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20 Cards in this Set
- Front
- Back
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Why do we need TRA? |
-Urbanization -BC provincial parks -BC forestry |
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What is risk? |
Probability an undesirable event will happen Quantifiable (can estimate the probability of occurrence) |
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What is Tree Risk? |
The probability of a tree (or some part of it) failing. |
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What do you look at during a TRA? |
-visual tree assessment (examine the tree in detail considering root system and check stem for hollowness) -Detailed tree assessment ) climbing, root excavation, resistograph readings on stem or large roots) |
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describe the procedure of TRA (ISA style) |
-Assess probability of failure -Assign rank value -Add up 3 ranks -Reccomend an appropriate action |
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What is meant by Basic Tree Cost? |
Replacement cost of a tree. |
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What is meant by species rating %? |
Subjective rating based on individual qualities. |
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What is meant by Condition rating %? |
Overall health and structural integrity of the tree. |
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What is meant by Location Rating %? |
Trees placement in the landscape. |
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What are four examples of recommendations that you can make after assessing a tree for risk? |
-Remove tree -Manage the area -Modify tree -Combination of above |
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What are some things that allow an invasive species to be successful? |
-Climate -Lack of predators -Large introduced population -Reproductive output -Host plant -Growth pattern |
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How much do invasives cost per year in US? |
$137 billion |
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How many non-native forest insects are there in the US? |
455 |
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How many forest pests are there in Canada? |
181 |
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What are some Urban impacts of pests? |
-lowers property value -tree replacement costs -increases AC costs -Allergies (gypsy moth) |
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What are some City impacts of pests? |
-Hazard trees -Tree removal/costs -Tree replacement costs -Increased public calls -Budget adjustments, triage |
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What are some pathways into Canada for pests? |
-Infested wood packaging material -Christmas ornaments |
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What are some survey methods for asian gypsy moth? |
-Visual -Aerial -light trapping -Trap trees/logs -Semiochemical traps |
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What three things are required for i-tree streets? |
-Tree ID (Unique identifying number) -DBH -Street segment |
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What 3 things can i-tree streets calculate? |
-Structure -Function -Value |
