Sick Rose Tree in Reno: Frost Damage and Downy Mildew

Sick Rose Tree in Reno: Frost Damage and Downy Mildew

Two issues:

1. Late frost killed flower buds – if it's a once-blooming variety, no flowers this year.
2. Downy mildew – white powder on leaves, stunts new growth.

Treatment

• Mildew: Organic – 1 tbsp baking soda per quart water, spray daily until gone. Or use rose fungicide labeled for mildew.
• Aphids: Blast off with hose – eggs on cane tips won't re-climb; birds eat them.

Prevention

Improve air circulation; avoid overhead watering; apply preventive sprays early next season.