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Insecticidal activity of hypericin towardsManduca sexta larvae

Insecticidal activity of hypericin towardsManduca sexta larvae The toxic effect of hypericin (HYP), a photodynamic quinone that occurs in certain species of the genusHypericum, towardsManduca sexta third-instar larvae was investigated. The LD50 of purified hypericin was 16 μg/g larval initial fresh weight in constant light (22 W/m2). Reduced irradiance resulted in decreased mortality. Sublethal applications retarded larval growth (body fresh weight) in a dose-dependent manner. Toxicity had an absolute light dependence at the dose levels used, the active wavelengths being >500 nm. The phototoxic effect was rapidly lost when larvae were maintained in darkness (>8 hr) prior to irradiation. However, the potential for light-dependent mortality was retained if larvae were starved prior to irradiation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Chemical Ecology Springer Journals

Insecticidal activity of hypericin towardsManduca sexta larvae

Journal of Chemical Ecology , Volume 15 (3) – Jan 5, 2005

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References (23)

Publisher
Springer Journals
Copyright
Copyright
Subject
Life Sciences; Ecology; Biochemistry, general; Entomology; Biological Microscopy; Agriculture
ISSN
0098-0331
eISSN
1573-1561
DOI
10.1007/BF01015181
Publisher site
See Article on Publisher Site

Abstract

The toxic effect of hypericin (HYP), a photodynamic quinone that occurs in certain species of the genusHypericum, towardsManduca sexta third-instar larvae was investigated. The LD50 of purified hypericin was 16 μg/g larval initial fresh weight in constant light (22 W/m2). Reduced irradiance resulted in decreased mortality. Sublethal applications retarded larval growth (body fresh weight) in a dose-dependent manner. Toxicity had an absolute light dependence at the dose levels used, the active wavelengths being >500 nm. The phototoxic effect was rapidly lost when larvae were maintained in darkness (>8 hr) prior to irradiation. However, the potential for light-dependent mortality was retained if larvae were starved prior to irradiation.

Journal

Journal of Chemical EcologySpringer Journals

Published: Jan 5, 2005

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