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Unit 4 Forest Enemies

True/False
Indicate whether the statement is true or false.
 

 1. 

Trees have adapted to grow best in certain climates and under certain conditions.
 

 2. 

Forest enemies include anything that interferes with the normal reproduction and growth of forest trees.
 

 3. 

Disease kills more trees than any other forest enemy.
 

 4. 

The bark beetle can tunnel completely around a tree, girdling it.
 

 5. 

Insects in the sod may feed on tree roots.
 

 6. 

Trees that have been damaged are susceptible to insect attack.
 

 7. 

When trees are too crowded, they are more subject to insect and disease problems than healthy trees.
 

 8. 

Fungus diseases attack the leaves, stems, or roots of a tree.
 

 9. 

Damaged trees are less subject to disease.
 

 10. 

When wildlife populations increase, damage to the forest can result.
 

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

When a tree is ____, it can no longer send food from the leaves to the roots.
A.
sprayed
C.
wrapped
B.
girdled
D.
staked
 

 2. 

____ insects damage trees by feeding on the leaves or needles.
A.
Seed-eating
C.
Gall
B.
Wood-boring
D.
Defoliating
 

 3. 

____ insects eat their way through the sapwood and heartwood of a tree.
A.
Seed-eating
C.
Wood-boring
B.
Gall
D.
Defoliating
 

 4. 

Sapsuckers usually only ____ trees and slow their growth.
A.
weaken
B.
kill
 

 5. 

____ live by eating tree nuts, fruits, and seeds.
A.
Wood-boring insects
C.
Galls
B.
Defoliators
D.
Seed-eating insects
 

 6. 

Whenever foresters alter natural controls, we say they are using ____ insect controls.
A.
natural
C.
chemical
B.
biological
D.
standard
 

 7. 

A ____ is any disease-causing organism.
A.
bacteria
C.
pathogen
B.
bug
D.
fungus
 

 8. 

____ can provide a quick and effective short-term solution.
A.
Chemicals
B.
Natural methods
 

 9. 

Noninfectious diseases are usually caused by ____ problems.
A.
parasite
B.
environmental
 

 10. 

Fungi reproduce and spread by tiny ____.
A.
spores
B.
seeds
 

Matching
 
 
Match the question with the correct response
A.
pathogen
F.
tip feeders
B.
long term
G.
snows
C.
parasites
H.
management
D.
hunting
I.
insecticide
E.
galls
J.
pathology
 

 1. 

Insects that attack young twigs, stems, or buds
 

 2. 

Abnormal growth
 

 3. 

Any disease-causing organism
 

 4. 

The study of tree diseases
 

 5. 

Organisms that rely on other organisms
 

 6. 

Most effective control of forest diseases
 

 7. 

Often effective in preventing insect spread
 

 8. 

Breaks limbs and even whole trees
 

 9. 

Damage due to overgrazing
 

 10. 

Best solution to too great wildlife populations
 



 
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