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Shasta daisy > Dark blotch
What Causes Dark Blotch on Shasta daisy Leaves?
Shasta daisy, also known as Max daisy, Pyrenees chrysanthemum
Dark blotch is a fungal infection affecting Shasta daisy, causing unsightly lesions and potentially reducing plant vigor if untreated. Prompt identification and treatment can mitigate damage.

Symptom Analysis

On Shasta daisy, symptoms include dark, circular spots on leaves, petal discoloration, wilted foliage, and possible progression to stem lesions.
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What Causes Dark blotch Disease on Shasta daisy?

Pathogenic fungi
Often from genera such as Alternaria or Phoma, they thrive in damp conditions and infect through spores.
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How to Treat Dark blotch Disease on Shasta daisy?

Non pesticide
Removal of affected parts: Prune and discard infected foliage and branches to reduce fungal spread.

Improve air circulation: Space plants adequately and control weeds to promote drying of foliage.

Sanitation: Clean tools and avoid working with plants when wet to prevent transmitting spores.
Pesticide
Fungicide application: Use approved fungicides, starting treatments at the first sign of disease and following label directions.

How to Prevent Dark blotch on Shasta daisy?

Proper watering
Water Shasta daisy at the base to avoid wetting the foliage, which could promote spore germination and disease.
Mulching
Apply mulch to reduce soil splash and prevent infection from soil-borne spores.
Resistant varieties
Choose disease-resistant cultivars of Shasta daisy to reduce the potential of infection.
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When is Dark blotch Most Active Period on Shasta daisy?

The disease is most active in humid, warm conditions, as these environments favor fungal growth and spore dispersal.

Infectivity

Spores can spread between plants but management practices can control its spread.

Lethality

Rarely lethal but can weaken Shasta daisy and lead to significant aesthetic damage.

FAQs on Shasta Daisy

Can dark blotch kill Shasta daisy?
While not typically lethal, dark blotch can weaken Shasta daisy and make it susceptible to other stresses.
How can I tell if Shasta daisy has dark blotch?
Look for the primary symptom of dark, circular spots on leaves and other parts of Shasta daisy.
Should I remove leaves of Shasta daisy with dark spots?
Yes, prune affected leaves and dispose of them properly to prevent disease spread.
Can this disease spread to other types of plants?
Dark blotch can spread to other plants if they are susceptible to the same pathogen.
Is it safe to plant Shasta daisy where dark blotch-affected plants were previously grown?
It is best to rotate crops and not replant Shasta daisy in the same soil without proper sanitation and treatment.
What are the ideal weather conditions for treating dark blotch?
Treatment should be applied during dry weather to allow fungicides to adhere and reduce fungal growth.
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