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Feeding inhibition of Helicoverpa armigera (Hübner) by Eucalyptus camaldulensis and Tylophora indica extracts
Author(s) -
KATHURIA VANIT,
KAUSHIK NUTAN
Publication year - 2005
Publication title -
insect science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 45
eISSN - 1744-7917
pISSN - 1672-9609
DOI - 10.1111/j.1005-295x.2005.00031.x
Subject(s) - eucalyptus camaldulensis , helicoverpa armigera , biology , instar , bioassay , larva , horticulture , botany , pest analysis , eucalyptus , genetics
Crude leaf extracts of Eucalyptus camaldulensis and Tylophora indica were evaluated for their antifeedancy against Helicoverpa armigera larvae in no‐choice bioassays. Cabbage leaf‐disc dipped in different concentrations of leaf extracts was used for feeding fifth instars of H. armigera for 24 hours. Ethanol extracts from both the plant species exhibited significant feeding inhibition activity. The effective concentrations of ethanol extracts that caused 50% reduction in larval feeding (EI 50 ) were 6.9% for E. camaldulensis and 2.8% for T. indica , while these values of hexane extracts were 9.3% and 5.2%, respectively. Compared to the crude leaf extracts, crude alkaloids from T. indica and crude tannins from E. camaldulensis were more potent in reducing larval feedings.