Master Gardener Handbook Quiz on Chapter 8: Plant
Pathology
Questions
1) Plant diseases are caused only by pathogens.
True_________
False_____
2) Examples of inoculum include (choose the incorrect
answer):
a) fungal spores
b) fungal mycelium
c) nematode eggs
d) nutrient deficiencies
3) The three components of the disease triangle are a
plant, a pathogen, and the ___________.
4) Fungi need to draw their sustenance from other living
things because they lack chlorophyll.
True________
False_____
5) Both the smut and the _______ fungi cause some of
the most destructive crop diseases known.
6) Southern blight has these characteristics (choose the
incorrect answer):
a) It is caused by a fungus.
b) It is active only during the early spring.
c) The first symptoms are the wilting or collapse of stems
or the entire plant.
d) It can blight most herbaceous perennials.
7) _________ is the most important fungal disease of
roses worldwide.
Revised for 2012
8) Dutch elm disease enters through feeding wounds
made by termites.
True_____
False_____
9) Dogwood ___________ is the most serious disease of
dogwoods in the landscape and in forests.
10)
The optimum conditions for powdery mildew are
cool days followed by cooler nights.
True______
False______
11)
Bacteria have the following characteristics (choose
the incorrect answer).
a) Almost all plant bacteria are cone shaped.
b) Bacteria reproduce by splitting into two equal halves.
c) Bacteria invade plants through wounds and natural
openings.
d) In some cases, bacteria can survive in the soil.
12) A serious bacterial disease of plants in the rose family
is ______ ________.
13) Nematodes either burrow into tissues and feed
internally or feed from the surface of plant tissues.
True______
False_____
14) Most plant viruses cause ________ infections, and there
is no cure for infected plants.
15) Homeowners can use chemical controls to kill
nematodes.
True_____
False_____
(Answers on next page)
Revised for 2012
Master Gardener Handbook Quiz on Chapter 8
Answers
Page in Handbook
1) False (Nonliving factors can
also cause disease.)
115
2) d. nutrient deficiencies
115
3) environment
116
4) True
116
5) rust
118
6) b. (active only in hot weather)
118
7) Blackspot
119
8) False (elm bark beetles)
120
9) anthracnose
120
10) False (warm days)
121
11) a. rod shaped
122
12) fire blight
123
13) True
124
14) systemic
125
15) False (No nematicides are
registered to homeowners.)
128
Revised for 2012