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9th Annual Invasive Species Mapping Challenge

During the month of July, we challenge you to submit reports to iMap for our selected focal species to help fill data gaps and compete to win!


Learn about the selected species by joining our webinar, or viewing the info below.


Throughout July - go outside and check for the selected species you're most interested in.


Report back to iMap - whether you find it or not!

The observers with the most records (including not-detected reports!) for each species will win a prize! You might even help win a trophy for your PRISM!

Meet the species

Click the icons below each species picture for the following resources 

Quick video on identifying the species

Map of the currently known distribution

A link to more info on the species

Jumping Worm
Amynthas-Metaphire spp.
European Frog-bit
Hydrocharis morsus-ranae
Ailanthus Altissima
Beech Leaf Disease
Litylenchus crenatae mccanii
Water Chestnut
Trapa natans
Nasturtium officinale

Search for these species and report Presence and Not-detected records to iMapInvasives! View our quick setup playlist.

*** The challenge includes Not-Detected Records! ***

Searching for these species but can't find them in your area? Make sure you are checking the correct habitat, and record in iMap that you searched for the species but did not find it (select "not-detected" in the mobile app). Be sure to enter the number of minutes you spent looking around in "time searched"!

Jumping Worm
Beech Leaf Disease
European Frogbit, Water chestnut, and Watercress

Found on the soil surface and leaf litter - Lawns, gardens, forest understories, etc.

Disturbed areas - roadsides, forest edges and openings, urban areas, parking lots, etc.

To check for BLD, you have to find a Beech tree, common in many NY forests

Slow-moving or stagnant water (lakes, ponds, rivers, and streams)

2023 Challenge Results


Thank you to all who participated in 2023! We received over 1,000 records, with points in all eight PRISMs!

Note: the total observations for each species by PRISM and observer are based on the number of unique populations reported (defined as records 100m or more apart, like the species tiers analysis), rather than raw record numbers. Confirmed presence records and not-detected records were considered.

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