Article here:
https://cabiagbio.biomedcentral.com/articles/10.1186/s43170-023-00171-5

Summary:
https://phys.org/news/2023-08-citizen-science-natural-enemy-invasive.html

Dr. @matthewcock is the author/researcher that used iNat to monitor the distribution of a biocontrol agent in S/SE Asia and found it establishing in areas previously unreported where the host plant (Chromolaena odorata AKA Siam weed), a pioneering shrub from the Americas, has been one of the worst invasive plants in the Old World humid tropics and subtropics. Looking forward to this project yielding similar discoveries!

Relating host specificity testing to field risk for nontarget plants in
9 North American weed biocontrol organisms

Cryptostroma corticale (sooty bark disease):
https://ppo.puyallup.wsu.edu/sbd/

Rhinocyllus conicus ("nodding thistle receptacle weevil"):
https://www2.gov.bc.ca/assets/gov/farming-natural-resources-and-industry/forestry/agents/rhinocyllus_conicus.pdf
Impacted locally indigenous species:
Cirsium brevistylum:
Cirsium remotifolium: https://www.inaturalist.org/observations/122908498
Cirsium undulatum: https://www.inaturalist.org/observations/122748651

Example of a mutualistic interaction between two parasites (weevil & rust fungus) of Cirsium arvense (creeping/Canada thistle):
https://www.researchgate.net/publication/226968359_Mutualistic_interaction_between_a_weevil_and_a_rust_fungus_two_parasites_of_the_weed_Cirsium_arvense

Phragmidium violaceum (Rubus Rust):
https://www.plantmanagementnetwork.org/pub/php/brief/2005/blackberry/Pviolaceum.pdf
https://www.cambridge.org/core/journals/invasive-plant-science-and-management/article/invasive-blackberry-species-in-oregon-their-identity-and-susceptibility-to-rust-disease-and-the-implications-for-biological-control/3557705EAAB69DA1E3B121B90953CA2F

Bruchidius villosus (Broom Seed Beetle):
http://bugwoodcloud.org/ibiocontrol/proceedings/pdf/12_516-520.pdf
Off target impacts in New Zealand:
https://researcharchive.lincoln.ac.nz/bitstream/handle/10182/492/host-range_expansion.pdf?sequence=1&isAllowed=y

Exapion fuscirostre (Scotch broom seed weevil):
http://invasives.wsu.edu/biological/exapionfuscirostre.htm

Hylobius transversovittatus:
http://invasives.wsu.edu/biological/hylobiustransversovittatus.htm
https://www.ars.usda.gov/ARSUserFiles/21251/HOST%20SPECIFICITY%20AND%20ENVIRONMENTAL%20IMPACT%20OF%20THE%20WEEVIL%202.pdf

Mecinus janthinus:
https://fieldguide.mt.gov/speciesDetail.aspx?elcode=IICOLQD9R0

Cyphocleonus achates:
http://invasives.wsu.edu/biological/cyphocleonusachates.htm
https://www.youtube.com/watch?v=KRA_IaKKkJ8

Agapeta zoegana:
https://core.ac.uk/download/pdf/85212194.pdf
http://invasives.wsu.edu/biological/agapetazoegana.htm

Larinus minutus (lesser knapweed flower weevil):
https://academic.oup.com/ee/article/45/3/658/2962248

Larinus carlinae (Larinus planus):
https://lux.lawrence.edu/cgi/viewcontent.cgi?article=1112&context=luhp

Mecinus janthiniformis (dalmatian toadflax stem-boring weevil):
https://fieldguide.mt.gov/speciesDetail.aspx?elcode=IICOLQDAA0

Mecinus janthinus (toadflax stem weevil):

Mogulones crucifer (hound's-tongue weevil):
https://www2.gov.bc.ca/assets/gov/farming-natural-resources-and-industry/forestry/agents/mogulones_crucifer.pdf

Cryptostroma corticale (sooty bark disease):
https://dnrtreelink.wordpress.com/2021/06/09/sooty-bark-disease-appears-on-maples-in-seattle/
https://ppo.puyallup.wsu.edu/sbd/

Larinus obtusus (blunt knapweed flower weevil):

Aphyllon purpureum (indigenous parasitic wildflower):
https://www.inaturalist.org/observations?verifiable=any&place_id=any&field:Interaction-%3EParasite%20of=77255

Claviceps on Phragmites:
https://www.researchgate.net/publication/318402614_Claviceps_arundinis_identification_and_its_role_in_the_die-back_syndrome_of_Phragmites_australis_populations_in_central_Italy

Urophora stylata (bull thistle gall fly):

Platyptilia carduidactylus (artichoke plume moth):

Indigenous thistles impacted:
Cirsium brevistylum:

Tyria jacobaeae (Cinnabar moth):

Botanophila seneciella (ragwort seed head fly):

Longitarsus jacobaeae (ragwort flea beetle):

Aceria genistae (broom gall mite):
http://www.canacoll.org/Arach/Staff/Knee/pdfs/Pratt%20et%20al.%202019.pdf

Agonopterix alstroemeriana (poison hemlock moth):
https://academic.oup.com/ee/article/35/3/607/379045

Aceria chondrillae (rush skeletonweed gall mite and other rush skeleton weed biocontrols):
https://bugwoodcloud.org/resource/files/25241.pdf

Exapion ulicis (gorse seed weevil):

Bangasternus fausti (seed-feeding weevil):

Puccinia lapsanae (nipplewort rust):