Pacific Pests, Pathogens and Weeds

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Summary

• Worldwide distribution. On sorghum, millet and Johnson grass. Relatively minor importance.
• Reddish-brown, somewhat rectangular spots (streaks) up to 3 mm wide and 15 mm long on the lower leaves, moving progressively upwards. Streaks merge in wet weather, causing a blight. Large blotches occur on leaf bases and stems.
• Cultural control: avoid planting successive crops on the same land; use 'clean' seed, i.e., from healthy crops; collect trash and burn after harvest.
• Chemical control: none recommended.