The present study was conducted in the laboratory to assess the effects of two plant extracts (Jatropha curcas & Euphorbia lathyris ) with four solvents (chlorophorm, ethyl acetone, acetone and methanol) on eggs and adult females of Tetranychus urticae Koch (Acari : Tetranychidae) at laboratory condition (27±2°C and 65±5% RH.). The results revealed that, the Jatropha curcas and Euphorbia lathyris gave high effected at concentrations 2.4 and 1.2% after 24, 48 and 72h. for adult females of T. urticae. While at concentration, 0.6% gave good results after 72 h. for the two extracts. Also,  the concentration of 0.3% was not effective, except for J. curcas when used the acetone as a solvent. The acetone was the best solvent followed by chlorophorm and ethyl acetate. But, the solvent of methanol was not effective for the two plant extracts. The extract of J. curcas was more effective on eggs of T. urticae than the extract of E. lathyris; and the concentration of 2.4% was the best for its effect on eggs. However, the concentrations of 0.6 and 0.3% were slightly effective on eggs of T. urticae.