About Black Headed Birch Sawfly
A medium-sized sawfly with a dark head and orange body. Larvae are greenish-blue with black heads and feed communally on birch and alder leaves.
Did You Know?
When a predator approaches, the entire colony of larvae simultaneously rears up and thrashes, making the group appear larger and more threatening.
How to Identify Black Headed Birch Sawfly
Black Headed Birch Sawfly (Craesus alniastri) belongs to the order Hymenoptera, family Tenthredinidae. Adults typically measure 7-9 mm.
Black Headed Birch Sawfly Habitat
Black Headed Birch Sawfly is found in woodlands habitats, particularly across Europe. This species has adapted to thrive in its preferred environment, where it can find suitable food sources and shelter.
Black Headed Birch Sawfly Diet and Feeding
Black Headed Birch Sawfly 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 Black Headed Birch Sawfly Found?
Black Headed Birch Sawfly can be found in Europe, where it inhabits woodlands environments. Its distribution is influenced by climate, food availability, and habitat suitability.
Distribution Map
Where Black Headed Birch Sawfly can be found
Is Black Headed Birch Sawfly Dangerous?
Black Headed Birch Sawfly belongs to the order Hymenoptera, which includes many stinging insects. While not typically aggressive, it may sting if threatened or handled. Stings can cause pain and swelling, and in rare cases may trigger allergic reactions in sensitive individuals.
Black Headed Birch Sawfly Role in Nature
Black Headed Birch Sawfly 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 Black Headed Birch Sawfly
What does Black Headed Birch Sawfly look like?
The Black Headed Birch Sawfly typically measures 7-9 mm.
Where is Black Headed Birch Sawfly found?
The Black Headed Birch Sawfly is found in Europe and typically inhabits woodlands environments.
What does Black Headed Birch Sawfly eat?
The Black Headed Birch Sawfly feeds on plant material including leaves, stems, and other vegetation.
Is Black Headed Birch Sawfly dangerous to humans?
The Black Headed Birch Sawfly belongs to the order Hymenoptera, which includes stinging insects. While not typically aggressive, it may sting if threatened or handled.
What is an interesting fact about Black Headed Birch Sawfly?
When a predator approaches, the entire colony of larvae simultaneously rears up and thrashes, making the group appear larger and more threatening.
Cite This Page
APA:
InsectDiscover. (2026). Black Headed Birch Sawfly (Craesus alniastri). Retrieved from https://insectdiscover.com/insect/black-headed-birch-sawfly
MLA:
"Black Headed Birch Sawfly." InsectDiscover, https://insectdiscover.com/insect/black-headed-birch-sawfly.