Field trial was conducted during two successive seasons on 2015 and 2016 at greenhouse experimental area, Dokki, Giza Governorate. This study aims to evaluating the efficiency of different colors mulch and some environmental factors on reduction of population density to the main sap-sucking pests infesting cucumber and yield.  The trial were used five colors mulch to  covering soil, i. e., red, green, blue, white, yellow and Control treatment without mulch. The results revealed that there are significant differences between using colors mulch with population densities of some pests the whitefly, Bemisia tabaci (Genn.), the thrips, Frankliniella intonsa( Trybom) and  the spider mite, Tetranychus urticae (Koch ).  The tested mulch colors could be arranged according to population density of pests into six ecosystems. The red and white colors was the most potent treatments in low population  pests in cucumber plants followed by blue, control, yellow and green which was the highest mean number of infestation in both seasons. Maximum and Minimum temperature were showed insignificant positive effect in first season but Minimum temperature was showed significant positive on B. tabaci (egg and nymph) during second season. Maximum and Minimum temperature were showed insignificant positive effect with F. intonsa and T. urticae (egg and immature) at the both seasons. The relative humidity had insignificant negative effect on B. tabaci, F. intonsa and T. urticae at the both seasons. The soil temperature had insignificant negative effect on B. tabaci, F. intonsa and T. urticae at the both seasons. The combined effect (E.V) of these ecological factors on B. tabaci (egg and nymph) , F. intonsa and T. urticae (egg and immature) showed that these factors were responsible as a group for 94 % , 79 %, 83, 89, 98, 87, 99, 99, 93, 95 effects on the population dynamics of pests throughout both seasons, respectively. Especially infestation pests - Yield relationship, the mulch colors affect 75% and 82% in yield weight both seasons. Recommendation: the paper recommendation by cover soil surface with red and white mulch to reduce population of whitefly, thrips and red mite and increase yield.