Plant Disease Flashcards

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Name three causes of plant disease or poor plant health.

Pathogens (viruses, bacteria, fungi), insect pests, and lack of mineral ions.

Give three signs that a plant may be diseased.

Spots on leaves, areas of rot (decay), and stunted growth.

What is chlorosis?

Yellowing of leaves due to too little chlorophyll, often from magnesium deficiency.

Which ion do plants need to make proteins, and what happens if it is low?

Nitrate ions; a lack causes stunted growth.

Which ion do plants need to make chlorophyll, and what happens if it is low?

Magnesium ions; a lack causes chlorosis (yellow leaves).

What are aphids and why are they a problem for plants?

They are small insects that suck sap and can spread pathogens.

What does vector mean in plant disease?

An organism that carries a pathogen between plants, for example aphids.

How could you check a plant’s symptoms at home or school?

First look for signs on the plant. Then compare them with a gardening book or website.

How can a lab or test kit confirm a plant disease?

They can test samples. Kits with monoclonal antibodies bind the pathogen and show a colour change.

Why can leaf discolouration slow plant growth?

Less chlorophyll means less photosynthesis, so less glucose is made for growth.