| 单词 | grey leaf blight |
| 释义 | > as lemmasgrey leaf blight grey leaf n. (more fully grey leaf spot, grey leaf blight) any of numerous plant diseases in which the leaves develop greyish lesions, esp. due to fungal infection or nutrient deficiency; cf. grey speck n. 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 1903 Monthly Circular Div. Zool. (Pennsylvania State Dept. Agric.) May 9 The Gray Leaf-blight or disease of cantaloupes and other melons. 1928 F. T. Brooks Plant Dis. ii. 15 On some alkaline soils oats cannot be grown profitably on account of a disease known as Grey-leaf. 1961 News Tribune (Fort Pierce, Florida) 24 July 2/6 Gray leaf spot is most prevalent during the warmer months, when ample moisture is present. 2009 V. Gowariker et al. Fertilizer Encycl. 283/1 If the symptoms of grey leaf develop early when the plants are small..manganese sulphate..can generally correct the deficiency. < as lemmas |
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