Effect of a number of plant extracts in the life of beetle Tribolium casteneum (Herbst) and flour Trogoderma granarium (Everts).

The effects of six aqueous plant extracts ( Capparis spinosa L.,leaves; Olea europea L., leaves; Dianthus chinensis, flowers; Menthalongifolia L., leaves and Melia azedarach, leaves and ripe fruits) werestudied on a number of biological aspects of Rusty flour beetle Triboliumcasteneum (Herbst.) & Khapra beetle Trogoderma granarium (Everts) .Seven concentrations(%0.5 d.O d.5 ,2.5 ,5 ,7.5 dO)were used for each extract. Different effects on the larval longevityhave been seen when using different extracts, concentrations and insectsspecies .This study revealed that the extracts have significant affects onthe number of larval instars. Some of them increased the number ofmoulting significantly as compared with that of control, moultinginhibition factor, therefore, appeared negative in khapra beetle larvaeTrogoderma granarium; whereas it was positive in most larval stages ofrusty flour beetle Tribolium casteneum.Larvae of rusty-red flour beetle failed to change to pupae stages, thusit remained under the exuvia and died. Also, khapra beetle larvae treatedwith (M azedarach) leaves and fruits extracts could not change to pupae.Development duration was extended in most khapra beetle treatments dueto the increasing of the larval longevity. Treating khapra beetle larvaewith plant extracts increased the weight of pupae as compared to controls.Sexual ratio was almost 1: 1 in all treatments.