Colorado Beetle 101: All You Need to Know About the Infamous Potato Pest

Colorado Beetle
4 min reading time

Have you seen a brightly colored, stripey beetle scurrying around your garden lately? If so, then chances are you’ve spotted a Colorado Beetle! These beetles are native to the US and Canada, where they can be found in almost every state. In this blog post, we’ll take a closer look at what makes these gorgeous little bugs so special – from their vibrant colors to their unusual habits.

About Colorado Beetle

The Colorado potato beetle (Leptinotarsa decemlineata) is a serious pest of potatoes and other nightshade plants. It is native to North America and was first identified in the 19th century. The beetle gets its name from the state of Colorado, where it was first described.


Adult beetles are about 1/4 to 3/8 inch long and have an oval shape with a bright yellow-orange color and black stripes on their wings. Their larvae have a reddish-brown color with black heads and can grow up to 1/2 inch long.

Life cycle

They typically have one or two generations per year, depending on the climate. The adults overwinter in soil or debris and emerge in the spring to mate and lay eggs on the undersides of leaves. The larvae hatch within a week and feed on the leaves, defoliating the plant. After 10-14 days of feeding, the larvae pupate in the soil, and adult beetles emerge within 7-10 days.


They can cause significant damage to potato plants, especially if left untreated. They feed on the leaves, stems, and tubers of the potato plant, which can reduce yield and even kill the plant if severe enough. The larvae are particularly destructive and can defoliate a plant quickly.

colorado beetle on a plant

Control methods

There are several methods for controlling Colorado beetles, including cultural and chemical controls. Cultural controls include crop rotation, removing plant debris, and planting resistant varieties. Chemical controls include insecticides that are applied to the foliage or soil. However, there is concern about the development of resistance to chemical controls, so it’s important to rotate insecticides and use them only when necessary.

Economic impact

They are a significant economic threat to the potato industry. In addition to reducing yields and quality, controlling these beetles can be expensive and time-consuming. The estimated cost of controlling these beetles in the United States is over $200 million per year.

Natural predators

There are several natural predators of these beetles, including birds, spiders, and other insects. Parasitic wasps and nematodes can also be used as biological controls. However, these methods are not always effective or practical for large-scale potato production.

Frequently Asked Questions (FAQs)

What is the history behind the Colorado beetle’s name?

The Colorado beetle was first discovered in Colorado in 1824 by a naturalist named Thomas Say. The beetle was given the name “Colorado potato beetle” because it was found feeding on potato plants in Colorado.

How do farmers and gardeners track the presence of Colorado beetles in their crops?

One way to track Colorado beetles is by using pheromone traps. These traps emit a chemical scent that attracts the beetles, allowing farmers and gardeners to monitor and control their populations.

Can Colorado beetles survive extreme weather conditions, such as droughts or floods?

These beetles are able to enter a state of diapause, or suspended animation, during periods of extreme weather, which allows them to survive until conditions improve.

What are some interesting adaptations that Colorado beetles have made to their environment?

These beetles have evolved resistance to many different pesticides, which has made them difficult to control. They have also developed the ability to detect and avoid plants that have been treated with pesticides.

What are some natural ways to control Colorado beetles?

Some natural ways to control these beetles include removing any infected plants, handpicking and crushing the beetles, using insecticidal soap, and introducing natural predators like birds and insects. Crop rotation is also an effective way to prevent infestations.

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