Effect of Leaves Powder Aqueous Extract of some trees against Red flour beetle Tribolium castaneum under Store Conditions

Abstract

laboratory experiments were conducted at the Department of Plant Protection, College of Agricultural Studies, Sudan University of Science and Technology. When this study aimed to assess the impact of the water extracts of Mesquite, Prosopis sp, Cafor ,Eucalyptus camaldulensis and Damas, Concarpus lancifolious against thethird larval instar and the adults of the red flour beetle Tribolium castaneum. This study used three concentrations of each plant extract 30%, 20% and 10% plus liquid soap 0.7 and untreated control. For the adult stage the highest concentration of 20% and 30% the Mesquite extract gave mortality of 92% and 96% respectively after 24 hours of treatment. The concentration of 30% of Cafor extract gave mortality of 80% after the same time. While Damas extract gave 52.7%mortality. For larvae the highest concentration of 20% and 30% Mesquite extract gave mortality of 84.7% and 96% after 24 hours of treatment. The concentration of 30% of Cafor extract gave mortality of 70.7% for the same time while Damas extract gave 46.0%mortality. The concentrations which killed 50% of population (LC50) of Mesquite extracts for adult stage was 5.496 p.p.m after 24 hours, 3.880 p.p.m after 48 hours and 0.014 p.p.m after 72 hours. The concentrations which killed 50% of population (LC50) of Mesquite extracts for larvae instar was 8.940 p.p.m after 24 hours, 8.433 p.p.m after 48 hours and 6.903 p.p.m after 72 hours. The concentrations which killed50% of population (LC50) of Cafor extracts for adult stage was 8 p.p.m after 24 hours, 7.006 p.p.m after 48 hours and 2.476 p.p.m after 72 hours. The concentrations which killed 50% of population (LC50) of Cafor extracts for larvae stage was 34.361 p.p.m after 24 hours , 10.795 p.p.m after 48 hours and 0.192 p.p.m after 72 hours. The concentrations which killed50% of population (LC50) of Damas extracts for adult stage was 10.615 p.p.m after 24 hours, 8.779 p.p.m after 48 hours and 5.126 p.p.m after 72 hours. While the concentrations which killed50% of population (LC50) of Damas extracts for larvae stage was 12.342 p.p.m after 24 hours, 9.282 p.p.m after 48 hours and 4.426 p.p.m after 72 hours. The above result showed that Mesquite gave the lowest LC500.014 p.p.m after 72 hours for the adult as well as the lowestLC506.903 p.p.m after 72 hours for larvae. Therefore mesquite extract could be considered as promising and safe alternative for control of red flour beetle in stores using surface application methods .