta, B. N., ... & Hassanali, A. (2018). Larvicidal activities of limonoids from Turraea abyssinica (Meliaceae) on Tuta absoluta (Meyrick). Journal of applied entomology, 142(4), 397-405.