Abstract
Field experiments were conducted on Zeuzera pyrina L. infested olive trees at El-Arish, North Sinai for three successive years 2002, 2003 and 2004 to evaluate the effects of insecticides and insect pathogen against this pest. The treatments suppressed significantly the population of the pest. Cidial was effective compound against Z. pyrina where the reduction of infestation reached 76.04%, 72.66% and 72.17% during the three successive years 2002, 2003 and 2004, respectively. While using amixture of Diazinon & Kaple 2 and Lebacid & Kaple 2 reduced the infestation by 77.95% and 72.75%, respectively during 2002. Reduction percentage by using insect pathogen nematodes was 100%. Conclusively, all experiments by using different pesticides on Zeuzera pyrina L. showed that the general mean percentage of reduction with Cidial 50% E.C. alone during studying period were between 72.66 % and 72.16 %. Also, the general percentage of reduction by using insect pathogen nematodes with direct injection in tunnels by rate 3000 individual pathogen nematodes/ ml. reached 100%.
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