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Bugs That Eat Potato Plants

By Nannette Richford ; Updated September 21, 2017
The Colorado potato beetle is difficult to control.
Colorado potato beetle image by Alina Pismarova from Fotolia.com

Potatoes are an easy-to-grow vegetable that produce abundantly in a relatively small space if planted in containers or bags. These hardy plants tolerate frost and require little care -- unless they become infested with insect pests. Quick identification and a swift remedy is necessary to prevent considerable damage to the plants.

Colorado Potato Beetle

The larvae of the Colorado potato beetle strip the plant's foliage.
colorado bugs 2 image by amlet from Fotolia.com

Commonly referred to as "potato bugs," Colorado potato beetles can do swift damage to the foliage of potato plants. Although the adult striped beetle does not injure the plant, the larva does. Larvae overwinter in the soil, emerging when the potato plant is in full foliage, and quickly strip away the leaves. As they mature, the adults lay eggs on the undersides of leaves and begin the cycle anew. Without quick action, an infestation of potato bugs can defoliate your entire crop of potato plants within a week or two. Hand picking may be a choice if infestation is light or you only have a few plants. Otherwise, use insecticide labeled for Colorado potato beetles as these pests resist many generic insecticides and are difficult to control.

Other Beetles

Several varieties of beetles may cause damage to potato plants.
beetles image by saied shahinkiya from Fotolia.com

A number of blister beetles and flea beetles may also infest potato plants, eating away the foliage and leaving the plant unable to produce food. Growth may be stunted if the infestation is severe. Use insecticides labeled for blister and flea beetles to combat these pests.


Aphids often feed in colonies on the undersides of leaves.
green aphids image by joanna wnuk from Fotolia.com

Aphids attack potato plants and suck the juices from the plant. These tiny insects may be difficult to detect. The first sign you notice may be mottled foliage or deformed leaves. Look under leaves and along stems. Use an insecticide labeled for aphids to eradicate these pests as they make your plants more susceptible to other viral diseases.

Underground Pests

Both grubs (the larvae of beetles) and wire worms live in the soil and feed on the potato tubers. Although grubs may sever the roots and stunt the growth of the plant above the ground, both grubs and wire worms may feed on the tubers out of sight. When potatoes are harvested, holes may be discovered in the tubers. Treat your soil with insecticides labeled for wire worms or grubs if they are a problem in your area.


About the Author


Nannette Richford is an avid gardener, teacher and nature enthusiast with more than four years' experience in online writing. Richford holds a Bachelor of Science in secondary education from the University of Maine Orono and certifications in teaching 7-12 English, K-8 General Elementary and Birth to age 5.