Plant Diseases Flashcards
1
Q
Why are plants so vulnerable to pathogens?
A
Plants are not only attacked internally by pathogens but externally by pests.
2
Q
What are aphids?
A
Aphids are a species of pest with sharp mouths. They use these to penetrate the phloem vessels and feed on the sap, and depriving the plant of the products of photosynthesis.
3
Q
How can pests be destroyed?
A
Pests can be destroyed using chemical pesticides, or in enclosed spaces biological pest control, such as ladybirds to deal with aphids.
4
Q
What is mineral deficiency?
A
Mineral deficiency is when plants don’t get the minerals they need from the soil. For example, if they lack magnesium ions they can’t make the chlorophyll they need for photosynthesis.
5
Q
What are some clear signs of disease in plants?
A
Stunted growth Spots on leaves Areas of rotting Growths Malformations Discolouration Visible pests
