| 单词 | marsh spot |
| 释义 | > as lemmasmarsh spot marsh spot n. a manganese deficiency disease of peas (first recorded in Romney Marsh), in which the cotyledons in the seed show brown lesions in the centre. ΘΚΠ the world > plants > disease or injury > [noun] > type of disease > deficiency diseases > associated with crop or food plants greenback1926 grey leaf1928 marsh spot1931 tea yellows1931 speckled yellows1938 grey speck1947 1931 Essex Farmers' Jrnl. 10 71/1 Marsh-Spot disease of peas..is carried in the seed... Marsh-Spot is usually brought on to a farm in the seed peas. 1934 Jrnl. Ministry of Agric. Dec. 833 From time to time complaints are raised concerning a defect in pea seeds to which the name Marsh Spot has been given. The term appears to have originated from the fact that the trouble is most common in seeds from crops grown in low-lying marsh land... The defect..shows itself mainly in the form of a dark, often slightly sunken spot..on the face of each seed-leaf. 1959 New Biol. 30 91 Diseases such as..‘marsh spot’ of peas are caused by the low availability of manganese in the soil. 2004 D. Singh & S. B. Mathur Histopathol. Seed-Borne Infections ix. 249 Marsh spot is characterized by discolored brown areas in the center of the adaxial face of the cotyledons. < as lemmas |
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