Content
- Rhododendron brown leaves and stains - what to do?
- Location, soil and weather damage
- Brownish yellowish rolled leaves - Rhododendron is thirsty:
- Rhododendron brown leaves and brown margin - frost damage
- Brown yellowish leaf blades - sunburn
- Damaged by fungi and mold
- Rhododendron brown leaves and brown buds
- Brown tips, brown leaf margin - leaf spot disease:
- Brown speckled leaf tip with mold - gray mold rot:
- Tips & Tricks
Rhododendron brown leaves and stains - what to do?
The rhododendron is one of the most popular plants in the garden and park. Its varied shape, evergreen leaves and colorful flower magic inspires every garden lover. In order to maintain healthy growth of heather plants, damage such as brown leaves or brown spots must be detected and treated in good time.
Location, soil and weather damage
Despite proper care and location, rhododendron may affect brown leaves and stains. To take effective action, you need to know what causes the diseases.
Brownish yellowish rolled leaves - Rhododendron is thirsty:
Before he dies of thirst, he rolls his leaves. With this protective measure, it reacts during long periods of drought in summer or in dry, cold winter weather.
What to do? When watering leaves do not moisten to avoid sunburn. Water in winter only on frost-free days to avoid frost damage. A layer of bark mulch keeps the root area longer frost-free.
Rhododendron brown leaves and brown margin - frost damage
In dry, cold and windy winter weather threatens the risk of frost damage in more sensitive, less hardy Rhododendron varieties. Recognizable by dead flower buds or brown leaves and leaf margins.
What to do? Cover with pine spruce or reed mats as additional wind and cold protection.
Cut back heavy frost damage in spring.
Brown yellowish leaf blades - sunburn
In sunburn, unshaded leaf blades turn brownish yellowish. Shaded leaves show no damage.
What to do? Shadow the rhododendron or transplant in a partially shaded place without midday sun. Check the leaves regularly as the weakened plant threatens fungal attack.
Damaged by fungi and mold
Differently shaped, brown spots on rhododendron leaves can cause up to 20 different fungi or rust and mold. Only a microscopic examination provides a detailed diagnosis of the cause.
Rhododendron brown leaves and brown buds
Cause are mostly fungal diseases like
All three fungal diseases are spreading rapidly. But rarely threaten the complete plant. In Phytophthora infestation, for example, the midribs of the leaves turn brown. The infection spreads from the inside to the outside and the leaves wither.
Brown tips, brown leaf margin - leaf spot disease:
The causes of this disease are different weakness parasites. The first indications are irregular brown spots on the edge of the sheet or the tip of the leaf.
Brown speckled leaf tip with mold - gray mold rot:
If there are brown spots with a greyish mold covering from the tip of the leaf, it is the gray mold blight. The infestation spreads over the whole leaf. Danger of infection threatens especially in humid warm weather
What to do? Preventive helps the right siting, a good plant nutrition and control leaves. In case of infestation, treatment with fungicides is required every 10 days. Collect defective, discarded leaves and dispose of them with household waste.
Tips & Tricks
Hands off rhododendrons with brown leaves or yellow leaves, these are signs of illness or nutrient deficiency.