Remove the covers, if necessary, for pollination and then replace them again. In very warm climates, you may need to remove the covers if the temperature underneath gets too warm for your plants. When using row covers, it helps to know a bit about the life cycle of the pest you're trying to control. If that insect overwinters in the soil, you may actually be trapping the emerging larvae underneath the covers. In this case, cultivate the soil before you plant to expose the insects to birds and other predators.
Traps can attract insects by using color, taste, and sex hormones.
For example, yellow sticky traps will lure aphids, whiteflies, thrips, and leaf miners. Slugs have a particular liking for stale beer and will drown in a shallow saucer of it placed in the garden. Japanese beetle traps commonly use sex hormones and floral lures to attract the adult insects to them. Predators and Parasites These insects, often called beneficial insects, are the ones you want to encourage in your garden. The most well-known predatory insects are ladybugs and their larvae.