Shaped like a shield, sap-sucking stink bugs are brown, green or mottled. They feed on a wide variety of edible plants, including various fruit trees and some ornamentals. Fruits become puckered, scarred and distorted as a result of the feeding. The eggs are light red to yellow-red and are found on the undersides of leaves. Read more about controlling stink bugs.

Somewhat flat in shape, squash bugs are dark brown or black and congregate at the base of plants or under dead foliage. They have piercing mouthparts that suck plant sap, causing yellow spots on leaves that will often later wilt, blacken, die and fall off. The eggs are long and yellow in color. Read more about controlling squash bugs.

Flying or jumping when disturbed, these small, thin, wedge-shaped insects come in shades of green, brown and yellow, depending on the species. Leafhoppers feed on a variety of edible and ornamental plants and cause leaves to lose color, turn brown and become stippled. They also leave behind black excrement. Read more about controlling leafhoppers.

Notorious for skeletonizing leaves of a wide variety of edible and ornamental plants, Japanese beetles have iridescent copper wings and a metallic-green thorax and head. Underneath they have small tufts of white hairs along the sides of their abdomens. The slightly curved, lawn-damaging larvae, also known as grubs, are gray-white with brown heads. Read more about  controlling Japanese beetles.

Named appropriately, flea beetles are tiny green or black beetles that jump like common fleas. They attack a wide range of plants, including fruits, vegetables and ornamentals. Adult flea beetles create pinholes in leaves. Read more about controlling flea beetles.

Distinctive 1/2-inch-long yellow insects, Colorado potato beetles feature black, brown and yellow stripes on their wing covers. They gobble up and skeletonize the foliage on plants in the nightshade family, including potatoes, eggplant, peppers and tomatoes. Female beetles lay clusters of bright yellow-orange eggs on the undersides of the leaves. Hump-backed larvae hatch from these eggs and molt several times during feeding, growing fatter each time. Read more about controlling Colorado potato beetles.

Green, hairy cabbageworms have a velvety appearance and a row of light spots along their backs. These voracious feeders eat vegetable plant leaves, creating large, irregular holes, often along the midrib. When feeding on cabbage, these worms bore directly into the head. Their excrement consists of greenish-brown pellets. After two to three weeks of feeding, the wormlike larvae pupate and attach themselves to stems by a silk thread. The adult form, the imported cabbageworm butterfly, is easy to spot. It's white, with one to four black spots on its wings. Read more about controlling cabbage worms.

Several species of this sap-sucking, winged pest exist. You'll find aphids in green, black, yellow or red. They attack edible and ornamental plants, including garden roses, causing stunted growth, curling and yellowing leaves, and a honeydew buildup that leads to black, sooty mold. Honeydew produced by aphids attracts ants as well, so include them in your treatment plan. Read more about controlling aphids.

When you're in the garden picking homegrown produce and find telltale bite marks on your plants, chances are you have insect pests. Knowing what you're dealing with when it comes to insects allows you to choose the best pesticide for getting rid of those uninvited dinner guests. These 20 common garden troublemakers target edible crops, ornamentals or both:

Many cucumbers are susceptible to fungal issues and pests, especially when vines get crowded and air can't circulate well. Trellising helps improve airflow and circumvent some fungal problems. But stubborn fungal diseases such as downy mildew, powdery mildew and black rot call for prevention and intervention. When conditions favor disease development or your see signs of fungal problems, turn to liquid Daconil Fungicide Ready-To-Use to control, stop and prevent fungal disease.

For common pests such as cucumber beetles, aphids, squash bugs and flea beetles, you can pick the pesticide product that works best for you. Liquid Sevin Insect Killer Concentrate and Sevin Insect Killer Ready to Spray kill more than 500 insect pests by contact and keep protecting your cucumbers for up to three months.+ Just allow one day between using these two Sevin products and enjoying a cucumber harvest.

If you prefer dusting, Sevin Insect Killer Dust Ready To Use kills more than 150 insect pests and can be used up to three days before harvesting cucumbers. Sevin Sulfur Dust can be used as a dust or spray to control powdery mildew on cucumbers, too.