Insecticidal activities of essential oils from different plants against the cabbage worm, crocidolomia pavonana fabricius (Lepidoptera: Crambidae)

Abstract

© 2018, College of Agriculture and Food Science, University of the Philippines Los Banos. All rights reserved. Essential oils from plants play a major role in insect pest management by exhibiting their insecticidal effects in several ways including toxicity, antifeedant activity, repellency and growth regulation. Essential oils from four plant species, namely, lantana, Lantana camara (Linnaeus); oregano, Coleus amboinicus (Loureiro); langkauas, Alpinia pyramidata (Blume); and luyang dilaw, Curcuma longa (Linnaeus) were evaluated for their insecticidal activities against third larval instar of the cabbage worm, Crocidolomia pavonana (Fabricius). Among the four, L. camara was the most toxic to the cabbage worm when applied topically (LD50 = 169.83 µg g-1). A. pyramidata provided the highest toxicity when applied through leaf residue film method (LRFM) (LC50 = 545.18 ppm) and ranked second in topical toxicity (LD50 = 215.90 µg g-1). It also provided the highest antifeedant activity of 51.44% at 1000 ppm. Cu. longa ranked second in providing toxicity of essential oils through LRFM (LC50 = 577.16 ppm) against the cabbage worm and also showed the highest repellency of 30% at 500 ppm. Essential oils from Co. amboinicus showed remarkable insect growth regulatory (IGR) activity expressed in high larval-pupal intermediates and high abnormality among the pupae and adults produced. L. camara also showed remarkable IGR activities of essential oils expressed in the high number of abnormal adults and by providing the shortest adult life span when the larvae were treated.

Source or Periodical Title

Philippine Agricultural Scientist

ISSN

317454

Page

158-166

Document Type

Article

Subject

Alpinia pyramidata, Antifeedant, Botanical insecticide, Cabbage worm, Coleus amboinicus, Crocid olomia pavonana, Curcuma longa, Essential oils, Lantana camara, Repellency, Topical toxicity

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