infectious diseases in plants

Question 1

what are the 2 infectious diseases in plants that we study called?

Answer 1

The viral disease tobacco mosaic virus

the fungal disease rose blackspot

Question 2

what is tobacco mosaic virus (TMV)

Answer 2

TMV is a very widespread plant infection. TMV infects a number of different plant species including tomatoes

Question 3

plant symptoms of TMV:

Answer 3

causes the leaves to discolour in a MOSAIC pattern

Question 4

what is process reduced when a plant is infected with tobacco mosaic virus?
why?

Answer 4

photosynthesis is reduced
TMV causes plants to discolour in a mosaic pattern, this discolouration leads to the rate of photosynthesis being reduced

Question 5

why can the growth of a plant be reduced when it’s infected with tobacco mosaic virus ?

Answer 5

tmv causes the plant to discolour in a mosaic pattern meaning the rate of photosynthesis is reduced, this also means the growth is reduced as plants need photosynthesis to grow

Question 6

what is rose black spit caused by?

Answer 6

a fungus

Question 7

what are the symptoms of the rose black spot disease

Answer 7

causes the leaves to develop purple or black spots

the leaves then often turn yellow and fall off

causes rate of photosynthesis to fall and this reduces the rate of growth

Question 8

what can rose black spot fungus be spread by?

Answer 8

water or wind

Question 9

what are the 2 ways to treat rose black spot?

Answer 9

1. we can spray the plants with chemicals which kill fungi (fungicides)
2. we can remove the infected leaves and destroy them