Insecticidal effects of eudesmanes from Pluchea sagittalis (Asteraceae) on Spodoptera frugiperda and Ceratitis capitata

Insecticidal effects of eudesmanes from Pluchea sagittalis (Asteraceae) on Spodoptera frugiperda and Ceratitis capitata



A. Sosa, M. Costa, A. Salvatore, A. Bardon, S. Borkosky, N. Vera



Eudesmanoids play an important role in the protection
of plants against herbivores. Pluchea sagittalis (Lamarck) Cabrera
(Asteraceae) is widespread in tropical South America and contains
compounds that provide protection against phytophagous insects. In the
present work we isolated seven sesquiterpenoids with eudesmane skeletons
that were evaluated for their insecticidal activities against
Spodoptera frugiperda and Ceratitis capitata, pests that cause serious
damage to crops in the Argentine northwest. The Eudesmanes were
incorporated at different concentrations to the diet of Spodoptera
frugiperda. In the choice test, larval feeding behavior was altered. The
eudesmanes 1, 5 and 7 showed the highest activity with feeding election
indexes (FEI) of 50, 50, and 72 %, respectively at 200 µg/g of diet.
When tested for insecticidal activity using neonate larvae with the
no-choice artificial diet bioassays, eudesmane 1 was the most toxic in
the larval stage (LD50 177.80 mg/g of diet). Compounds 5 lowered the
percentage of adult emergence and produced the most malformations (72%)
compared with control. Drastic effects were observed in the oviposition
deterrence activity against C. capitata. The maximum oviposition
deterrence (87 %) was recorded with eudesmane 5 at dose 30 µg/cm2 of
artificial fruit. Finally, eudesmanes 6 and 7 showed significant larval
and pupal mortality against the first generation larvae of viable eggs
oviposited by females fed with the treated diet (100 µg / g artificial
diet). 



10.22161/ijeab/2.1.45



http://ijeab.com/upload_document/issue_files/45%20IJEAB-JAN-2017-60-Insecticidal%20effects%20of%20eudesmanes%20from%20Pluchea%20sagittalis.pdf



ijeab.com/submit-paper/

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