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Title: Efficacy of Nomuraea rileyi and Spinosad against Olive Pests under Laboratory and Field Conditions in Egypt
Authors: Sabbour M.M.
Aff: Department of Pests and Plant Protection, National Research Centre, Dokki, Cairo, Egypt
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Keywords: Bactrocera oleae, Ceratitis capitata, Prays oleae; Nomuraea rileyi, Spinosad
Abstract:Isolates of the entomopathogenic fungus, Nomuraea rileyi and the microbial pesticide spinosad were tested against the olive insect pests: Bactrocera oleae, Ceratitis capitata and Prays oleae under laboratory and field conditions. Results obtained showed that the LC50 of N. rileyi for P. Oleae, C. capitata and B. oleae were 142, 145 1nd 155 spores/ml after treated with different concentrations the fungus under laboratory conditions. The corresponding figure for Spinosad were 165, 176 and 178 spores/ml. Under field conditions, results showed that during season 2011, The percentage of P. Oleae, C. Capitata and B. oleae, infestations were significantly decreased in plots treated with N. rileyi to 10 3.1; 13 3.0 and 10 2.2 individuals as compared to 383.4, 312.4 and 333.2 individuals of the corresponding pests in the control, during season 2011 in El-Esraa (Nobaryia) after 90 days of post application. When Spinosad were applied in the field, the percentage of infestations were significantly decreased in all both two seasons. During the harvest season, the olive fruits weight were 2998 32.32 Kg/Feddan in the plots treated with N. rileyi and plots treated with Spinosad the olive fruits collected weighted 2847 42.51 Kg/Feddan as compared to 2219 24.82 Kg/Feddan in the control during season 2011. During season 2012 the treatments trees with N. rileyi scored the highest weight 3090 Kg/ Feddanas compared to 2169 80.53 Kg/Feddan among the control trees.