Useful tips for growing tomatoes:
- Use disease free seed. There's no evidence that it is carried by seeds.
- Start with a clean garden. Dispose of all affected plants. The fungus does not remain in the soil, but it can over-winter on the debris of diseased plants. So it's important to dispose of all the affected plants far away from the garden and the compost pile.
- Avoid overhead watering. Water aids the spread of Septoria leaf spot. Keep it off the leaves as much as possible by watering at the base of the plant only.
- Provide room for air circulation. Leave some space between your tomato plants so there is good air flow. Stake them so that they are not touching the ground and not all bunched together. Good air circulation is especially important during damp and rainy periods.
- Mulch (A protective covering of rotting vegetable matter spread to reduce evaporation and soil erosion) below the plants. A layer of mulch will prevent spores on the ground from splashing up onto the lower leaves.
- Consider organic fungicide options. Fungicides containing either copper or potassium bicarbonate will help prevent the spreading of the disease. Begin spraying as soon as the first symptoms appear and follow the label directions for continued management.
- Plant next year's tomatoes in a different section of your garden. In small gardens, it's not always practical to rotate your crops, so good clean up and sanitation become even more important.
Know more about Tomato diseases & control:
http://seedbuzz.com/knowledge-center/article/tomatoes-diseases
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