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First of all, you must know what actually these black spots are. They are actually a fungal disease typically caused from moist and cooler weather. Blackspot disease is one of the most common diseases of rose bushes; and, if left unchecked, it can cause quite a bit of damage to your rose plants. The causative organism is the fungus Diplocarpon rosae.
Black spot rose disease is characterized by black spots on the upper side of leaves. This Fungus spreads quickly and can move from plant to plant if intervention is not done quickly. So, these are the 5 important steps to control black spot rose disease.
- Location: Carefully Choosing Your Rose Garden location is very important to prevent the development and spread of this fungus. Choose a location which receives Atleast 6-8 hours of direct sunlight and preferably morning sunlight is best so that the night time dew dries out early. Also there should be enough air circulation around the plants.
- Soil: Water should not stagnate around the plant at any cost. So make sure you have a well draining soil for your potted plant.
- Watering Frequency and method should be appropriate. Watering early morning is best way to prevent fungus so that the leaves dry out quickly rather than leaving them wet overnight by watering in the evenings.
The first three steps I discussed are mainly preventive measures and also a part of treatment of this black spot fungus in rose plants. Now moving on to the two most important steps for actual treatment or the complete removal of this problem. - Pruning: If your black spot disease is not so extensive, so soft pruning or remove only the affected leaves. Trim off all the affected leaves and branches and keep them away and dispose them safely so that your other plants should not get infected. Better use a trash bag and dispose them.
- Now before moving on to the actual remedy for black spot rose disease, we should understand the pattern of this black spot or brown spot rose disease:
- They are Circular black spots or brown spots on the leaves.
- The lower leaves tend to be infected first, and then it spreads quickly to the whole plant.
- The leaves then turn yellow and fall off.
- Then eventually the plant becomes weaker and it either blooms less or stops blooming.
Many recommend spraying with broad spectrum chemical fungicides like imidacloprid, mancozeb which is a component of SAAF powder and other like trifloxystrobin, Ziram, chlorothalonil and many others. Even Copper and Sulfur fungicides work great for black spot rose disease treatment. I think you can reserve this if your conventional organic treatment fails.
What I recommend is an Organic Solution – that is NEEM OIL SPRAY. 5ml neem oil in 1 liter of water weekly twice for 2 weeks and then maintenance dose of atleast monthly once or once in 15 days.
So, there we have it folks. That was a quick gardening tutorial on how to cure black spot rose disease. Please Share this Article by clicking on social share icons. Also comment your feedback below. Happy Gardening.
