Weed Science Laboratory - Lecture Slides | CS 414, Study notes of Agricultural engineering

Download Weed Science Laboratory - Lecture Slides | CS 414 and more Study notes Agricultural engineering in PDF only on Docsity! Agronomic Weeds - 2 CS 414 Weed Science Laboratory Smallflower morningglory Jacquemontia tamnifolia Convolvulaceae Summer annual, light blue flowers in clusters. Rounded cotyledons, resemble mustard Hairs on leaf margins, sometimes on blade. Entireleaf morningglory Ipomea hederacea var. integriuscula Convolvulaceae Heart-shaped leaves, hairy stand straight-up on leaf blade. Cotyledons have rounded points, moderately indented. Petals purple to pale blue, sometimes white, funnel-shaped or tubular flower. Pitted morningglory Ipomoea lacunosa Convolvulaceae Cotyledons deeply lobed, forming a ‘V’, glabrous. Stems and leaves slightly hairy. Apex of leaves extended. Leaves appear outlined with maroon. White flowers. Tall morningglory Ipomoea purpurea Convolvulaceae Moderate indention on cotyledons. Lobes are rounded. Cotyledons most “boxed” of all MG. First true leave and onward are heart-shaped. Leave bases over-lap at petiole-leaf connection (unlike I. lacunosa). Stems appressed on leaf blade. Purple flowers. Solanum carolinense horsenettle Solanaceae Perennial Stiff hairs on oblong cotyledons. Rhizomatous. Light purple flowers. Spines on leaf blade. All parts poisonous, except mature fruit. Light purple flowers. Fruit is a berry. Stems angled at nodes, extremely tough. Woody when older. Plant resembles cultivated eggplant. Wild radish Raphanus raphanistratum Brassicaceae Winter annual. May germinate in spring or early summer. Heart-shaped cotyledons. First true leaves are hairy & lobed. Toothed margins on all leaves. Stiff hairs on all leaves. Plant grows as basal rosette. Fruit is a silique (resembles a pod, but with central partition). Yellow flowers on hairy stems. Carolina geranium Geranium carolinianum Geraninaceae Biennial or winter or summer annual. Cotyledons hairy, kidney shaped. Basal rosette until upright stems and flowers develop. Stems to 28”, pink to red with dense hairs. Leaves hairy on upper and lower blade. Deeply divided with lobes on each division. Flowers light pink to purple, clustered at end of stems. Fruit resembles a crane’s bill. Common Name: crowfoot grass Family: Poaceae Genus: Dactyloctenium Species: aegyptium annual Hairs extend outward from the margins at even spacing, rest of the plant usually hairless Seedhead resembles a crow’s foot Ligule is fringed, membranous at base Common Name: barnyardgrass Family: Poaceae Genus: Echinochloa Species: crus-galli Summer annual •No ligule •Leaf blades glabrous, may have a few hairs at the base •White midvein on leaf blades Italian ryegrass Lolium multiflorum Poaceae Winter annual to 3 ft. Weed of small grains. Leaf sheaths are tinged red at base. Rolled vernation. Claw-like auricles at collar. Membranous ligule. Lower leaf blade glossy. Flower is a spike with alternately arranged awns. Common Name: giant foxtail Family: Poaceae Genus: Setaria Species: faberi Summer annual •upper surface of leaves covered in short hairs, except at the base • ligule fringe of hairs •seedhead larger than green or yellow foxtail, and droops when mature Common Name: yellow foxtail Family: Poaceae Genus: Setaria Species: glauca Summer annual •long, silky hairs near leaf base only (distinguish from giant and green) •ligule is a fringe of hairs •Seedhead yellow Common Name: green foxtail Family: Poaceae Genus: Setaria Species: viridis Summer annual •leaves have no hairs •ligule is a fringe of hairs •seedhead greenish