Plant Diseases Flashcards
What is the impact of the
Tobacco mosaic virus on
plants? (Especially tobacco
and tomato plants)
Causes leaves to have
discoloured patterns on their
leaves that resemble mosaics.
Affects photosynthesis.
Virus survives easily unless
temperature rises above 40oC.
What are aphids?
Tiny insects found in large
numbers sucking the sap from
the stems of plants. They
reduce the rate at which the
plants grow, cause them to wilt
and make their leaves curl and
discolour.
Ladybirds are used to combat
aphids.
What type of disease is Rose black spot?
Fungal disease
What is the impact of Rose
black spot on roses?
Marks leaves for roses turning
them black or purple.
Plants ability to
photosynthesise reduced.
Heavily marked leaves die and
drop off.
How can you treat Rose black
spot disease?
Burn infected parts of plant.
Apply antifungal spray.
How would you go about
identifying a plant pathogen?
Refer to gardening manual or
website.
Take infected plant to a lab to
identify issue.
Use a testing kit that contains
monoclonal antibodies.
What are signs of plant
diseases?
Stunted growth
Spots on leaves/discolorations
Areas of decay/rot
Additional growths
Malformed stems or leaves
Presence of pests
Nitrate deficiency in plants
leads to….
Stunted growth as protein
synthesis cannot take place
Magnesium deficiency in
plants leads to….
Chlorosis. Plants are unable to
make chlorophyll
Give physical plant defence
responses to resist invasion of
pathogens.
Tough waxy cuticle on leaves. Strong cellulose cell walls. Layers of dead cells around stem (bark) which can fall off taking the pathogen with it.
Give chemical plant defence
responses to resist invasion of
pathogens.
Antibacterial chemicals
produced (e.g. mint, witch
hazel).
Poisons made to stop it being
eaten.
Give mechanical plant defence
responses to resist invasion of
pathogens.
Thorns.
Leaves which droop or curl
when touched.
Mimicry to trick animals.
