Q. Here’s the pic of what’s going on with my
roses. What do you think? Black spot or rust?
roses. What do you think? Black spot or rust?
A.This was sent to me in July, 2014.
I really didn’t see any black spot or rust in the
picture. Black spot of roses have the typical “black spots” on the
leaves and rust are pustules on the leaves that can be rubbed off with your
fingers.
Both are more common during the
spring, periods of high humidity and too much shade. Usually full sunlight,
drip irrigation (no overhead irrigations), watering during early morning hours,
fertilizing regularly and our dry conditions seldom lend itself to either
disease here.
spring, periods of high humidity and too much shade. Usually full sunlight,
drip irrigation (no overhead irrigations), watering during early morning hours,
fertilizing regularly and our dry conditions seldom lend itself to either
disease here.
If you need to put on a
preventive treatment on roses in the spring or fall, apply one of these
treatments to the leaves: sulfur dust, Neem oil or compost tea.
preventive treatment on roses in the spring or fall, apply one of these
treatments to the leaves: sulfur dust, Neem oil or compost tea.
The damage looks more like
spider mites, drought or lack of fertilizer. Make sure roses have an organic
surface mulch applied to the top of the soil that decomposes (wood chips), use drip
irrigation, water early in the morning and are fertilize during the spring and
fall months.
spider mites, drought or lack of fertilizer. Make sure roses have an organic
surface mulch applied to the top of the soil that decomposes (wood chips), use drip
irrigation, water early in the morning and are fertilize during the spring and
fall months.