COMMON ROSE DISEASES
ROSES
Downy Mildew
It impacts roses throughout the United States.
Symptoms:
infection starts on immature plant growth.
leaves grow dark purplish to dark brown spots.
may look like burns made by chemical toxicity.
wet, cool conditions favor downy mildew infection.
Rust
While rust is far-flung, it is consistently a problem in Western states.
Symptoms:
yellow rust spots show up on the upper side of leaves during cool climate in spring or late fall.
Infected leaves turn twisted around and dry.
spores infect leaves if fog, dew or rain happens at temperatures from 55 to 75 degrees F.
Powdery Mildew
Powdery mildew and black spot are the 1-2 blow on roses. It takes place in all parts of United States.
Symptoms:
powdery mildew commonly appears on new growth, in times of warm, rainless days followed by cool, wet nights.
new leaves may turn curled or twisted, and the shoots will appear badly distorted.
sometimes, the top surface of the leaves seems natural, but there is wide fungus growth on the leaf underside.
Suggestion:
don't place roses in shaded spots, particularly in regions that incline to dry out easy in the morning.
Black Spot
Primarily affects roses.
Symptoms:
lower leaves of nonresistant plants become spread over with brownish-black spots; finally the leaves yellow and fall off.
serious infestation can entirely defoliate a plant in a period of weeks.
diseased spores are broadcasted by rain and water irrigation.
black spot spreads rapidly in moist or humid, warm climate.
Suggestions:
don't wet foliage.
prune the plant to permit good air circulation between branches.
jim ellison enterprises
342 broken arrow
floresville, texas 78114
info@basic-info-4-organic-fertilizers.com
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