Summer Annual Weeds You May See During First Open Boll to Preharvest

Each name links to more information on identification and biology. See the weed photo gallery for more weeds.

Click on photos to enlarge
Seedling of annual morningglory, Ipomoea sp.
Identification tip: Morningglories, often called annual morningglories, have heart-shaped, first true leaves with deep lobes at the base. Hypocotyls are maroon at the base and green toward the apex. Seedling leaves are deeply notched.
Collar region of bermudagrass.
Identification tip: Bermudagrass leaves are rolled in the bud and the leaf sheath is flattened. The leaf blade is 10 times longer than it is wide and the leaf is more-or-less hairy. The ligule is a ring of hairs and there are no auricles. The collar region of bermudagrass has a fringe of short, white hairs and the sheath is smooth and green.
Johnsongrass seedlings.
Identification tip: Johnsongrass seedling leaves are rolled in the bud. The ligule is membranous and toothed, and without auricles. Leaf blades have a prominent white midrib. The first leaf blade is 8 times longer than it is wide.
Chrysoperla carnea, green lacewing larva.
Field bindweed
Identification tip: Seed leaves are nearly square with a shallow notch at the tip. Plants sprouting from rhizomes lack seed leaves. Early true leaves are spade- or bell-shaped.
Black nightshade seedling.
Identification tip: Seed leaves of black nightshade are elongate-oval and pointed; the first true leaves are spade-shaped with smooth edges. Lower surfaces are often purple.
Young yellow nutsedge plant.
Nutsedge, yellow or purple
Identification tip: Nutsedges grow mainly from tubers or "nutlets" formed on rhizomes, mostly in the upper foot of soil. Leaves are V-shaped in cross section and arranged in sets of three at the base. Stems are triangular in cross section.

Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2016 The Regents of the University of California. All rights reserved.

For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See our Home page, or in the U.S., contact your local Cooperative Extension office for assistance.

Agriculture and Natural Resources, University of California

Accessibility   /PMG/C114/m114opwds.html revised: June 24, 2016. Contact webmaster.