Tree Pest & Disease Tracking Data
TreeIssues tracks active tree pests, diseases, and invasive species across the United States, aggregating data from federal and state agencies and updating continuously. Key figures below, free to cite with attribution to TreeIssues.
Last updated October 2, 2026
3867
Pests & diseases tracked
51
States with active alerts
50
Host tree species
11413
Treatments documented
99%
Backed by a cited source
129
Published articles
By category
Insect2605
Fungus1173
Other79
Disease10
By severity
CRITICAL7
HIGH14
MODERATE3843
LOW3
How we source this data
Entries are compiled and continuously updated from authoritative sources, and 99% link to a primary source. Our data pipeline aggregates:
- • USDA APHIS pest and disease alerts
- • USDA Forest Service (USFS) reports
- • University cooperative extension services
- • iNaturalist research-grade observations
- • Community sightings, verified by ISA Certified Arborists
Reviewed by ISA Certified Arborists. Free to cite with attribution and a link to treeissues.com.