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In a region of France, Downy mildew of g...

In a region of France, Downy mildew of grapes was confined to large varieties of grapes. Which of the following measures could be taken to grow grape vines in that region? a. Use of disease resistant varieties. b. Spray with Bordeaux mixture. C.Use of a chemical fertiliser. d. Spray with an insecticide.

A

a and b

B

b and c

C

c and d

D

a and d

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