Trees & tree care
Tree identification resources by country
Where each country's government, university, herbarium and charity sites help you put a name to a tree.
Tree ID, pests and diseases
Identifying trees, the pests and diseases that regulators track, where each is regulated, and who to report a sighting to.
194 pages in this topic. Each guide names its sources and the date they were read.
Tree identification
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Trees & tree care
Tree species: what the forestry agencies record
One page per species of the most planted and most worked North American trees, built from the Silvics of North America, the Wood Handbook, the NRS-38 weight table and the USDA PLANTS Database, with a comparison table of names, range and green weight.
Invasive insects
Trees & tree care
Asian longhorned beetle: where it is regulated, country by country
What the agencies in the United States, Canada and the United Kingdom say about Asian longhorned beetle rules, which counties are listed, what wood is covered, and the date on each page.
Trees & tree care
Box tree moth: where it is regulated in the United States and Canada
What USDA APHIS and the Canadian Food Inspection Agency say about box tree moth rules, which states and provinces are listed, what boxwood material is covered, and the date on each page.
Trees & tree care
Insect pests of trees: what the agencies record
A table of the tree insect pests that agencies and extension services in the United States, Canada, the United Kingdom and Australia describe: which trees they are recorded on, where, whether an agency calls them regulated or notifiable, and where reports go.
Trees & tree care
Spongy moth: where it is regulated, country by country
What the agencies in the United States, Canada and the United Kingdom say about spongy moth rules, which items and areas they cover, and the date on each page.
Trees & tree care
Tree pests and diseases to know, country by country
Tree crews are often the first people to see a regulated pest on a job.
Emerald ash borer and ash decline
Trees & tree care
Ash dieback: how it is regulated across the United Kingdom
What the Forestry Commission, Scottish Forestry, Northern Ireland's agriculture department and Forest Research say about ash dieback rules: status, tree felling, imports and notices.
Trees & tree care
Emerald ash borer: where it is regulated, country by country
What the agencies in the United States, Canada and the United Kingdom say about emerald ash borer rules, what each rule covers, and the date on each agency page.
Oak and elm diseases
Trees & tree care
Oak wilt: what each state and province agency says about pruning months
Agency pages in Wisconsin, Minnesota, Michigan, Iowa, Missouri, South Dakota, Pennsylvania, New York, Texas, Ontario and the Canadian Food Inspection Agency, plus a Nebraska extension update, with whether each reports oak wilt and the months it advises against pruning or wounding oaks.
Trees & tree care
Tree diseases: what the agencies record
A table of the tree diseases whose agency pages we have read: the pathogen, the main hosts, the countries that report it, the status the agency gives it, and where to send a report.
Ash dieback and UK/EU pests and diseases
Trees & tree care
Ash dieback: how it is regulated across the United Kingdom
What the Forestry Commission, Scottish Forestry, Northern Ireland's agriculture department and Forest Research say about ash dieback rules: status, tree felling, imports and notices.
Trees & tree care
Oak processionary moth: how it is regulated in Great Britain, zone by zone
What the Forestry Commission and Forest Research say about oak processionary moth: its quarantine status, the management zones in England, and what each zone means for moving oak trees.
Insect pests of shade trees and conifers
Trees & tree care
Insect pests of trees: what the agencies record
A table of the tree insect pests that agencies and extension services in the United States, Canada, the United Kingdom and Australia describe: which trees they are recorded on, where, whether an agency calls them regulated or notifiable, and where reports go.
Leaf, canker and root diseases
Trees & tree care
Tree diseases: what the agencies record
A table of the tree diseases whose agency pages we have read: the pathogen, the main hosts, the countries that report it, the status the agency gives it, and where to send a report.
Trees & tree care
Tree pests and diseases to know, country by country
Tree crews are often the first people to see a regulated pest on a job.
Fungi and mushrooms
Trees & tree care
Wood decay fungi on trees: what the sources record
A comparison of the wood decay fungi that tree-care and forestry sources describe: the rot each causes, the hosts, where the fruiting body shows, and what the sources say a conk can indicate.
Biosecurity
Trees & tree care
Asian longhorned beetle: where it is regulated, country by country
What the agencies in the United States, Canada and the United Kingdom say about Asian longhorned beetle rules, which counties are listed, what wood is covered, and the date on each page.
Trees & tree care
Biosecurity pages side by side: what each agency lists for tools, chips and wood, pest by pest
What the official pages for kauri dieback, shot-hole borer, ramorum, oak processionary moth, ash dieback and five other tree pests list on cleaning tools and boots, handling chips and arisings, and moving wood, with the source for each row.
Trees & tree care
Box tree moth: where it is regulated in the United States and Canada
What USDA APHIS and the Canadian Food Inspection Agency say about box tree moth rules, which states and provinces are listed, what boxwood material is covered, and the date on each page.
Trees & tree care
Emerald ash borer: where it is regulated, country by country
What the agencies in the United States, Canada and the United Kingdom say about emerald ash borer rules, what each rule covers, and the date on each agency page.
Law & permits
Moving wood: firewood, chip and quarantine rules
Cut wood, logs, brush and chip can carry pests.
Trees & tree care
Oak processionary moth: how it is regulated in Great Britain, zone by zone
What the Forestry Commission and Forest Research say about oak processionary moth: its quarantine status, the management zones in England, and what each zone means for moving oak trees.
Trees & tree care
Report a tree pest or disease in Australia: the Exotic Plant Pest Hotline and state agencies
Who Plant Health Australia and the state agencies say takes a report of a suspected plant pest or disease, the phone lines and forms they publish, what they ask a reporter to include, and the pests they name.
Trees & tree care
Report a tree pest or disease in Canada: who the agency names
Who the Canadian Food Inspection Agency says takes a report of a suspected tree pest or disease, the phone line and online form it publishes, what it asks a reporter to include, and the pests its pages name.
Trees & tree care
Report a tree pest or disease in Ireland: TreeCheck and the Department of Agriculture
Who the Irish Department of Agriculture, Food and the Marine says takes a report of a suspected tree pest or disease, the phone lines and the TreeCheck tool it publishes, and what the pages name.
Trees & tree care
Report a tree pest or disease in New Zealand: kauri dieback, myrtle rust and who takes the call
Who Tiakina Kauri and the Department of Conservation say takes a report of sick kauri or myrtle rust, the phone lines and forms they publish, what they ask a reporter to include, and the diseases they name.
Trees & tree care
Report a tree pest or disease in the United Kingdom: TreeAlert, TreeCheck and the plant health offices
Who the United Kingdom agencies say takes a report of a suspected tree pest or disease, the online tools and phone lines they publish, what they ask a reporter to include, and the pests they name.
Trees & tree care
Report a tree pest or disease in the United States: who the agencies name
Who the United States agencies say takes a report of a suspected tree pest or disease, the phone lines and forms they publish, what they ask a reporter to include, and the pests their pages name.
Trees & tree care
Spongy moth: where it is regulated, country by country
What the agencies in the United States, Canada and the United Kingdom say about spongy moth rules, which items and areas they cover, and the date on each page.
Directory
Plant disease and insect diagnostic labs in the United States
The state plant diagnostic labs, each linked to its own page.
Tree ages and odd growth
Trees & tree care
Odd tree growth: witches' brooms, burls and fused trunks
Dense tangles of shoots, swollen trunks and trees that have grown into each other draw questions on every job.
Tool
Tree age estimate calculator
Type a trunk diameter and pick a species to see the diameter times the growth factor from a published table, which gives an estimated age in years.
Things growing on trees
Trees & tree care
Things growing on trees: ivy, mistletoe, lichen and moss
Ivy, mistletoe, lichen and moss all grow on bark or branches, but they work in very different ways.
Trees & tree care
Tree galls: what extension services describe
Galls are odd lumps, bumps and swellings on leaves, twigs and roots, most often made by wasps, midges, mites, aphids or psyllids.
Wildlife and other damage
Trees & tree care
Wildlife damage to trees: what extension services describe
Deer, rabbits, voles, beavers, woodpeckers, squirrels, porcupines, livestock and moles each leave a different mark on trees.