Garden pesticides can kill bees and other beneficial insects, birds, and earthworms. They can contaminate nearby streams or ponds directly or through runoff. Chemical controls can backfire when insects develop resistance and become more difficult to control. There are many effective strategies for preventing and minimizing pest damage without using toxic chemicals. Just keep in mind that the complete elimination of pest damage is not realistic or even desirable.
Cabbage loopers are one of the garden pests that can be quite easily removed by hand.
Overall Philosophy Insect management should begin when you plan your garden or flowerbeds. A little extra thought at this stage can reduce your headaches later. Your insect problems will be determined largely by what you plant, where and when you plant it, and how you fertilize and cultivate. The next step is to set reasonable limits of pest damage. While you may not enjoy seeing holes in your lettuce leaves, you can tolerate some nibbles as long as you get a good crop of unchewed ones.