. Minor diseases Orobanche is sometimes parasitic on beans. Sunscald ^^^ produces discoloration. Powdery-mildew (Erysiphe polygoni DC.) often gives a rusty color to the pods. Leaf-blotch (Cercospora cruenta Sacc.) occurs only upon the foliage as brownish patches, causing the ^ leaves to fall away. The spots ^^^'^ are large, angular, and limited ^^, ^ by the veins. Leaf-spot (Isar- / iopsis griseola Sacc.) is chiefly limited to the foliage, produc- ing small, angular spots, over the under surface of which the fungus forms a gray, moldy covering. It has been ob- . ^L served in many states, and i
. Minor diseases Orobanche is sometimes parasitic on beans. Sunscald ^^^ produces discoloration. Powdery-mildew (Erysiphe polygoni DC.) often gives a rusty color to the pods. Leaf-blotch (Cercospora cruenta Sacc.) occurs only upon the foliage as brownish patches, causing the ^ leaves to fall away. The spots ^^^'^ are large, angular, and limited ^^, ^ by the veins. Leaf-spot (Isar- / iopsis griseola Sacc.) is chiefly limited to the foliage, produc- ing small, angular spots, over the under surface of which the fungus forms a gray, moldy covering. It has been ob- . ^L served in many states, and is "-'*'' most injurious in the South.^'^' Wilt due to Pseudomonas sol- anacearum has also been re- ported. Root-knot (nema- todes) is injurious in some localities. Streak. — Dark spots occur on stems, leaves, and pods. The cause is un- known. Mosaic ^^ in general character resembles tobacco j,^^ gg _ j^i,^^.^^^^ p^^^ ^l^^^. mosaic. It appears to be of ing pod-blight. AfterHalsted. wide distribution and to be communicated through the seed. Resistant strains should be grown. BEET, CHARD, MANGOLD, MANGELS Cercospora Leaf-spot ^^^~^^'' {Cercospora beticola Sacc). ^ This, one of the several leaf-spots upon the beet, is very widespread in the eastern and middle states. Very few fields are entirely free from it. It occurs upon all varieties, but is especially injurious to the sugar beet. '"-S
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Keywords: ., bookauthorstevensf, bookcentury1900, bookdecade1920, bookyear1921
