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Special Weeds—Preplanting

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  • Dodder
  • Field bindweed
  • Nutsedges
  • Black nightshade
  • Hairy nightshade

Special management practices may be required when planting tomatoes in fields that are severely infested with hard-to-control weeds such as nightshades, little mallow (cheeseweed), field bindweed, nutsedge and parasitic dodder. For information on management see Special Weeds of Tomato. Names link to more information on identification and biology.

Click on photos to enlarge

Dodder seedling
(Cuscuta spp.): Morningglory family; summer annual; leafless or with small scalelike triangular leaves about 1/16-inch in length; stems slender, twining or threadlike; vary in color from pale green to yellow or bright orange.

Field bindweed
(Convolvulus arvensis): Morningglory family; perennial; seed leaves nearly square, with shallow notch at tip; early true leaves spade-shaped; petioles flattened.

Young yellow 
				nutsedge plant.
(Cyperus spp.): Sedge family; perennial; first leaves inconspicuous and grasslike; grow mainly from tubers or "nutlets" formed on rhizomes, mostly in upper foot of soil; in cross section, leaves V-shaped, arranged in sets of three at base, and stems triangular.
				nightshade seedling.
Black nightshade
(Solanum nigrum): Nightshade family; summer annual; seed leaves oval and pointed; first true leaves spade shaped with smooth edges; lower surfaces often purple; petioles stems and leaves with some hairs.
				nightshade seedling.
Hairy nightshade
(Solanum sarrachoides): Nightshade family; summer annual; seed leaves narrow, small, and lanced shaped with very short soft hairs along edges; first true leaves with wavy edges and prominent veins.

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