Discussion
Downy mildew is the most destructive fungal disease of grapevines and is caused by :
Answer: A
Downy mildew of grapevine is caused by Plasmopara viticola.
This oomycete (traditionally studied with fungi) appeared in Europe from North America in the 1870s and devastated vineyards; the search for a control led to Bordeaux mixture, discovered by Millardet in 1882. It produces oily spots on the upper leaf surface and white downy sporulation beneath.
The other pathogens attack different crops: Ascochyta rabiei causes Ascochyta blight of chickpea, Puccinia striiformis causes stripe (yellow) rust of wheat, and Sclerospora graminicola causes downy mildew (green ear) of pearl millet, not of grapevine.
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