By Kali Charan Bahl
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Barley Disease Handbook, Neate, S. , North Dakota State University, 2005 Physiological Leaf Spot 46 • None known • Genetically inherited but only expressed under some environmental conditions Barley Disease Handbook, Neate, S. , North Dakota State University, 2005 CONTROL 47 Physiological Leaf Spot ABIOTIC SYMPTOMS Decreased germination, abnormally developed roots, stunting, a range of head and leaf distortion, and changes to color. Barley cultivars vary in their sensitivity to various agricultural chemicals.
Most grass weeds host the disease; other crops do not. Barley Disease Handbook, Neate, S. S. 43 Blackened center of roots infected with take-all fungus Take-all Barley Disease Handbook, Neate, S. ) SYMPTOMS Seedlings are stunted and slow growing, roots and stems become rotted and the seedlings die. Roots show a lack of root hairs and are stunted and brown. Crops show poor emergence and seedling growth. HOSTS A wide host range, including many agricultural crops. Generally associated with cool, wet conditions at seeding and during early growth.
Barley Disease Handbook, Neate, S. , North Dakota State University, 2005 Ergot Ergot oozing honeydew Germinating ergot fruiting structures • Plant clean seed • Sclerotia in the ﬁeld can be inactivated by burying 2 inches deep • Rotate with non-host crops for at least two years 37 Ergoted seed (left) and healthy seed (right) Ergot Barley Disease Handbook, Neate, S. ) SYMPTOMS Embryo ends of the grain become chocolate brown to black, and when more severe more of the grain darkens and becomes shriveled.