About Mountain Ash Sawfly
A small blackish sawfly with pale legs whose green larvae can completely defoliate mountain ash (rowan) trees. Larvae have dark heads and feed gregariously.
Did You Know?
Introduced to North America in the early 1900s, it quickly became the most damaging pest of ornamental mountain ash trees across the continent.
How to Identify Mountain Ash Sawfly
Mountain Ash Sawfly (Pristiphora geniculata) belongs to the order Hymenoptera, family Tenthredinidae. Adults typically measure 5-7 mm.
Mountain Ash Sawfly Habitat
Mountain Ash Sawfly is found in mountains habitats, particularly across Europe, introduced to North America. This species has adapted to thrive in its preferred environment, where it can find suitable food sources and shelter.
Mountain Ash Sawfly Diet and Feeding
Mountain Ash 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 Mountain Ash Sawfly Found?
Mountain Ash Sawfly can be found in Europe, introduced to North America, where it inhabits mountains environments. Its distribution is influenced by climate, food availability, and habitat suitability.
Distribution Map
Where Mountain Ash Sawfly can be found
Is Mountain Ash Sawfly Dangerous?
Mountain Ash 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.
Mountain Ash Sawfly Role in Nature
Mountain Ash 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 Mountain Ash Sawfly
What does Mountain Ash Sawfly look like?
The Mountain Ash Sawfly typically measures 5-7 mm.
Where is Mountain Ash Sawfly found?
The Mountain Ash Sawfly is found in Europe, introduced to North America and typically inhabits mountains environments.
What does Mountain Ash Sawfly eat?
The Mountain Ash Sawfly feeds on plant material including leaves, stems, and other vegetation.
Is Mountain Ash Sawfly dangerous to humans?
The Mountain Ash 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 Mountain Ash Sawfly?
Introduced to North America in the early 1900s, it quickly became the most damaging pest of ornamental mountain ash trees across the continent.
Cite This Page
APA:
InsectDiscover. (2026). Mountain Ash Sawfly (Pristiphora geniculata). Retrieved from https://insectdiscover.com/insect/mountain-ash-sawfly
MLA:
"Mountain Ash Sawfly." InsectDiscover, https://insectdiscover.com/insect/mountain-ash-sawfly.