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James W. Shrefler, William M. Stall and Joan A. Dusky

Three field studies on high-organic-matter soils were conducted to determine the zone of influence of spiny amaranth on lettuce head quality. Spiny amaranth reduced lettuce head firmness at all distances from the weed, ≤105 cm. Lettuce ribbiness increased at 15 and 45 cm compared with the weed-free control. Untrimmed lettuce head weight was not affected by spiny amaranth presence beyond 45 cm. Trimmed lettuce head weight was reduced at all distances compared with the control. Stem diameter and core length were not affected by spiny amaranth competition. The presence of a single spiny amaranth plant significantly influenced some lettuce quality traits at ≤105 cm.

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Charles L. Webber III, Merritt J. Taylor and James W. Shrefler

initial applications, smooth crabgrass was 8 to 15 cm tall, cutleaf groundcherry was 5 to 8 cm tall, and spiny amaranth was 5 to 8 cm tall. Smooth crabgrass represented 60% of the weed cover, whereas cutleaf groundcherry and spiny amaranth represented 36

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Charles L. Webber III, Merritt J. Taylor and James W. Shrefler

applications. At the time of initial applications, smooth crabgrass was 8 to 10 cm tall, cutleaf groundcherry was 5 cm tall, spiny amaranth was 8 to 10 cm tall, and yellow nutsedge was 10 to 15 cm tall. Smooth crabgrass represented 60% of the weed cover, while

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Dennis C. Odero, Jose V. Fernandez and Nikol Havranek

control and 100% being crop death or complete weed control at 14 and 28 DAT. Prevalent weed species were common lambsquarters ( Chenopodium album L.), spiny amaranth ( Amaranthus spinosus L.), and fall panicum ( Panicum dichotomiflorum Michx.) at

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Dennis C. Odero and Alan L. Wright

, respectively. Weed populations in 2011 and 2012 ( Table 1 ) comprised common lambsquarters, spiny amaranth ( Amaranthus hybridus L.), common purslane ( Portulaca oleracea L.), goosegrass [ Eleusine indica (L.) Gaertn.], fall panicum ( Panicum dichotomiflorum

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Megh Singh, Mayank Malik, Analiza H.M. Ramirez and Amit J. Jhala

of herbicide treatments on control of florida/brazil pusley, common purslane, and dogfennel at 14, 42, and 86 d after treatment (DAT) at Lake Alfred, FL, in 2009. Table 6. Effects of herbicide treatments on control of spiny amaranth, spanishneedles

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Orville C. Baldos, Joseph DeFrank and Glenn Sakamoto

rubber ( Hevea brasiliensis ) as well as in natural areas, rangelands, permanent grass pastures, and industrial vegetation management areas such as roadsides ( Senseman, 2007 ). Weed species controlled by aminopyralid include spiny amaranth ( Amaranthus

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Orville C. Baldos, Joseph DeFrank and Glenn Sakamoto

, natural areas, grazed areas, and industrial vegetation management areas such as roadsides ( Senseman, 2007 ). It is a selective herbicide used for controlling key broadleaf weeds, including spiny amaranth ( Amaranthus spinosus ) and beggarticks ( Bidens

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Fekadu Fufa Dinssa, Peter Hanson, Dolores R. Ledesma, Ruth Minja, Omary Mbwambo, Mansuet Severine Tilya and Tsvetelina Stoilova

c , 2004d , 2004e ); prince’s feather ( Amaranthus hypochondriacus ), spiny amaranth or thorny pigweed ( Amaranthus spinosus ), and green amaranth or pigweed ( Amaranthus viridis ) ( Jansen, 2004a , 2004b , 2004c ); and Mediterranean amaranth

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, cutleaf groundcherry, spiny amaranth, yellow nutsedge, and purple nutsedge was no greater than 54%, 79%, 75%, 5%, and 46%, respectively, when clomazone was applied alone. Flumioxazin at 2.5 oz/acre provided 86%, 100%, 98%, 76%, and 73% control of these