دراسة التأثير الطارد و القاتل لبعض المستخلصات النباتية في خنفساء الحبوب المنشارية 1758، Oryzaephilus surinamensis Linnaeus (Coleoptera: Silvanidae)‎

Abstract EN

The aim of the present study is testing the efficacy of water extracts of Acacia cyanophylla,Eucalyptus gomphocephala and Nerium oleander leaves to repel and kill larvae and adults of Sawtoothed Grain Beetles Oryzaephilus surinamensis.

The difference in the percentage of dead insects according to the extract and concentrations, exposure time and stage was observed.

The superiority of N.

oleander extract to kill larvae and adults has appeared, followed by E.

gomphocephala leaf extract, and then A.

cyanophylla leaf extract.

High concentrations of the three tested plants extracts achieved highest mortality in the larval stage and adult, and caused a relative increase in the longevity of the fourth instar larvae compared to the control.

The study showed that the larvae of the second and third instar were more responsive to the lethal impact of extracts than the fourth instar larvae and adult insect.