Effect of some plant oils against adult (khapra) beetle Trogoderma granarium Everts (Dermestidae: Coleoptera) on wheat seed Triticum aestivum L. in storage

Abstract

The effect of some plant oils Dianthus caryophyllus L. Nigella sativa, Citrullus colocynthis Sch. and Peganum harmala against adult of Trogoderma granarium were tested . The results indicated that the percentage of repellent was reached 100% for both oils (Citrullus colocynths and Peganus harmala). In addition the result showed that the high mortality percentage in the adult when the seeds treated with the plant oil of P. haramala which was reached 87.74% followed by the effect of C. colocynthis 82.73% and the highest effect of oils in F1was P. harmala 43.0% while the reduction average was reached 54.37%. The lowest effect was in Nigella sativa oil 69.8% . The magnitude reduction in F1 was 35.47% . Also, the result showed that using the plant oils has no significant effect on the germination of seeds percentage, so it can be considered these oils as an environmentally safe and cheap be used as alternative to synthetic insecticide for controlling khapra beetle T. granarium in stored wheat.