elm phloem necrosis
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phloem necrosis — noun : any pathological state in a plant characterized by brown discoloration and disintegration of the phloem: as a. : a phase of potato leaf roll in which such changes occur b. : a virus disease of tea c. : a fatal virus disease of the American … Useful english dictionary
phloem necrosis — Plant Pathol. a disease of the American elm caused by a mycoplasmalike organism, characterized by yellowing and necrosis of the foliage and yellowish brown discoloration of the phloem. [1920 25] * * * … Universalium
phloem necrosis — noun Date: 1923 a pathological state in a plant characterized by brown discoloration and disintegration of the phloem; especially a fatal disease of the American elm caused by a phytoplasma transmitted by a leafhopper (Scaphoideus luteolus) … New Collegiate Dictionary
Elm Yellows — is a plant disease of elm trees that is spread by leafhoppers or root grafts. Elm Yellows. Elmcare.Com. 19 Mar. 2008 . ] Elm Yellows, also known as Elm Phloem Necrosis, is very aggressive and there are no known cure for it. Elm Yellows is known… … Wikipedia
elm — /elm/, n. 1. any tree of the genus Ulmus, as U. procera (English elm), characterized by the gradually spreading columnar manner of growth of its branches. Cf. American elm, elm family. 2. the wood of such a tree. [bef. 1000; ME, OE; c. OHG elm;… … Universalium
Dutch elm disease — a disease of elms characterized by wilting, yellowing, and falling of the leaves and caused by a fungus, Ceratostomella ulmi, transmitted by bark beetles. [1920 25] * * * Widespread disease that kills elms, caused by the fungus Ceratocystis ulmi … Universalium
Phytoplasma — Phyllody induced by phytoplasma infection on a coneflower (Echinacea purpurea). Scientific classification Division … Wikipedia
homopteran — /heuh mop teuhr euhn, hoh /, adj. 1. homopterous. n. 2. a homopterous insect. [1835 45; see HOMOPTEROUS, AN] * * * ▪ insect order Introduction any of more than 32,000 species of sucking insects, the members of which exhibit considerable… … Universalium
scaphoideus — skəˈfȯidēəs noun Usage: capitalized Etymology: New Latin, from scaphoides scaphoid : a genus of leafhoppers including one (S. luteolus) that feeds on and transmits phloem necrosis to elm trees … Useful english dictionary
plant disease — ▪ plant pathology Introduction an impairment of the normal state of a plant that interrupts or modifies its vital functions. All species of plants, wild and cultivated alike, are subject to disease. Although each species is… … Universalium
