Black Spot

Fungal disease Black spot of rose caused by Diplocarpon rosae, close up view

Description Of black spot 

Black spot is a fungal disease that mostly affects roses, although it can also harm other ornamental and garden plants. It can be found on flowers, fruits, and foliage, and it can be a nuisance in hot and humid conditions. When leaves are wet for more than 6 hours, they cause the most problems.

Symptoms of Black spots 
On the upper sides of leaves, this fungal disease develops black, circular dots. Lower leaves are frequently the first to become affected. Infested leaves turn yellow and fall off the plant in severe infestations.
Tips for controlling black spots on leaves
  • Plant in a soil that drains properly. Regular organic fertilizer feedings will keep your plants healthy. This will assist in the prevention of fungal disease in plants.
  • The spores of the fungus survive the winter in plant detritus. Remove any dead leaves or infected canes from the area around the plants and throw them away. Don’t put anything in the compost pile.
  • After each usage, disinfect your pruners with a household disinfectant. Straight from the bottle, ethanol or isopropyl alcohol can be utilized.
  • Avoid spraying water on the leaves because water (not wind) spreads the fungus spores. Apply water directly to the roots when watering. Water plants that are susceptible to the illness with a soaker hose.
Home remedies to cure black spots on leaves 

A gallon of water and a tablespoon of baking soda are historically used to make a simple and inexpensive treatment. To make it stick to the plant, add a half teaspoon of horticultural oil or insecticidal soap.

Spraying this combination on the fungus changes the pH of the leaf surface, making it unlivable for the fungus. It simply costs a few cents a gallon.

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