| 单词 | angular leaf spot |
| 释义 | > as lemmasangular leaf spot angular leaf spot n. an area of diseased or dead leaf tissue that is confined within leaf veins and has straightish edges; any of various plant diseases producing such lesions, esp. (a) bacterial blight of cotton caused by Xanthomonas campestris pv. malvacearum (also called blackarm); (b) a bacterial disease of cucumbers and other cucurbits caused by Pseudomonas syringae pv. lachrymans. ΘΚΠ the world > plants > disease or injury > [noun] > type of disease > bacterial diseases > associated with food or crop plants fire blight1742 apple blight1835 pear blight1854 leaf scald1870 ring rot1875 angular leaf spot1896 blackarm1902 Moko1913 halo blight1920 the world > plants > disease or injury > [noun] > type of disease > bacterial diseases > angular leaf spot (of cucumber) angular leaf spot1896 1896 G. F. Atkinson in A. C. True Cotton Plant 286 Angular leaf spot. This disease is named from the dark angular spots which appear in the leaf. 1915 Jrnl. Agric. Res. 5 465 The angular leaf-spot of cucumbers (Cucumis sativus) has been known in the field for many years. 1958 P. Spaulding Dis. Foreign Forest Trees U.S. (U.S. Dept. Agric.) 20 Cercospora salviicola... Causes rounded to angular leaf spots, 0.5 to 5 mm. across, gray with dark purple border. 2007 S. T. Koike et al. Veg. Dis. 224/1 Angular leaf spot occurs on cucurbits throughout the world and is particularly serious in more humid, warmer regions. < as lemmas |
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