Laboratory Evaluation of Four Plants Powders Against Some Stored Products Insects

The effect of the leaves of Petrosxlinum sativum, Datura stramonium, the seeds of Thymas syriacus and Pimpinella anisum were mixed with grain wheat at 0.2 and 0.4 % w/w concenration. They were evaluated against adults Tribolium confusum, Trogoderma granarium, Oryzaephilus surinamensis and Rhizopertha dominica.
O. surinamensis was the most susceptible to plant powders. The mean percent mortality was 65.38, 6.93, 1.87 and 0.55 % for O. surinamensis R. dominica, T. granarium and T. confusum respectively. Powders of all plants showed repellent effect to the four insect species except T.spicta L. powder which attracted adult of T. granarium at 27.33 %.
Rearing of T. granarium on wheat grains treated with the plant powders at 0.4 % effect the biology of the insects. The adults gave a progeny of 3.33, 12, 28 and 36.66 individuals from two pairs of insects respectively in comparison to 60 individuals in the control treatment.