Insect infestations are often an indicator of plant health. A stressed or weak plant is more susceptible. So, in a way, bad bugs can often be a useful indicator of conditions in your garden. While, on the flip side, if your plants and soil are healthy, good bugs can often be counted on to prey on insects you dont want in your garden. Nature has an amazing way of balancing things out and it is our job to create a healthy environment so this symbiosis can occur.