Online quiz #6 Flashcards
Which is an abiotic condition associated with drought conditions?
a) fire blight
b) pine wilt
c) verticillium wilt
d) scorch
d) scorch
Which disease is most commonly associated with shady conditions and poor air movement?
a) powdery mildew
b) thyronectria canker
c) black spot of rose
d) apple scab
a) powdery mildew
Which is caused by a nematode?
a) Dutch elm disease
b) crown gall
c) pine wilt
d) cedar apple rust
c) pine wilt
Which statement about fungicides is NOT true?
a) contact fungicides are not taken up by the plant
b) systemic fungicides typically give shorter control intervals than contact fungicides
c) fungi may become resistant to some systemic fungicides
d) timing of application is important if a fungicide is to be effective
b) systemic fungicides typically give shorter control intervals than contact fungicides
Chemical control is usually ineffective with which disease?
a) cankers
b) pine tip blight
c) black spot of rose
d) apple scab
a) cankers
The most common plant pathogens are:
a) bacteria
b) fungi
c) nematodes
d) viruses
b) fungi
To control cedar-apple rust, routine sprays on the apple/crabapple host must be applied during:
a) March and April
b) April and May
c) May and June
d) June and July
b) April and May
The most common foliar disease of roses in Kansas is:
a) anthracnose
b) black spot
c) dothistroma
d) fire blight
b) black spot
Which is NOT true of iron chlorosis?
a) It is a common problem of Pin Oak
b) leaves turn yellow, but the veins often remain green
c) It is more severe in low pH (acid) soils
d) It can be treated with a foliar iron spray
c) It is more severe in low pH (acid) soils
Scab fungus on apple and flowering crabapple overwinters…
a) under the trunk bark
b) on fallen leaves
c) on fallen fruit
d) on neighboring juniper trees
b) on fallen leaves
Above-ground symptoms of root disease may include: (choose ALL that apply) mycelial growth on foliage leaf yellowing wilting during stress branch and shoot dieback
leaf yellowing
wilting during stress
branch and shoot dieback
Dutch elm disease is spread by…. (choose ALL that apply)
a) wind-blown spores
b) root grafts
c) European elm bark beetle feeding
d) nematodes
b) root grafts
c) European elm bark beetle feeding
Which disease damages trees by killing bark tissue?
a) crown gall
b) fire blight
c) anthracnose
d) cankers
d) cankers
Which statements are true of fire blight? (choose ALL that apply)
a) It is caused by a virus
b) It affects new growth of young pine trees
c) The terminal end of a diseased shoot may develop a hooked end
d) Fungicides applied in spring give effective control
c) The terminal end of a diseased shoot may develop a hooked end
Which disease is caused by a virus?
a) rose mosaic
b) crown gall
c) anthracnose
d) verticillium wilt
a) rose mosaic
