Downy mildew (vine)

What you see

Oily yellow "oil spots" on the leaf top; white downy growth underneath after humid nights; berries harden and shrivel.

Conditions

Warm rain and morning fogs - the historic scourge of Atlantic vineyards.

Treatment

Copper (the Bordeaux-mixture tradition exists for this exact disease); remove infected leaves.

Prevention

Copper at bud burst and after warm rains; open the canopy so leaves dry fast; avoid overhead water.

Months: April

Plants

Grape

Remedies

Not recorded — the field is blank rather than guessed.

The thing people get wrong

Not recorded — the field is blank rather than guessed.