Toxicity and repellency activities of the crude methanol extract of Duabanga grandiflora (Lythraceae) against Sitophilus oryzae (Coleoptera: Curculionidae). | [Pakistan Journal of Zoology • 2012]

Author(s):

1. Wanida Auamcharoen: Department of Entomology, Faculty of Agriculture, Kasetsart University, Chatuchak, Bangkok 10900, Thailand

2. Angsumarn Chandrapatya: Department of Entomology, Faculty of Agriculture, Kasetsart University, Chatuchak, Bangkok 10900, Thailand

3. Anake Kijjoa: ICBAS-Instituto de Ciências Biomédicas de Abel Salazar and CIIMAR, Universidade do Porto, 4099-003 Porto, Portugal

4. Yooichi Kainoh: Laboratory of Applied Entomology and Zoology, Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki 305–8572, Japan

Abstract:

Laboratory bioassays were carried out to examine the toxicity and repellency of a crude methanol extract of Duabanga grandiflora against adult rice weevil, Sitophilus oryzae. Toxicity was evaluated using a no choice test with treated filter paper and rice grains while repellency evaluated using a choice test with treated filter paper. The crude methanol extract was found to possess low toxicity against S. oryzae with maximum mortality of 33% at 32 mg/mL (w/v) 7 days after exposure. Toxicity depended on both concentration and duration. The crude methanol extract was also repellent against S. oryzae ranging from 37 and 83% at 5 min to 2 h after exposure and from 60 to 100% at 4 to 24 h after exposure. The exposure period appeared to be the most important factor affecting the repellent effect of crude methanol extract of D. grandiflora (P 0.05).

Page(s): 227-232

DOI: DOI not available

Published: Journal: Pakistan Journal of Zoology, Volume: 44, Issue: 1, Year: 2012

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