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American sycamore > Brown blotch
Why is My American sycamore Developing Brown Spots?
American sycamore, also known as Western Plane, American plane tree, Buttonwood
Brown spot is a fungal disease caused by Scirrhia acicola, affecting American sycamore and leading to leaf browning and premature defoliation. Although not lethal, it can severely impact the tree's vitality and growth.

Symptom Analysis

Significant symptoms on American sycamore include development of small, brown, circular spots with yellow halos on leaves. This often progresses to extensive browning, curling and premature leaf drop.
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What Causes Brown blotch Disease on American sycamore?

Pathogen
The primary cause of Brown spot is the fungus Scirrhia acicola, which can thrive in humid conditions and infect the leaves of American sycamore.
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How to Treat Brown blotch Disease on American sycamore?

Non pesticide
Prune infected branches: Pruning and destroying infected branches can prevent the spread of the fungus.

Improve air circulation: Thinning the tree can increase air circulation, reducing leaf dampness and inhibiting fungal development.
Pesticide
Apply fungicides: Regularly applying recommended fungicides during the growing season can help control the disease.

How to Prevent Brown blotch on American sycamore?

Regular inspection
Early detection of symptoms and immediate treatment can help in managing the disease.
Use resistant varieties
Planting disease-resistant varieties can drastically reduce the risk of infection.
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When is Brown blotch Most Active Period on American sycamore?

Brown spot is most active during wet, warm spring and early summer months when new leaves are emerging and conditions are optimal for fungal growth.

Infectivity

Brown spot spreads rapidly under favourable conditions, posing a serious threat to American sycamore clusters.

Lethality

The disease isn't typically lethal but can severely weaken American sycamore, making it susceptible to other diseases and pests.

FAQs on American Sycamore

What causes brown spots on American sycamore?
Brown spots on American sycamore are caused by a fungus named Scirrhia acicola, thriving in warm, damp conditions.
How can Brown spot be prevented in American sycamore?
Using disease-resistant varieties, regular inspection, pruning of infected branches, and improving air circulation can prevent Brown spot.
Can Brown spot kill American sycamore?
Brown spot isn't typically lethal but can severely weaken American sycamore, making it susceptible to other diseases and pests.
How can Brown spot be cured in American sycamore?
Pruning infected branches and implementing proper air circulation can help reduce fungal growth. Regular fungicide applications can also help control the disease.
Is Brown spot highly infectious on American sycamore?
Yes, Brown spot is highly infectious under favourable conditions, especially in warm, wet seasons.
When is Brown spot in American sycamore most likely to occur?
Brown spot is most likely to occur during warm, humid conditions, typically during wet spring and early summer months.
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