The toxicity and bioactivity of climbing wedelia powder and essential oil against maize weevil

Mongkol Wongsawas, . and Darika Bunphan, . and Phirayot Khaengkhan, . and Ruchuon Wanna, . and Waranyoo Kaewduangta, . The toxicity and bioactivity of climbing wedelia powder and essential oil against maize weevil. pp. 106-114. ISSN 2672-7226

Many types of powders and essential oils derived from plants are used as traditional protection for stored products against insect pests. They are relatively non-toxic to mammals and they meet the criteria for reduced risk pesticides. The toxicity and bioactivity of the powder and essential oil of the climbing wedelia Wedelia trilobata (L.) A.S. Hitchcock were determined against maize weevil Sitophilus zeamais Motschulsky. The powder and essential oil were obtained from the aerial parts of W. trilobata and tested for their toxicity as well as insecticidal and residual activities against S. zeamais. The LC�� value of the W. trilobata powder to S. zeamais was 582.86 g/kg grain within 72 hours while the essential oil was 1 146.19 L/L air within 24 hours. Mixing powder with grain at a dosage of 80 g/kg grain killed S. zeamais at 7.50 after 12 days of exposure and reduced the progeny of S. zeamais by 89.96. After fumigation concentrations of 150 200 and 250 L/L air of W. trilobata essential oil showed 2.50 5.00 and 12.50 of adult mortalities in S. zeamais after 24 hours of exposure with 81.97 83.07 and 97.65 reductions in progeny respectively. The W. trilobata powder and essential oil showed efficacy in the protection against the newly emerged progeny of S. zeamais (80). The W. trilobata essential oil exhibited moderate to strong residual activities. The results suggest that the powder and essential oil of W. trilobata may be effectively used in the management of S. zeamais populations in grain storage.

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Abstract

Many types of powders and essential oils derived from plants are used as traditional protection for stored products against insect pests. They are relatively non-toxic to mammals and they meet the criteria for reduced risk pesticides. The toxicity and bioactivity of the powder and essential oil of the climbing wedelia Wedelia trilobata (L.) A.S. Hitchcock were determined against maize weevil Sitophilus zeamais Motschulsky. The powder and essential oil were obtained from the aerial parts of W. trilobata and tested for their toxicity as well as insecticidal and residual activities against S. zeamais. The LC�� value of the W. trilobata powder to S. zeamais was 582.86 g/kg grain within 72 hours while the essential oil was 1 146.19 L/L air within 24 hours. Mixing powder with grain at a dosage of 80 g/kg grain killed S. zeamais at 7.50 after 12 days of exposure and reduced the progeny of S. zeamais by 89.96. After fumigation concentrations of 150 200 and 250 L/L air of W. trilobata essential oil showed 2.50 5.00 and 12.50 of adult mortalities in S. zeamais after 24 hours of exposure with 81.97 83.07 and 97.65 reductions in progeny respectively. The W. trilobata powder and essential oil showed efficacy in the protection against the newly emerged progeny of S. zeamais (80). The W. trilobata essential oil exhibited moderate to strong residual activities. The results suggest that the powder and essential oil of W. trilobata may be effectively used in the management of S. zeamais populations in grain storage.

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Item Type:	Article
AGROVOC Term:	Essential oil plants
AGROVOC Term:	Powders
AGROVOC Term:	Rice weevil
AGROVOC Term:	Sitophilus zeamais
AGROVOC Term:	Insect pests
AGROVOC Term:	Toxicity
AGROVOC Term:	Plant products
AGROVOC Term:	Insecticidal properties
AGROVOC Term:	Residual effects
AGROVOC Term:	Product protection (stored)
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:55
URI:	http://webagris.upm.edu.my/id/eprint/9631

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