Evaluations of Bacillus species against Callosobruchus chinensis , Callosobruchus maculatus (Coleoptera: Tenebrionidae) under laboratory and store conditions
Authors: Sabbour Magda and Maysa E. Moharam
Number of views: 259
Five strains of the entopathogenic bacteria Bacillus thuringiensis were evaluated against two stored products insect pests, Callosobruchus chinensis , Callosobruchus maculatus (Coleoptera: Tenebrionidae) . The LC50s of C. maculatus of different tested bactria which recorded that, 248, 269, 144, 88 and 110 Ug/ml after C. maculatus treated with different concentrations of B.T J, B.t 0900, Bt NRRL 2172, BT IP thurizide and Bt HD112.,under laboratory conditions ., respectively. The corresponding LC50s of C. chinensis, 233, 132, 145, 77 and 100 Ug/ml ., respectively . Udder store conditions the number of eggs laid per female of C. maculatus were significantly decreased and recorded 1.7±2.7, 5.3±0.5, 10.2±2.3, and 11.4±3.7 eggs/female after 20, 45, 90 and 120 days of storage after treated with BT IP thurizide ., respectively as compared 1.7±2.7to 19.8±2.5, 89.3±4.5. 91.5±5.5 and 99.8±1.9 eggs/female in the control. Under store conditions, the percentage of eggs laid/female were significantly decreased to 11.0±1.7 eggs/female after C. chinensis treated with BT IP thurizide after120 days as compared to 98.9±1.9 eggs/female in the control. In all bacterial treatments the percentage of emergence were significantly decreased to 1,1,1,4 and 6 with treated with BT IP thurizide .