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Shasta daisy > Brown blotch
Why is My Shasta daisy Developing Brown Spots?
Shasta daisy, also known as Max daisy, Pyrenees chrysanthemum
Brown spot is a fungal disease caused by the pathogen Zythia fragariae. It affects Shasta daisy by discoloring its leaves and diminishing its flowering capability, subsequently compromising the plant's health and aesthetics.

Symptom Analysis

The disease manifests as brown or black circular spots on the leaves of Shasta daisy. In advanced cases, the spots coalesce and cause premature leaf drop, significantly reducing flowering.
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What Causes Brown blotch Disease on Shasta daisy?

pathogen
Zythia fragariae, a type of fungi which thrives in damp conditions, primarily causing leaf discoloration in Shasta daisy.
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How to Treat Brown blotch Disease on Shasta daisy?

Non pesticide
Action: frequent inspection and removal of affected leaves, to prevent the spread of the fungus.

Action: maintaining an open, airy plant structure, to reduce damp conditions.

Action: use disease-resistant varieties of Shasta daisy, if available.
Pesticide
Action: application of suitable fungicides, for instance those containing chlorothalonil or mancozeb, as per label instructions.

Action: repeated applications may be necessary during wet periods to prevent reinfection.

How to Prevent Brown blotch on Shasta daisy?

Method
applying mulch beneath the plant to prevent fungal spores from splashing onto leaves.

watering at the base of the plant to inhibit the creation of damp conditions favoured by the fungus.

annual soil sterilization, to kill off any lingering spores.
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When is Brown blotch Most Active Period on Shasta daisy?

Brown spot is most active during warm, damp conditions, particularly in spring and fall, due to the pathogen's preference for high humidity.

Infectivity

The disease can spread to nearby plants of the same species but doesn't tend to cross species.

Lethality

Though it damages aesthetics and may reduce flowering in Shasta daisy, it's rarely deadly if managed promptly.

FAQs on Shasta Daisy

What is Brown spot?
Brown spot is a fungal disease affecting plants like Shasta daisy, causing brown to black leaf discoloration and reduced flowering. It's caused by the fungus Zythia fragariae.
When is Brown spot most active?
The disease is most active in warm, damp conditions, such as in spring and fall.
Is Brown spot lethal to Shasta daisy?
While the disease can severely affect Shasta daisy's aesthetics and flowering, it's rarely lethal if managed early.
How can I cure Brown spot in Shasta daisy without using pesticides?
Non-pesticide control includes frequent inspection and removal of affected leaves, maintaining an open, well-drained plant structure, and using disease-resistant varieties if available.
How can I prevent Shasta daisy from getting Brown spot?
Preventive measures include applying mulch beneath the plant, watering only at the base of the plant, and performing annual soil sterilization.
Can Brown spot spread to other plants?
The disease can spread to nearby plants of the same species, but it usually does not cross over to different species.
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