Effect of Periwinkle (Vinca rosea L.), Hargal (Solenostemma argel Del.), Cafure (Eucalyptus camaldulensis Dehn.) and Nimbecidine 0.03 % on the larvae of Khapra beetle (Trogoderma granarium Everts.)

Abstract

This study was conducted in the laboratory of Environment and Natural Resources Research Institute (ENRRI), National Research Center. The study concerned the possibility of usage of aqueous leaves powder extract of periwinkle plant (Vinca rosea), the aqueous powder extract of mixure of (leaves, fruits and stems) of Hargal plant (Solenostemma argel), beside the organic methanol extract of leaves powder of cafure plant (Eucalyptus camaldulensis), in addition to the use of Nimbecidine 0.03% as a commercial product from Neem, which were used as pest control agents under laboratory conditions against the third larval instar of khapra beetle (Trogoderma granarium Everts) feeding on sorghum seeds. The evaluation was based on the mortality, the molting inhibition and anti feeding effect on the development of larvae at 2.5%, 5% and 10% concentrations for each of the different treatments, except for the Nimbecidine 0.03% commercial product which was used as 1.5ml/L 2ml/L and 2.5ml/L concentrations. The highest concentrations (10%) for all botanical extracts gave the highest average of mortality beside Nimbecidine 2.5ml/L concentration. The Eucalyptus 1.28, gave the best mortality followed by the Vinca 0.85, then the Nimbecidine 0.80 and the Hargal 0.67 respectively. Generally, the mortality increased with the increase of concentration. The Nimbecidine gave low average of moulting 1.5 fallowed by Eucalyptus 2.28, then Vinca 2.42 and Hargal 2.71 respectively. Where as the loss of weight of the used seeds in the experiment, were, Hargal 0.837, Vinca 0.879, Nimbecidine 1.098 and Eucalyptus 1.358respectivelly.