Gardner FlyWeb Universal Insect Monitor Cards, Blue/Yellow - FW-74 - Box of 10 PacksGardners Insect Monitor Cards are designed to capture all types of insects that harbor in and around plants. Catch rates of the different species of insects is maximized by using two insect attracting colors on each trap; brilliant blue and yellow. Fungus gnats, white flies, aphids, thrips, and leafminers are just a few of the species attracted to our traps. Tear apart at perforations for use in smaller areas or close to base of plants.