downy mildew Flashcards
1
Q
what are the signs of damage of downy mildew?
A
white bloom on under surface of leaf
2
Q
when does downy mildew occur?
A
in a humid climate or,
in spring when seedlings are germinating and tissues are vulnerable.
3
Q
what plants are prone to downy mildew?
A
stocks, wallflowers, brassicas, capsella bursa pastoris
4
Q
life cycle and spread of downy mildew is
A
spread by wind currents.
asexual spores are produced on lower leaf surface in spring/summer.
The sexual spores are produced within leaf tissues, they fall to the ground with the death of the leaf and survive over winter.
rain splash can carry the spores up from the soil to the lower leaf surface of seedlings/young plants
5
Q
control methods
A
long crop rotation of brassicas in a field
use of fungicide with copper oxychloride
