Efficiency of Some Pesticides and Botanicals in Controlling the Two-spotted Spider Mite Tetranychus urticae Koch (Acari: Tetranychidae) on Lemon Trees

Abstract

This study was conducted for examine pesticides Oxymatrin and Fenpyroximate, and hot aqueous extracts of Tephrosiasp and Populuseuphratica on the adult and egg stages of the two-spotted red mite Tetranychus urticae Koch (Acari: Tetranychidae), on lemon plant Citrus limonL..As for the findings, chemical pesticide Fenpyroximatewas obviousin reduction T. urticae eggs hatching to 24.72 compared to the pesticide Oxymatrin which recorded a hatching rate of 28.06%. In general, the hatching rate decreased clearly with the effect of increasing the concentration of the pesticide. As for the case of adults, Fenpyroximate also recorded the highest mortality rate of 73.06 compared to the pesticide Oxymatrin which recorded 70.56%. The 3-day period after treatment was the best in the mortality rate of adults compared to the other time periods. The plant extracts also had a clear effect on the eggs and adults of the used mites, as the Tephrosiaweed recorded a higher effect than the P. euphratica extract on the hatching percentage with values ​​of 73.06% and 76.39% respectively. Increasing the concentration of the plant extract to 1.5% led to the highest reduction in the hatching percentage. The mortality rate of adults recorded a clear increase due to the effect of the Hawira extract 47.71% compared to the Gharb grass which recorded 15.00% mortality which increased over the period of time after treatment with significant differences.