Insecticidal activity of diosgenin isolated from three species of grape ginger (Costus spp.) on the diamondback moth, Plutella xylostella (L.)
Issue Date
9-2005
Abstract
The unilateral approach of farmers in trying to overcome the diamondback moth (DBM) problem with synthetic insecticides has generated other undesirable effects, which elicited interest in the possible use of botanical insecticides against DBM. The paper reports on the isolation of diosgenin from the rhizome of Costus speciosus, C. lacerus and C. globosus and the bioassay of its insecticidal activity. Diosgenin had a low contact and ovicidal activity but a potent insect growth regulator (IGR) and high oviposition deterrent activity. It caused larval and pupal deformities, reduced fecundity and partial sterility. Based on the ED50 (effective dose that produces 50% abnormal test insects), crude diosgenin was more active than purified diosgenin. The DBM parasitoid, Cotesia plutellae, was 14x less sensitive to diosgenin compared to DBM, therefore, diosgenin is safe to the parasitoid but toxic to DBM.
Source or Periodical Title
Philippine Agricultural Scientist
ISSN
317454
Volume
88
Issue
3
Page
317-327
Document Type
Article
Language
English
Subject
Costus spp., Diamondback moth, Diosgenin, Insect growth regulator, Insecticidal activity, Plutella xyllostella
Recommended Citation
Pipithsangchan, Soontorn & Morallo-Rejesus, B.. (2005). Insecticidal activity of diosgenin isolated from three species of grape ginger (Costus spp.) on the diamondback moth, Plutella xylostella (L.). Philippine Agricultural Scientist. 88(3). 317-327.
Digital Copy
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