Alternaria is a fungal pathogen affecting many important crops, such as oil crops, cereals, and vegetables. It is typically causing spots on leaves or stem cankers.
Alternaria symptoms once infection begins include small, dark, circular spots that regularly reach ½ inch (1 cm.) in diameter.
Avoid overhead watering to limit leaf wetness, and allow enough space at planting time for good air circulation and ample sun penetration. Keep your garden free of fallen leaves all season, and especially thorough at fall cleanup time.
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