Potato Bugs In California: A Comprehensive Guide

Potato bugs, also known as Jerusalem crickets, are a common pest in gardens across California. If you’ve noticed these large, flightless insects in your yard or garden beds, you’re probably wondering what they are and how to get rid of them.

If you’re short on time, here’s a quick answer to your question: Potato bugs are a species of insect that feed on the roots and tubers of plants, especially potatoes. They can damage gardens but are not dangerous. The best ways to control them include hand-picking, traps, diatomaceous earth, and insecticides.

What Are Potato Bugs?

Potato bugs, also known as Colorado potato beetles, are a common pest found in California. These bugs belong to the scientific name Leptinotarsa decemlineata, and they are a member of the beetle family Chrysomelidae. They are easily recognizable by their distinct physical appearance.

Scientific Name and Physical Appearance

The scientific name of potato bugs, Leptinotarsa decemlineata, refers to their ten distinct black stripes on their yellow-orange wings. These bugs are approximately 1/4 inch long and oval-shaped. They have a hard exoskeleton and six legs, with the ability to move quickly.

Adults have a distinct yellow head and a brownish-black body.

Habits and Behavior

Potato bugs are notorious for their feeding habits and their preference for potato plants. They are known to feed on the leaves and stems of potato plants, causing significant damage if not controlled.

These pests can quickly defoliate an entire potato plant, leading to reduced yield and potential crop failure.

Furthermore, potato bugs have a remarkable ability to adapt to their environment. They can develop resistance to certain insecticides, making them challenging to control. These bugs are most active during the warm months, thriving in temperatures above 50°F (10°C).

Reproduction and Life Cycle

The life cycle of potato bugs consists of four stages: egg, larva, pupa, and adult. The adult females lay bright yellow-orange eggs on the underside of potato leaves, typically in clusters. These eggs hatch into larvae, also known as “potato bug grubs,” which are orange with black heads.

The larvae undergo several molts, growing larger with each stage. After completing their final molt, they enter the pupa stage, during which they transform into adults. The pupa is usually found in the soil near the potato plant, where it remains for a few weeks before emerging as an adult beetle.

The entire life cycle of a potato bug can range from 21 to 30 days, depending on environmental conditions. They can complete multiple generations in a single growing season, leading to an exponential increase in their population if left uncontrolled.

For more detailed information about potato bugs, you can visit the University of California Statewide Integrated Pest Management Program website.

Are Potato Bugs Harmful or Dangerous?

Potato bugs, also known as Colorado potato beetles, are a common sight in California gardens. These insects can cause significant damage to potato plants, but are they harmful or dangerous to humans and pets? Let’s take a closer look.

Potato Bug Diet

Potato bugs primarily feed on potato plants and related crops, such as tomatoes and eggplants. They have a voracious appetite and can quickly defoliate plants if left unchecked. Farmers and gardeners often struggle to control these pests to protect their crops.

However, it’s important to note that potato bugs do not seek out humans or pets as a food source. They are not attracted to our homes or living spaces. Instead, they are primarily interested in devouring the foliage of potato plants.

No Serious Health Risks to Humans or Pets

While potato bugs can be a nuisance for gardeners, they do not pose any serious health risks to humans or pets. These insects are not known to transmit diseases and do not possess venomous bites or stings. Therefore, coming into contact with a potato bug is generally harmless.

It’s worth mentioning that some people may experience mild skin irritation or allergic reactions when handling potato bugs. This is not common, but if you have sensitive skin or known allergies, it’s best to wear gloves when dealing with these insects.

If you have pets, it’s important to monitor their behavior around potato bugs. While the bugs themselves are not harmful, some pets may try to eat them, which could lead to an upset stomach or potential digestive issues.

It’s always a good idea to discourage pets from consuming any insects, just to be on the safe side.

Controlling and Removing Potato Bugs

Hand Removal

One of the most effective methods for controlling and removing potato bugs is through hand removal. While it may be a labor-intensive process, it can be highly effective in reducing the population of these pests in your garden.

Simply inspect your potato plants regularly and remove any potato bugs you find by hand. Make sure to wear gloves to protect your hands from their bites. This method is especially useful for small infestations or if you prefer a more organic approach to pest control.


Another method to control potato bugs is by using traps. These traps are designed to attract and capture the bugs, preventing them from damaging your potato plants. You can purchase pre-made traps or make your own using materials like sticky yellow cards or containers filled with soapy water.

Place these traps near your potato plants to lure and catch the bugs. Regularly check and dispose of the trapped bugs to ensure effectiveness.

Diatomaceous Earth

Diatomaceous earth is a natural and non-toxic powder made from the fossilized remains of diatoms. It is an effective method for controlling potato bugs as it works by dehydrating and killing them. Sprinkle a thin layer of diatomaceous earth around your potato plants, focusing on the areas where the bugs are most commonly found.

The bugs will come into contact with the powder, leading to their demise. Remember to reapply after rain or watering.


If the infestation is severe and other methods have proven ineffective, the use of insecticides may be necessary. There are various insecticides available specifically designed to target potato bugs. Before using any insecticide, carefully read and follow the instructions provided by the manufacturer.

It is important to choose an insecticide that is safe for use on edible crops and follow the recommended application rates. Additionally, consider using insecticides as a last resort and try other methods first to minimize the impact on beneficial insects and the environment.

Remember, when dealing with potato bugs, it is important to monitor your plants regularly, be proactive in pest control measures, and use a combination of methods for the best results. By implementing these strategies, you can effectively control and remove potato bugs from your garden, ensuring healthy potato plants and a bountiful harvest.

Preventing Potato Bugs in the Future

Dealing with potato bugs can be a frustrating experience, but there are several preventive measures you can take to minimize the risk of future infestations. By implementing these strategies, you can protect your potato plants and ensure a healthy harvest.

Sanitation and Crop Rotation

One of the most effective ways to prevent potato bugs is through proper sanitation and crop rotation. After harvesting your potatoes, make sure to remove any leftover plant debris from the garden. Potato bugs can overwinter in this debris, so getting rid of it will significantly reduce the population in the following season.

Additionally, practicing crop rotation can disrupt the life cycle of potato bugs. This involves planting potatoes in a different area of your garden each year, as potato bugs tend to lay their eggs near where they fed the previous season.

By moving your potato plants to a new location, you can make it more difficult for the bugs to find and infest them.

Insect Barriers

Using insect barriers is another effective preventive measure against potato bugs. These barriers can be physical or organic. Physical barriers, such as floating row covers or mesh netting, can be placed over your potato plants to prevent bugs from reaching them.

Organic barriers, such as diatomaceous earth or wood ash, can be sprinkled around the base of the plants to create a barrier that the bugs find unpleasant or difficult to cross. These barriers act as a deterrent and can help reduce the likelihood of infestation.

Natural Predators

Introducing natural predators into your garden can be an eco-friendly and effective way to control potato bugs. Ladybugs, lacewings, and ground beetles are natural enemies of potato bugs and can help keep their population in check.

You can attract these beneficial insects to your garden by planting flowers and herbs that provide them with nectar and shelter. Additionally, avoiding the use of broad-spectrum insecticides will help preserve the population of these natural predators, allowing them to thrive and control the potato bug population.

By implementing these preventive measures, you can greatly reduce the risk of potato bug infestations in the future. Remember to stay vigilant and regularly monitor your plants for any signs of pests. With proper care and attention, you can enjoy a bountiful and bug-free potato harvest!


Potato bugs are a nuisance in California gardens, but with the right techniques, you can control their population and minimize damage. By learning their habits, using removal and chemical control methods, and taking preventative measures, you can keep potato bugs from becoming a recurring problem.

While potato bugs seem creepy and invasive, they are a natural part of our ecosystem and play an important role. With some persistence and the methods outlined here, you can reach a healthy balance and still enjoy homegrown vegetables.

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