Not all the insects, worms, spiders and flies that frequent our gardens should be considered pests . Many of them are actually beneficial for the plants we’re trying to grow, because they pollinate flowers, aerate the soil and/or prey on plant-eating insects. The use of pesticides will kill off these helpful critters; on the other hand, the services they provide for us might allow us to dispense with chemicals in our gardens entirely. Predatory insects are nature’s way of controlling other insect populations. For this reason, killing off all the bugs in our gardens indiscriminately can upset the natural balance and cause other types of pests to proliferate. We would do well, then, to identify those that are doing us a service. What follows is a list of 8 of the most common beneficial bugs: 1. Dragonflies These insects are most commonly found near water, but they can fly long distances to other areas. They are proficient hunters of flies and mosquitoes. Dragonflies co...