For the most part, most herbs don't have too many serious problems with insects. Regarding herbs, there are probably more that actually work as a defense against harmful invaders than there are those that can be attacked by an insect!
In the rare event that they do have a problem, we have to decide whether or not we want to spray plants with chemicals that most likely will end up in the food we eat.
Some herb plants, such as Fennel, are host plants for wonderful insects like the Monarch butterfly. If you kill the caterpillar, you kill what would become the butterfly.
In the unlikely event there is a serious insect infestation it's best to use natural or organic products such as insecticidal soap, products containing Neem oil, or a host of natural home remedies.
Go to next page to find remedies for controlling insects in your herb garden.