(T4.3, L5) Plant diseases- TMV and Rose Black spot

Question 1

What pathogen type is Rose black spot?

Answer 1

Fungi

Question 2

What are the signs that a plant is infected with Rose black spot?

Answer 2

Purple/black spots develop on the leaves causing them to turn yellow and drop early.

Question 3

How does Rose black spot affect photosynthesis?

Answer 3

It reduces the area of leaf available for photosynthesis so the plant cannot grow properly.

Question 4

How does Rose black spot spread?

Answer 4

Spores are carried in the wind and spread over the plant as water drips from one leaf to another.

Question 5

What are 2 ways gardeners prevent/treat Rose black spot?

Answer 5

1. Removing/burning affected leaves
2. Using chemical fungicides to treat/prevent the spread of disease

Question 6

What does TMV stand for?

Answer 6

Tobacco Mosaic Virus

Question 7

What pathogen type is TMV?

Answer 7

Virus

Question 8

What are signs that a plant is infected with TMV?

Answer 8

‘Mosaic’ pattern of discolouration on the leaves because of destroyed cells.

Question 9

How does TMV affect photosynthesis?

Answer 9

Affected areas cannot photosynthesise so the plant cannot properly grow.

Question 10

What are 3 ways TMV spreads?

Answer 10

1. Contact between diseased and normal plants
2. Insects acting as vectors
3. Through infected soil (virus stays infectious in soil for 50 years)

Question 11

What are 2 ways gardeners prevent TMV?

Answer 11

1. Good field hygiene/ pest control
2. Removing/ burning affected leaves