CATS Cheat Sheet 2026

The 30 highest-yield CATS facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. Which of the following pruning practices is explicitly forbidden under ANSI A300 standards? → Leaving a flush cut by removing the branch collar
2. Which factor is most important when assessing tree stability? → Structural defects and root integrity
3. What is the purpose of constructing a watering berm around a newly planted tree? → To direct and concentrate irrigation water to the root zone
4. Before planting near Albuquerque sidewalks, which factor should be evaluated to prevent infrastructure damage? → The species' root architecture and surface root growth potential
5. Which of the following is a common indicator of internal wood decay in a standing tree? → Fruiting bodies (conks or mushrooms) growing on the trunk
6. What does the N-P-K ratio on a fertilizer label represent? → Nitrogen, Phosphorus, Potassium percentages by weight
7. Which pruning technique is best for reducing the overall size of a tree while maintaining its natural shape? → Crown reduction
8. Which fertilizer application method places nutrients directly into the root zone and is most effective for trees in compacted urban soils? → Deep root liquid injection
9. What does the term 'target' refer to in tree risk assessment? → A person, structure, or area that could be struck by a failing tree or branch
10. Which environmental factor increases tree failure risk? → High winds and saturated soil conditions
11. Which of the following tree tissues is a lateral meristem responsible for secondary growth, which results in the thickening of the trunk and branches? → Cambium
12. Which pest is known to cause significant damage to ash trees? → Emerald ash borer
13. What is a 'pick-off rescue' in tree climbing? → A second climber ascends to the stricken climber and assists or lowers them to the ground
14. What is a common sign of fungal infection in trees? → Cankers and fungal fruiting bodies
15. What is the function of mycorrhizal fungi in relation to tree nutrition? → They extend the effective root surface area to enhance water and nutrient uptake
16. What does 'work positioning' mean in aerial tree work? → Using the climbing system to support body weight so both hands are free for tools
17. How do trees help mitigate climate change? → They absorb carbon dioxide and reduce greenhouse gases
18. Why is proper tree maintenance essential in urban forestry? → To extend tree lifespan and ensure public safety
19. Which component of a complete soil test is most important for determining lime or sulfur amendment rates for trees in New Mexico? → Soil pH and buffer pH
20. When conducting a foliar nutrient spray for iron deficiency in Albuquerque, which iron chelate formulation performs best in high-pH soils? → FeEDDHA
21. How can soil health impact tree disease resistance? → Supports strong root growth and resistance
22. What rescue equipment must be on site during every aerial tree operation? → A second climbing system, a descent device, and first aid supplies including a trauma kit
23. Why is it important to remove dead or diseased branches? → Prevents disease spread and enhances safety
24. Why is urban forestry important in city environments? → It improves air quality and reduces heat islands
25. What is the general establishment period for a 2-inch caliper tree planted in New Mexico's climate? → Approximately one year per inch of trunk diameter
26. Which mulching practice best supports newly planted tree establishment in Albuquerque's dry climate? → A 3-4 inch deep mulch ring to the drip line, kept away from the trunk
27. What is the primary cause of root rot in trees? → Excess moisture and fungal infection
28. Why should pruning cuts be made just outside the branch collar? → To promote healing and reduce decay risk
29. Why is it recommended to remove wire baskets and burlap from rootballs during planting? → They restrict root expansion and can girdle developing roots
30. Which of the following characteristics is most useful for distinguishing Juniperus monosperma (One-seed Juniper) from other juniper species in New Mexico? → Berry-like cones containing a single seed