Lambsquarters

Treatment Grass 5 Redrootc,d Pigweed Q Common Lambsquarters c Common Ragweed... 

Ammonia naturally occurs in soybean (8,600 ppm), evening-primrose seeds (2,300-2,455 ppm), lambsquarter, and tobacco leaves (Duke, 1992). 

Betalain Color depends on pH Reduced flavonoid Betanin Pokeweed (Phytolacca Americana L.) Lambsquarters (Chenopodium americana L.) Named after beets. Occur in many flowers and fruits... 

In contrast, Ernst et al, (1996) have shown that a substitution at Ser264 does not necessarily lead to herbicide resistance. They found both Ser and Gly at position 264 in various sensitive and resistant biotypes of common groundsel. However, all resistant biotypes of black nightshade had Gly at position 264, but some of the sensitive biotypes also had Gly at this position. They suggested that the effect of this mutation in sensitive biotypes was overcome by two additional mutations in these biotypes alanine at position 251 (Ala25i) to arginine (Arg) and valine at position 280 (Val280) to leucine (Leu). In sensitive common lambsquarters, only Ser was present at position 264 either Ser or Gly were detected at position 264 in different atrazine-resistant plants (Ernst et al, 1996). 

Darmency, H. and J. Gasquez (1990a). Appearance and spread of triazine-resistance in common lambsquarters (Chenopodium album). Weed Technol., 4 173-177. 

Glenn, S., W.H. Phillips II, and P. Kalnay (1997). Long-term control of perennial broadleaf weeds and triazine-resistant common lambsquarters (Chenopodium album) in no-till com (Zea mays). Weed Technol., 11 436-443. 

Menbere, H. and R.L. Ritter (1995). Postemergence control of triazine-resistant common lambsquarters in no-till corn. Proc. Northeast. Weed Sci. Soc., 49 92. 

Atrazine is the only proven product for control of these six common and economically important broadleaf weed species with ALS-resistant biotypes in com. Product labels for each of the ALS herbicides recommend tank mixtures with atrazine. When used in the corn-soybean rotation, atrazine use in com breaks the continuous use of ALS-inhibitor herbicides and delays the spread of ALS-resistant biotypes. For example, Owen el al., (1995) reported that none of the ALS herbicides controlled ALS-resistant common lambsquarters, but atrazine provided excellent control. Sprague et al. (1997c) reported excellent control with atrazine both preemergence and postemergence on ALS-resistant, cross-resistant, and susceptible biotypes of common waterhemp. 

In some orchards where repeated applications of triazine herbicides have been used, there are isolated instances of triazine-resistant weeds. These include common groundsel in the United Kingdom (Holliday and Putwain, 1977) and common lambsquarters and pigweeds in Czechoslovakia, Poland, and Bavaria. Some studies indicated an increased prevalence of some tolerant weeds in orchards when triazine herbicides were used in certain crop weed systems of common vetch (Heeney et al., 1981a), field bindweed (Meith and Connell, 1985), and quackgrass (Hertz and Wildung, 1978). 

Kempenaar, C., Horsten, P.J.F.M., Scheepens, P.C. Growth and competitiveness of common lambsquarters (Chenopodium album) after foliar application of Ascochyta caulina as a my coherbicide. Weed Sci 1996 44 609-614. 

Summer annuals are plants that grow from seeds which sprout in the spring. They grow, mature, produce seed, and die before winter. Examples include crabgrass, foxtail, cocklebur, pigweed, and lambsquarters. 

The herbicidal activity of FMC 55626 at 1 kg/ha is summarized in Table I. Crops other than soybeans, e.g., cotton, corn, and wheat, are not tolerant. Velvetleaf and lambsquarters were quite susceptible (85-98%) whereas cocklebur and jimsonweed control ranged from 55-80%. Among the grass species, johnsongrass was the least susceptible (20% control). 

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