Summer Branch Drop Test

Summer Branch Drop Test
Please fill out your email address in the first box and your name, ISA cert. no. in the second box. Answer the questions below and when you are finished, press submit.

Email Address :
Name :

Question: 1. Seemingly healthy limbs occasionally break out of mature trees:
following hot calm summer afternoons.
following a heavy summer rain.
in irrigated and unirrigated landscapes.
all of the above.

Question: 2. Limb failure has been reported on:
Quercus lobata only.
Quercus species only.
species of 19 genera.
species of more than 50 genera.

Question: 3. Most commonly, breakage occurs how far from the branch attachment?
At the trunk.
3 to 14 feet.
Near the branch tip.
All of the above.

Question: 4. This phenomenon is confined to times of high temperature in:
Australia.
South Africa.
Southwestern United States.
all of the above.

Question: 5. After a break, water has been observed flowing from:
the tree.
the limb.
both sides of the fracture.
all of the above.

Question: 6. The xylem could be under pressure because:
wetwood bacteria have created gas pressures.
transpiration may be greatly increased due to high humidity.
root pressure decreases the moisture content of branches.
all of the above.

Question: 7. Branch drop can also occur because of:
reduced high humidity in the tree canopy.
the production of ethylene.
weakened cell wall cementation.
all of the above.

Question: 8. Precautions include:
warning people of potential hazard.
not planting species known to be susceptible.
keeping trees vigorous and healthy.
all of the above.

Question: 9. Species most often reported in Britain to be susceptible:
Cedrus spp.
Eucalyptus spp.
Salix spp.
all of the above.

Question: 10. Genera most often reported in California to be susceptible:
Salix.
Castanea.
Cedrus.
all of the above.

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