Delta Green Ground Beetle: Quick Facts and Essential Guide

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The Delta Green Ground Beetle is a small, metallic green carabid beetle native to California. Known for its striking appearance, this rare species has been found in the Jepson Prairie region of Solano County. The beetle’s life cycle remains a mystery, making it challenging to locate individuals and understand their population size.

These beetles have a particular affinity for living near the edges of the prairie’s large vernal pools, known as playa pools. As a part of the diverse predaceous ground beetle family, they contribute to maintaining ecological balance by preying on various insects and pests.

Despite its beauty and ecological significance, the Delta Green Ground Beetle faces the risk of habitat loss due to human activities. Understanding and preserving this species will require continuous monitoring and proper conservation efforts to ensure its survival in the delicate ecosystem of California’s Central Valley.

Delta Green Ground Beetle: Overview

Size and Appearance

The Delta Green Ground Beetle is a small insect, measuring only about 0.6 cm (1/4 inch) in length. This carabid beetle sports a distinctive metallic green color, with some bronze hues, making it stand out from other ground beetles1.

Habitats and Distribution

As for its habitat, the Delta Green Ground Beetle currently resides only in the Jepson Prairie region of Solano County1. This beetle prefers to live near the edges of large vernal pools, also known as playa pools1. It is essential to note that the beetle’s population size is largely unknown, and finding individual beetles can be quite challenging due to the limited understanding of its life cycle1.

Unfortunately, much of the beetle’s historical distribution remains a mystery. It is believed, though, that it may have once been found throughout much of California’s Central Valley2.

To sum up the key features of Delta Green Ground Beetle:

  • Small size: 0.6 cm in length
  • Metallic green and bronze appearance
  • Found only in Jepson Prairie region of Solano County
  • Lives near the edges of large vernal pools

Life Cycle and Reproduction


The life cycle of the Delta Green Ground Beetle begins with eggs. Female beetles lay their eggs in soil, often near the roots of plants. This provides the larvae with a food source once they hatch.


After hatching, the larvae of ground beetles are often found in lawns, where they feed on roots and other small insects. Some essential features of the larvae are:

  • C-shaped and white or cream-colored
  • Soft-bodied
  • Grow by going through several stages (instars)

During their development, the larvae help control pests that could harm your lawn.

Adult Beetles

Once fully developed, adult beetles are wingless, have a shiny green or black color, and possess strong jaws for predation. Here are some notable characteristics of adult beetles:

  • Active hunters
  • Nocturnal
  • Attracted to lights

Adult beetles play a crucial role in maintaining a healthy ecosystem by preying on various pests.

Comparison of Life Stages:

Life Stage Habitat Appearance Diet Role in Ecosystem
Eggs Soil near plant roots Tiny and oval-shaped N/A N/A
Larvae Lawns, soil near roots C-shaped, white/cream-colored Roots, insects Pest control
Adult Gardens, forests, grassy areas Shiny green/black, strong jaws Insects Predator, pest management

Ecological Importance

Predators and Prey

The Delta Green Ground Beetle is an important predator in its ecosystem. They feed on various pests such as caterpillars, keeping their population in check. At the same time, they serve as prey to higher predators, maintaining the balance in their ecosystem.


Though not primarily known as pollinators, some ground beetles, like the Delta Green Ground Beetle, may contribute to pollination indirectly while searching for prey near flowering plants. This could have a positive impact on plant species in their environment.

Ecosystem Contribution

The presence of these beetles indicates a healthy ecosystem. They contribute to the overall biological diversity in the areas they inhabit. Some important contributions of the Delta Green Ground Beetle include:

  • Pest control: They help naturally control pest populations, such as caterpillars and Japanese beetles, through predation.
  • Soil aeration: As they burrow and move in search of prey, they help aerate the soil, which benefits plant growth.

Comparison between Delta Green Ground Beetle and Japanese Beetle:

Feature Delta Green Ground Beetle Japanese Beetle
Size 0.6 cm 0.7 – 1.0 cm
Color Metallic green Metallic green and copper
Habitat Solano County, California, near vernal pools Native to Japan, invasive in North America
Role in ecosystem Predator, indirectly contributes to pollination Herbivore, damages various plant species

In conclusion, the Delta Green Ground Beetle plays an essential role in maintaining ecological balance in its habitat. Its contributions to pest control, pollination, and soil aeration make it an indispensable part of a healthy ecosystem.

Potential Damage and Infestations

Plants and Crops Affected

The Delta Green Ground Beetle is known to live only in the Jepson Prairie region of Solano County. It is not commonly seen as a pest that causes significant damage to lawns, plants, or crops. However, due to the limited knowledge about this beetle’s life cycle, their potential impact on plants is not fully understood.

Identifying Infestations

Due to the scarce information about the Delta Green Ground Beetle, it is difficult to provide definitive methods for identifying their infestations. Nevertheless, here are some general characteristics of ground beetles:

  • Majority are small to moderate in size, about 1/8 – 1/2 inches long
  • Flattened insects with obvious mandibles (jaws)
  • Mostly black or brown and iridescent, but the Delta Green Ground Beetle is characterized by its metallic green and bronze coloration

Comparison Table of Ground Beetles and Delta Green Ground Beetle

Feature Ground Beetles Delta Green Ground Beetle
Size 1/8 – 1/2 inches Similar to other ground beetles
Color Mostly black or brown, iridescent Metallic green and bronze
Habitat Various regions Jepson Prairie, Solano County
Pest Status Varies Limited known impact on plants

To properly identify the Delta Green Ground Beetle and assess any potential damage, you may want to consult with an entomologist or a specialist in beetle identification.

Pest Control and Prevention

Natural Pest Control Methods

Several natural methods can help manage delta green ground beetle populations. One such method is handpicking beetles, which is usually more effective in the morning and evening. Another option is to attract beneficial insects, like nematodes, that prey on ground beetles.

Neem oil is a popular organic insecticide for controlling pests. Advantages of neem oil include:

  • Safe for children and pets
  • Doesn’t harm beneficial insects
  • Biodegradable

However, neem oil may have some drawbacks:

  • Requires frequent application
  • May cause plant damage if used improperly

Chemical Insecticides

For a stronger approach, chemical insecticides can be considered. Two common chemical insecticides used for pest control include Spectracide Triazicide and Chlorantraniliprole. Here’s a comparison table for these two chemicals:

Feature Spectracide Triazicide Chlorantraniliprole
Active Ingredient Gamma-cyhalothrin Chlorantraniliprole
Soil Application No Yes
Systemic No Yes
Wildlife Friendly No More friendly
Pet and Child Safety Lower Higher

Another chemical option is imidacloprid, which is also a systemic insecticide. When using chemical insecticides, it’s crucial to follow the recommended application rates and safety precautions to minimize harm to children, pets, and wildlife.

In conclusion, there are multiple natural and chemical pest control methods available to manage delta green ground beetle populations. Remember to carefully evaluate each treatment’s pros and cons, and consider the safety recommendations to protect the environment, children, and pets.

Delta Green Ground Beetle Guide

Taxonomy and Species Diversity

The Delta Green Ground Beetle, scientifically known as Elaphrus viridis, is a small metallic green carabid beetle measuring only 0.6 cm in length 1. This beetle is part of the Carabidae family, which includes over 40,000 species of ground beetles worldwide 2.

Some key features of the Delta Green Ground Beetle include:

  • Metallic green color
  • Approximately 0.6 cm long
  • Belongs to the Carabidae family

When comparing the Delta Green Ground Beetle to other ground beetles, it stands out because of its stunning metallic green color and its relatively small size.

Common Habitats in North America

Delta Green Ground Beetles are currently known to live only in the Jepson Prairie region of Solano County, California. Their preferred habitat is near the edges of large vernal pools, known as playa pools. Unfortunately, habitat loss has led to a significant reduction in their range.

Although the beetle’s population size is unknown, it’s essential to protect and preserve their habitat to ensure their survival. In comparison to other ground beetles found in states like Louisiana, Virginia, and Wisconsin, the Delta Green Ground Beetle has a highly restricted and specific habitat.

Tips for Encouraging Delta Green Ground Beetles

Creating a Beetle-Friendly Garden

Delta green ground beetles are beneficial insects that can help control pests in your garden. To encourage them, follow these tips:

  • Provide Shelter: Create hiding spots for ground beetles using rocks, logs, or leaves. These natural shelters provide protection from predators and harsh weather conditions.

  • Plant Diversity: Incorporate various plant groups into your garden, including native flowers and plants. This will support beetles by attracting their prey, such as spiders and other insects, while discouraging weeds from spreading.

Do not use pesticides in your garden, as many chemical products can harm beneficial insects. Instead, opt for organic or natural pest control methods.

  • Lawn Care: Keep your lawn mowed and well-maintained to avoid creating breeding grounds for pests. This helps beetles by preventing the accumulation of thatch which can provide hiding spaces for harmful insects and weeds with deep roots.

Beetle-friendly gardens can promote wildlife and a healthy ecosystem, resulting in a balanced and thriving environment. Enjoy the benefits these fascinating insects bring to your garden by making it an inviting place for them to thrive.

Comparison Table:

Feature Benefits Drawbacks
Beetle-friendly Supports beneficial insects, reduces pests May require more maintenance (e.g., weeding)
Pesticide-dependent Quick pest control Can harm beneficial insects, including beetles, and other wildlife

Characteristics of Delta Green Ground Beetles:

  • Metallic green and bronze color
  • Found near vernal pools
  • Prefer undisturbed environments

Invasive Species and Their Impact

Japanese Beetles and Their Effects

Japanese beetles, an invasive species, are known for causing significant damage to various crops and plants. These beetles are especially harmful to agricultural crops like beans and corn. Here are some effects of Japanese beetles on these crops:

  • Bean: The beetles severely damage leaves, limiting photosynthesis, and overall plant growth
  • Corn: They affect the silks, which are essential for pollination, and can severely decrease yields

To protect plants from the impact of invasive species like the Japanese beetle, some effective methods include using row covers or trapping techniques. Here are some pros and cons of these methods:

Row Covers:

  • Pros:
    • Effective physical barrier
    • Protects plants from various pests
  • Cons:
    • Can be difficult to install
    • May limit sunlight and airflow

Trapping Techniques:

  • Pros:
    • Attracts and removes beetles from the area
    • Low-cost solution
  • Cons:
    • May lure more beetles if placed too close to crops
    • Requires regular maintenance

By understanding the effects of invasive species like the Japanese beetle, we can develop effective strategies to protect agriculture and the environment.

Method Pros Cons
Row Covers Effective barrier, protects plants from pests Difficult to install, limits sunlight and airflow
Trapping Techniques Attracts beetles, low-cost solution May attract more beetles if too close, requires maintenance


  1. U.S. Fish and Wildlife Service 2 3 4 5

  2. Essig Museum of Entomology 2

Reader Emails

Over the years, our website, has received hundreds of letters and some interesting images asking us about these insects. Scroll down to have a look at some of them.

Letter 1 – Bark Gnawing Beetle, not Ground Beetle


shiny green bug
Sat, May 23, 2009 at 7:44 PM
bit me, just wondered what it is, never seen one before
se wa state

Unknown Ground Beetle
Bark Gnawing Beetle

Dear Leona,
This is a Ground Beetle in the family Carabidae, but we are not having much luck with the species. We will contact Eric Eaton for assistance, and perhaps one of our readers will know the answer.

Correction: One of our readers wrote in with a tip that this is a Bark Gnawing Beetle in the genus Temnoscheila based on images posted to BugGuide.


  • Bugman

    Bugman aka Daniel Marlos has been identifying bugs since 1999. is his passion project and it has helped millions of readers identify the bug that has been bugging them for over two decades. You can reach out to him through our Contact Page.

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  • Piyushi Dhir

    Piyushi is a nature lover, blogger and traveler at heart. She lives in beautiful Canada with her family. Piyushi is an animal lover and loves to write about all creatures.

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Tags: Ground Beetle

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2 Comments. Leave new

  • Hi Guys,
    Bugguide has Bark-chewing beetles in the Genus Temnoscheila that seem to match this one! Have a great day and say Hi to the Angelfish for me.

  • My son picked up this same bug on our hike today. However, he did not get bit. We took a picture, and it was not easy to find the type of bug online.

    I am glad you listed it.


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