Invasive SpeciesGalerucella beetle

Not Yet Reviewed by Expert
Quality checked by joan
Peer reviewed by joan
Field Notes
big urban area 18 meters by 14 meters under the "Million Dollar Bridge". Looking for Galerucella beetle introduced to control Purple Loosestrife, an invasive species to Maine.
Supporting Evidence
Photo of my evidence.
Herbivory, insect munching evidence, is evident on this leaf, but I did not see the beetle itself.
Photo of my evidence.
The only evidence of insects I found included a bumble working on the flower buds of the Purple Loosestrife.
Photo of my evidence.
If you had incredible observation you might find the ant also amongst the Purple Loosestrife. Again, NO BEETLES at all in the quadrat area.
Species Observation: Species Looked For
Did you find it?: 
I think I did not find it
Scientific name:
Common name:
Galerucella beetle
Sampling method: 
Quadrat (user-placement)
Photo of our sampling method.
Place Studied
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Map this species
N 43.647390 °
W -70.260810 °
Observation Site Information
A photo of our study site.
Upland - Developed areas
Trip Information
Under the Bridge, Commercial Street
Trip date: 
Fri, 2014-08-22 10:00
Town or city: 
Type of investigation: 
Species and Habitat Survey
Habitat Observations
Species diversity: 
9 different species
Evidence of vectors: 
Galerucella beetles would likely follow the food, the Purple Loosestrife.
Tree canopy cover: 
Soil moisture: 


Hello Joan (and Moss Boss). I am focused on those holes in the leaves too. Joan, you may have uncovered some evidence that Galerucella may in fact be in the neighborhood. Very interesting. My students and I have been studying the loosestrife/Galerucella relationship for several years, since we found both of them on our school campus. We have been monitoring the relationship ever since and will be revisiting the campus site with a new group of kids soon. See our mission link below.

As a class we have been wondering how Galerucella, a non native used as a biocontrol ended up on our school campus. We were also wondering where else Galerucella might be.

It is a lot easier to see Galerucella beetles in May, when they reemerge from their hibernation to feed and lay eggs.

I was wondering if you noticed any Japanese beetles on the flowers of the loosestrife you looked at? This time of year our plant's flowers seem to get devoured by Japanese beetles.

Our preliminary findings is that the one, two punch of beetles (Galerucella and Japanese beetles) seem to have been keeping our loosestrife from spreading on our campus. Wondering if this is happening elsewhere. Thanks for looking and finding (I think).

I wonder if those "bullet hole" shaped bite holes will be enough for the species expert to make an ID from. I've heard that's a characteristic of the galerucella beetles. Nice data!

Cheers and happy observing,