The problem with geranium leaves that you have described, brown, sunken spots, is typically caused by a bacterial leaf spot infection. This is a common issue that occurs especially during the warm and wet months.
To address this problem, it is important to first remove any damaged foliage from the plant. This will help prevent the spread of the infection to healthy leaves. Be sure to carefully dispose of the affected leaves, either by placing them in a sealed bag or burning them, to prevent further contamination.
Next, you can apply a suitable fungicide to control the bacterial leaf spot. One option is to use a Liquid Copper fungicide, which is effective in treating bacterial infections in plants. Follow the instructions provided on the product label for proper application and dosage. Alternatively, you can choose to use an Eco-fungicide, which is an environmentally friendly option for controlling plant diseases.
When applying the fungicide, make sure to thoroughly cover all parts of the plant, including the undersides of the leaves. This will help ensure that the infection is properly treated and prevent its recurrence. It is important to note that fungicides should be used as a preventative measure or at the earliest signs of infection. If the infection has already spread extensively, it may be more challenging to control.
To further prevent the occurrence of bacterial leaf spot in geraniums, it is important to practice good cultural care. This includes providing adequate spacing between plants to allow for good air circulation. Overcrowding can create a favorable environment for the growth and spread of pathogens.
Additionally, avoid overhead watering as much as possible, as this can promote the development and spread of bacterial infections. Instead, water at the base of the plant, aiming for the soil rather than the leaves.
Regularly inspecting your geranium plants for any signs of disease or pest infestation is also crucial. By catching problems early on, you can take prompt action and prevent them from becoming more severe.
Brown, sunken spots in geranium leaves are likely caused by a bacterial leaf spot infection. To address this issue, remove damaged foliage, apply a suitable fungicide such as Liquid Copper or Eco-fungicide, and practice good cultural care to prevent future infections. Regular monitoring and early intervention are key to maintaining the health and vigor of your geranium plants.
