Insecticidal and repellent activities of five plant extracts against stored grain pest Tribolium confusum (Jacquelin du duval), 1868 (Coleoptera: Tenebrionidae)

Abstract

The present research was carried out at the laboratory of plant pathology, Directorate of Diyala Agriculture during 2017 to evaluate the bioactivity of plant extracts Moringa oleifera, Origanum majorana, Artemisia vulgaris, Trigonella foenum and Syzygium aromaticum with three concentrations 10, 20, and 30 % against adults of Tribolium confusum under laboratory conditions. Two bioassays were conducted, the first to evaluate percentage of mortality and second to evaluate repellency percentage. S. aromaticum was recorded higher percentage of mortality 22.2% at 30% concentration after 3 and 4 days, maximum mortality was observed in A. vulgaris 46.6% and 60% at 10% concentration after 7 and 8 days respectively, whereas the average of mortality for plant extracts was higher in A. vulgaris 37.7% followed by S. aromaticum and T. foenum 33.3% with significant differences from control 0% after 8 days. O. majorana was recorded higher average of repellency percentage 46.6% after 10 minute, maximum of repellency percentage was in S. aromaticum 66.6% at concentration10% whereas average of repellency percentage was higher in S. aromaticum 48.8% and M. oleifera 37.7% after 20 minute, while after 30 minute M. oleifera and O. majorana were recorded heights repellency percentage 73.3% and 66.6% at concentration30% respectively and M. oleifera was superior in the average of repellency percentage reached 51.1%.