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* if the infection is minor, remove infected leaves as they appear and burn or place in the garbage. Take care not to spread the infection by touching uninfected plants or composting them. Whole plants may need to be removed in the same way if the fungus has spread.

* Fungicides are available and a combination of two are often used.

* in future, grow resistant varieties as some are more prone to infection than others. Avoid conditions that promote fungal infections, such as overhead and night watering, or planting into areas within three months of the last infection.

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