Chemical compositions of leaf extracts from Conocarpus erectus L. (Combretaceae) and their bioactivities against Tribolium castaneum Herbst (Coleoptera: Tenebrionidae)

• Published in: Journal of Asia-Pacific entomology Vol. 22; no. 1; pp. 333 - 337
• Main Authors: Rajabpour, Ali, Abdali Mashahdi, Ali Reza, Ghorbani, Mohammad Reza
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-03-2019; 한국응용곤충학회
• Subjects: Botanical insecticide; Buttonwood; Chemical compound; IPM; Stored product pests; 농수해양학; Botanical insecticide; Stored product pests; Chemical compound; IPM; Buttonwood
• ISSN: 1226-8615; 1876-7990
• DOI: 10.1016/j.aspen.2019.01.015

Botanical insecticides have long been considered as alternatives to synthetic chemical insecticides in IPM programs. Effects of aqueous and ethanolic extracts obtained from buttonwood, Conocarpus erectus L. (Combretaceae), leaves on a major kind of stored product pests, Tribolium castaneum Herbst (Coleoptera: Tenebrionidae), were evaluated under laboratory conditions. For this purpose, LC50, repellency, antifeedant properties, and some biological effects (including body weight, immature developmental time and survival) of the insect were determined. The aqueous and ethanolic extracts were highly toxic to the larvae and adults. Calculated LC50 values ranged between 2.6 and 193.4 (g/kg). Both extracts had repellent and antifeedant properties against the adults. The extracts adversely affected the larval and pupal weights, developmental time, and survival. Aqueous extracts were more effective only for the LC50 values and only in females. All other measured parameters do not differ between the two extracts. The bioactive properties might be related to high amounts of alkaloid, phenol and tannin. Aqueous extract of the plant leaves may be a useful alternative for chemical insecticides.
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•Conocarpus erectus extracts had insecticidal activity against Tribolium castaneum.•The extracts were repellent and antifeedant to the pest adults.•The extracts adversely affected biological parameters of the pest.•The properties may be related to high amounts of alkaloids phenols and tannins.