Watch out for garden bugs: Summer is party season for many garden pests and diseases such as spider mites, leaf rollers, aphids, chinch bugs, fleas, ticks, chiggers, grubs, scale, powdery mildew and webworms. Some ornamental plants, such as roses, are especially susceptible to aphids and powdery mildew, so stay on top of these problems before they take their toll in your garden. To manage pests, start with the least invasive methods possible — handpicking them or hitting them with a hard spray of water. If they aren't causing too much damage, you may opt to leave them be, but if they begin ravaging your tomatoes or ruining your lawn, be sure you identify the pest or disease you are dealing with before you treat with any chemicals. Your local county extension office or trusted nursery will be able to help you identify the problem and choose an appropriate treatment.