About Klamath Weed Beetle
A dark bronze to coppery-brown beetle with a convex, heavily punctured body. It was introduced to control the invasive Klamath weed (St. John's wort) and became a classic biocontrol success story.
Did You Know?
Its introduction to California in the 1940s reduced Klamath weed infestations by over 99%, saving millions of acres of rangeland.
How to Identify Klamath Weed Beetle
Klamath Weed Beetle (Chrysolina quadrigemina) belongs to the order Coleoptera, family Chrysomelidae. Adults typically measure 5-7 mm.
Klamath Weed Beetle Habitat
Klamath Weed Beetle is found in grasslands habitats, particularly across Europe (native), introduced to North America, Australia. This species has adapted to thrive in its preferred environment, where it can find suitable food sources and shelter.
Klamath Weed Beetle Diet and Feeding
Klamath Weed Beetle is a herbivore, feeding on plant material including leaves, stems, flowers, and other vegetation. Herbivorous insects play a significant role in ecosystems by influencing plant growth and serving as a food source for predators.
Where Is Klamath Weed Beetle Found?
Klamath Weed Beetle can be found in Europe (native), introduced to North America, Australia, where it inhabits grasslands environments. Its distribution is influenced by climate, food availability, and habitat suitability.
Distribution Map
Where Klamath Weed Beetle can be found
Is Klamath Weed Beetle Dangerous?
Klamath Weed Beetle is generally harmless to humans. It does not bite or sting and poses no significant health risk. Like most insects, it prefers to avoid human contact and will typically flee rather than confront a perceived threat.
Klamath Weed Beetle Role in Nature
Klamath Weed Beetle is part of the food web as a primary consumer, feeding on plant material. It serves as an important food source for birds, bats, amphibians, and other insectivores, connecting plant energy to higher trophic levels.
Seasonal Activity
Frequently Asked Questions About Klamath Weed Beetle
What does Klamath Weed Beetle look like?
The Klamath Weed Beetle typically measures 5-7 mm.
Where is Klamath Weed Beetle found?
The Klamath Weed Beetle is found in Europe (native), introduced to North America, Australia and typically inhabits grasslands environments.
What does Klamath Weed Beetle eat?
The Klamath Weed Beetle feeds on plant material including leaves, stems, and other vegetation.
Is Klamath Weed Beetle dangerous to humans?
The Klamath Weed Beetle is generally harmless to humans. It does not bite or sting and poses no significant health risk.
What is an interesting fact about Klamath Weed Beetle?
Its introduction to California in the 1940s reduced Klamath weed infestations by over 99%, saving millions of acres of rangeland.
Cite This Page
APA:
InsectDiscover. (2026). Klamath Weed Beetle (Chrysolina quadrigemina). Retrieved from https://insectdiscover.com/insect/klamath-weed-beetle
MLA:
"Klamath Weed Beetle." InsectDiscover, https://insectdiscover.com/insect/klamath-weed-beetle.