Brown spots spoil the magnificent ornamental leaves and signal that your window leaf is not doing well. If the cause is not found, brown leaves are inevitable, which die off and fall to the ground. Use our tips on common causes and how to fix the problem.
If the Monstera is too cold, it will turn brown
In the cold, brown spots are not far away
Your window leaf loves a warm, humid location with moderate lighting conditions. The exotic piece of jewelry cannot stand the cold well, even for a short time. If the window is opened for a few minutes in winter to let the air out so that the temperature falls below 15 degrees Celsius, brown spots with a light edge form. When Monstera are exposed to constant cold, brown leaves are the answer to that stress.
If you can diagnose low temperatures as the cause of brown spots and brown leaves, a change of location will fix the problem. Sometimes it can be enough not to tilt the window in the immediate vicinity of the window sash during the winter.
Eye spot disease (Spilocaea oleagina)
If location problems can be ruled out as the cause of brown spots and brown leaves, diseases come into focus. Eye spot disease is often the cause of these symptoms. The fungal infection owes its name to brown spots with a light areola, which spread rapidly over the entire leaf. How to fight it:
- Cut off infected leaves and dispose of in the garbage can
- Disinfect the scissors with alcohol before each cut
- Treat re-infection sites with a copper-based fungicide
- Treat the diseased window leaf with Neudorff Atempo mushroom-free or Cueva mushroom-free
Since eye spot disease spreads very slowly, removing already infected leaves can be enough to control it. By regularly spraying the weakened window leaf with a decoction of horsetail or liverwort extract at the same time, the body's defenses are strengthened. Reaching out for a copper-containing fungicide is only required under high infestation pressure.
tips
A window leaf reacts to sunburn with light brown spots and a dark border. Monstera species are affected on the south-facing window of living rooms or on the balcony in summer. Immediately move the plant to a semi-shady place on the west or east window. An awning should filter the sunlight on the balcony.