animal + plant pathogens + diseases

what are communicable diseases?

diseases that are caused by infective organisms known as pathogens.

what are the 2 modes of action by pathogens?

• damaging host tissues directly

• producing toxins which damage host tissues

what causes disease symptoms?

damage caused by the pathogen combined with the host body’s responses to this damage

how do pathogens damage host tissues directly?

• fungi digest living cells and destroy them

how do pathogens damage host tissues through toxins?

name a bacterial plant disease and its effect

name a viral plant disease and its effect

tobacco mosaic virus

• virus that affects tobacco plants, peppers, cucumbers, etc

• damages leaves, flowers and fruits, stunting growth and reducing yield

• resistant strains available but no cure

name a plant disease caused by a protoctist and its effect

name a fungal plant disease and its effect