In greenhouse tomato grow; growers mostly prefer to use chemical application against Greenhouse whitefly [Trialeurodes vaporariorum (Westw.) (Hemiptera: Aleyrodidae)] and to increase yield, Humic matter (HM) application is preferred together with pesticide applications. However, some indications have been found on effect of HM while applied as mix with pesticides into pesticide performance and pesticide degradation duration. For that reason research has been done between 2009-2011 to determinate changes on efficiency against Greenhouse whitefly, effect period and leaf residue degradation process of selected insecticides, applied as foliar and soil together with HM. Alone application of HM, both as foliar and soil application, was not effective against Greenhouse whitefly, but performance of imidacloprid and pymetrozine has increased in mix application of fulvic acid (FA). When changes on degradation process of HM and insecticide mixture in application tank were investigated, important difference was not determinate. Foliar and sole applied of imidacloprid residue level was higher than imidacloprid application, which was applied as foliar and mixed with both HM and it was seen that HM accelerated degradation process of active matter. When imidacloprid was applied into the soil together with FA, uptake of it by the plant was increased and extended of degradation by slowing down process. In contrast to FA, the mixture of imidacloprid and HA application into the soil, active matter transport was delay consequently acceleration on degradation process in leafs. As a conclusion, it was determinates that mixture of pesticides with HM, may cause effects on both organism and residue degradation process on plants, and that may vary depends on HM content and pesticide chemical characteristic.