Cabbage (Brassica oleracea L. Var. capitata Alef.) is one of the main vegetable cultures. By area and production it's on the fourth place in the world, behind tomatoes, onion and watermelon. It has been grown in the world at 210.000 ha with the average harvest of 22 t/ha. In the Republic of Croatia it has been grown at the area of about 8.000 ha with the average harvest of 24 t/ha. Cabbage Whitefly (Aleyrodes proletella L.) is a pest which presents a big problem in the last six to seven years and if it is not repressed it can cause a big damage. Aiming to research insecticide efficiency of the active substance spirotetramata field trial at OPG Cafuk near Varaždin was conducted. Trial was set up according to randomized block design with four replication swith six varieties, including the control. The size of the basic trial plot was 21 m². Scanning and taking the samples was done at 20 plants in two middle rows from each trial plot. The scanning was done before treatment, 24 hours and seven days after each application. After the trial, the results showed that the active substance spirotetramat (Movento 100 SC) is the most efficient in repressing the Cabbage Whitefly when applied at the beginning of contamination, but also in the combination with active substance deltametrin (Decis) which contributes to better protection.