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Bioactivities of the LeafEssential Oil ofCurcuma

Longa (Var. Ch-66) On Three

Species of Stored-Product

Beetles (Coleoptera)

Authors: Tripathi, A. K.; Prajapati,

V.; Verma, N.; Bahl, J. R.; Bansal, R. P.; Khanuja,

S.P.S.; Kumar, S.

Source:Journal of Economic Entomology, Volume

95, Number 1, February 2002 , pp. 183-189(7)

Publisher: Entomological Society of America

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Abstract:

Essential oil extracted from the leaves of turmeric,

Curcuma longa L., was investigated for contact and

fumigant toxicity and its effect on progeny production in

three stored-product beetles, Rhyzopertha dominica F.

(lesser grain borer), Sitophilus oryzae L. (rice weevil), and

Tribolium castaneum Herbst (red flour beetle).

Oviposition-deterrent and ovicidal actions ofC. longa leaf

oil were also evaluated against T. castaneum. The oil was

insecticidal in both contact and fumigant toxicity assays.

The adults ofR. dominica were highly susceptible to

contact action ofC. longa leaf oil, with LD50 value of36.71 g/mg weight of insect, whereas in the fumigant

assay, adults ofS. oryzae were highly susceptible with

LC50

value of 11.36 mg/liter air. Further, in T. castaneum,

the C. longa oil reduced oviposition and egg hatching by

72 and 80%, respectively at the concentration of 5.2

mg/cm2. At the concentration of 40.5 mg/g food, the oil

totally suppressed progeny production of all the three test

insects. Nutritional indices indicate >81% antifeedant

action of the oil against R. dominica, S. oryzae and T.

castaneum at the highest concentration tested.

Keywords:Curcuma; Rhyzopertha; Sitophilus; leaf oil;oviposition-deterrent; antifeedant

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