Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Plant diseases > Sunflower diseases > Flashcards

Sunflower diseases Flashcards

1
Q

major sunflower diseases

A

sclerotinia wilt, head rot, mid stem, verticillium wilt, rust, downy mildew, stem lesions, leaf spots

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Sclerotinia Wilt in Sunflower

A

most common
very destructive
sclerotinia in soil
complete wilt by flowering

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Sclerotinia

A

germination of apothecia
release if ascospores infect head and stem
Mycelia infect roots and stems at soil

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Sclerotinia head rot sunflower

A 
in soil
wet soil
complete collapse of head
ascospores infect head
late infection 
mycelia cover head
seed infected by fungus
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Sclerotini Mid stem Sunflower

A 
in soil
apothecia, sacos-ores, infect stem
stem shredding
stem breakage
inside the stem 
total yield loss
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

control of sclerotinia in sunflower

A 
crop rotation 3-4 years
avoid dense canopy
control weeds
seed treatment for wilt
foliar fungicides for head
biological control
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Sunflower Rust

Symptoms

A

Fungal disease, only sunflower
very destructive

yellow brown pustules
black teliospores
overwinter locally on stubble
Orange coloured and dark brown

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Management of rust sunflowers

A

resistant hybirds
3 year crop rotation
remove infected stubble
clean seed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Downy Mildew Sunflowers

A 
Caused by oomycete
fungal- soil/seed borne
oospores survive in soil
zoospores move in wet soil
seedling infection
total loss of infected plants
there are resistant races
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Control of downy mildew sunflowers

A

reistant hybrids
crop rotation 4-5 years
clean healthy seed
sed treatment

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Verticillium Wilt leaf mottle sunflowers

A 
fungal disease- same as potatoes
soil borne
infect roots
systemic disease
lower leaves wilt
microsclerotinia like for greater the 10 years 
overwinters in soil
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

verticillium wilt leaf mottling sunflowers CONTROL

A

resistant hybrids
5 year crop rotation
disease free seed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Stem lesions sunflowers

A 
fungal diseaase
infect lower leaves and stem 
black lesions on leaf axil 
grey brown stem colour 
hollow stem
overwinters in plant debris
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

stem lesion control

A

resistant hybrids
crop rotation
remove plant reside

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Powdery mildew

A

fungal disease
infect faces stem ends
explosive new races
whitish mycelial mass

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Seedling blight/ damping off sunflower

A

light brown to red lesions on roots
seedling turn yellow
may be due to other pathogens

17
Q

Seedling blight/ damping off sunflower control

A

seed treatment
crop rotation
resistant cultivars
firm seed bed

18
Q

Aster yellows

Control-

A 
casual agent of phytoplasma
flower deformation
flower buds convert to vegetive
Sterile flowers
reduced yield
carrier- leaf hopper

Control- tolerant hybrid
early seeding

Plant diseases (8 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions