injurious plant

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• 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

• resurrection plant — Rose Rose, n. [AS. rose, L. rosa, probably akin to Gr. ?, Armor. vard, OPer. vareda; and perhaps to E. wort: cf. F. rose, from the Latin. Cf. {Copperas}, {Rhododendron}.] 1. A flower and shrub of any species of the genus {Rosa}, of which there… …   The Collaborative International Dictionary of English

• Cotton plant — Cotton Cot ton (k[o^]t t n), n. [F. coton, Sp. algodon the cotton plant and its wool, coton printed cotton, cloth, fr. Ar. qutun, alqutun, cotton wool. Cf. {Acton}, {Hacqueton}.] 1. A soft, downy substance, resembling fine wool, consisting of the …   The Collaborative International Dictionary of English

• jumping plant louse — any of numerous lice, of the family Psyllidae, that feed on plant juices and are sometimes pests of fruits and vegetables. Also called psylla, psyllid. [1900 05] * * * ▪ insect       any member of the approximately 2,000 species of the insect… …   Universalium

• Weed — Weed, n. [OE. weed, weod, AS. we[ o]d, wi[ o]d, akin to OS. wiod, LG. woden the stalks and leaves of vegetables D. wieden to weed, OS. wiod[=o]n.] [1913 Webster] 1. Underbrush; low shrubs. [Obs. or Archaic] [1913 Webster] One rushing forth out of …   The Collaborative International Dictionary of English

• Weed hook — Weed Weed, n. [OE. weed, weod, AS. we[ o]d, wi[ o]d, akin to OS. wiod, LG. woden the stalks and leaves of vegetables D. wieden to weed, OS. wiod[=o]n.] [1913 Webster] 1. Underbrush; low shrubs. [Obs. or Archaic] [1913 Webster] One rushing forth… …   The Collaborative International Dictionary of English

• weed — 1. noun /wiːd/ a) Any plant growing in cultivated ground to the injury of the crop or desired vegetation, or to the disfigurement of the place; an unsightly, useless, or injurious plant. If it isnt in a straight line or marked with a label, its a …   Wiktionary

• whitefly — noun Date: 1813 any of numerous small homopterous insects (family Aleyrodidae) that are injurious plant pests …   New Collegiate Dictionary

• lepidopteran — /lep i dop teuhr euhn/, adj. 1. lepidopterous. n. 2. a lepidopterous insect. [1850 55; LEPIDOPTER(A) + AN] * * * Any of the more than 100,000 species constituting the order Lepidoptera (Greek: scaly wing ): butterflies, moths, and skippers. The… …   Universalium

• Jacobaea vulgaris — Scientific classification Kingdom: Plantae (unranked) …   Wikipedia

• Weed control — is the botanical component of pest control, stopping weeds from reaching a mature stage of growth when they could be harmful to domesticated plants and livestock by physical and chemical methods. In order to reduce weed growth, many weed control… …   Wikipedia