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Phone: +1.217.355.9411
Fax: +1.217.355.9516

Mailing Address

International Society of Arboriculture
PO Box 3129
Champaign, IL 61826-3129
United States

Physical Address

International Society of Arboriculture
2101 West Park Court
Champaign, IL 61821
United States

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  • ISA Headquarters will be closed 24 December through 4 January for the holiday season. Any orders received after 2:00pm CST on 20 December will not ship until 7 January.

Online CEU Quizzes

Click here for online quiz tutorial.

TitleCEUsPrice

Ken and Rip discuss cuts a climber can use in a tree with a chain saw. The quiz covers the episodes Mismatch Cut & Drop Cut and Hinge Cut & Lifting Cut. (A,T,L,Bp)


0.5 CEU
ISA Members: $4.95
Retail Price: $6.49
All prices in US Dollars

Apple and pear scab caused by the fungal pathogens Venturia inaequalis and V. pirina can be devastating to apples (Malus spp.) and pears (Pyrus spp). This article details two UK field trials that assessed the efficacy of alternatives to the synthetic fungicides frequently used in fruit production, including a range of silicon fertilizers, a resistance-inducing (IR) agent, and a combination of Si + IR. (A,Bs)


1 CEU
ISA Members: $0.00
Retail Price: $12.95
All prices in US Dollars

Dendro and Codit visit Ontario, Canada to weigh in on the potential protection status of a lone Butternut standing in the way of retail development. This beautiful specimen may not be protected for a number of reasons. Will it be spared? (Original story by James Komen and Nick Miele) (A,M,Bm)


1 CEU
ISA Members: $9.95
Retail Price: $12.95
All prices in US Dollars

This second article on nursery production systems discusses the potential influence of production methods on root architecture and growth, pest and disease susceptibility, establishment, drought tolerance, and tree survivability. (A,M,Bs)


1 CEU
ISA Members: $0.00
Retail Price: $12.95
All prices in US Dollars

Rip and Ken discuss basic chain saw safety while in a tree. The accompanying quiz covers this episode plus the episodes Making a Felling Plan, Working the Felling Plan, Felling with Forward Lean, Limbing, and Bucking (A,T,L,Bp).


1 CEU
ISA Members: $9.95
Retail Price: $12.95
All prices in US Dollars

This Best Practices Podcast quiz covers Selecting Nursery Stock (Part 1 and Part 2), Tree Planting (Part 1 and Part 2), Mulch Ring, and Staking a Tree. (A,M,Bp)


1 CEU
ISA Members: $9.95
Retail Price: $12.95
All prices in US Dollars

While the industry-standard black plastic container has many advantages in woody plant production, circling and girdling roots on plants grown in them can lead to a variety of post-transplant problems. Plants grown in fabric containers may have fewer circling and girdling roots, potentially eliminating some transplant problems. This study evaluated post-transplant root and shoot growth of Pyrus calleryana ‘Glen’s Form’ (Chanticleer®) produced using three container types. (A,Bs)


1 CEU
ISA Members: $0.00
Retail Price: $12.95
All prices in US Dollars

What are the effects of pruning on mature trees? Linda Chalker-Scott presents the current state of science on the physiology of aging trees, which can be used to predict the impacts of conventional and retrenchment pruning on tree health. (A,M,T,L,Bs)


1 CEU
ISA Members: $9.95
Retail Price: $12.95
All prices in US Dollars

This month’s Best Practices podcast focuses on an often forgotten area of tree inspection; the root crown. A simple root crown excavation can reveal a wealth of potential problems, and when done and mulched, provide a needed safety buffer zone around the tree. The available quiz covers this episode, plus the previous episodes of Personal Protective Equipment (PPE), Setting up a TPZ, Soil Texture, Measuring DBH, and Chainsaw Safety Features. (1 CEU-A,M,Bp)(.5 CEU-T,L)


1 CEU
ISA Members: $9.95
Retail Price: $12.95
All prices in US Dollars

Complete Set of CEU Articles - Contains 95.75 CEUs. These collections of CEU Articles are designed to advance your arboricultural education, whether you are reviewing a specific concept or wishing to improve your general knowledge of arboriculture. A compilation of previously published CEU articles sorted into ten major categories. Purchasing this online product gives you access to an electronic, printable version of each article, as well as an online CEU quiz. The articles and CEU quizzes can be viewed on your desktop, laptop, tablet, or smart phone. Make sure you're logged-in to the ISA website to check if you've previously purchased these quizzes.


95.75 CEU
ISA Members: $239.95
Retail Price: $279.95
All prices in US Dollars

This book is a compilation of previously published CEU articles. The articles were thematically selected to improve arborists' understanding tree science including classifications of conifers and yews; plant traits that resemble abiotic disorders; identifying wood decay and wood decay fungi in urban trees; and American Mistletoe; kissing under a parasite. (13.25 A,U,T,M,L,Bs) Make sure you're logged-in to the ISA website to check if you've previously purchased these quizzes.


13.25 CEU
ISA Members: $44.95
Retail Price: $54.95
All prices in US Dollars

This book is a compilation of previously published CEU articles. The articles were thematically selected to improve arborists' understanding of urban forestry, including tree inventories, tree risk assessment and managing trees during construction. (12 A,U,T,M,L, 9 Bm, 2 Bp, 1 Bs) Make sure you're logged-in to the ISA website to check if you've previously purchased these quizzes.


12 CEU
ISA Members: $44.95
Retail Price: $54.95
All prices in US Dollars
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