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Charles L. Webber and James W. Shrefler

Producers and researchers are interested in pelargonic acid (nonanoic acid) as a broad-spectrum postemergence or burn-down herbicide. Pelargonic acid is a fatty acid naturally occurring in many plants and animals, and present in many foods we consume. The objective of this research was to determine the effect of pelargonic acid concentration, adjuvants, and application timing on weed control efficacy as a burn-down herbicide. Field research was conducted at Lane, Okla. (southeast Oklahoma), during the 2005 growing season. One month prior to spraying the weed control treatments, the land was cultivated to kill the existing weeds and provide a uniform seed bed for new weed growth. The factorial weed control treatments included three application concentrations of Scythe (57.0% pelargonic acid) applied at 3%, 6.5%, and 10%; three adjuvants (none, orange oil, and non-ionic surfactant); and two application dates. All herbicide treatments were applied with an application volume of 935 L/ha to seedling weeds. The experiment had a high weed density with multiple species of grass and broadleaf weeds. Weed control across species increased as the herbicide concentrations increased from 0% to 10%. At all concentrations applied, pelargonic acid produced greater weed control for a longer time period for the broadleaf weeds than the grass weeds. Visual damage to the weeds was often apparent within a few hours after application. There was a significant increase in weed control when applied to the younger weeds. In this research, pelargonic acid was effective in controlling both broadleaf and grass weeds as a burn-down herbicide, although crabgrass was tougher to control.

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Manuel G. Astacio and Marc W. van Iersel

mL, a reduction of 87% compared with the control plants ( Fig. 1 ). Fig. 1. Cumulative transpiration of tomato plants over a 28-h period after treatment with abscisic acid (ABA) drenches. Significant effects of ABA on cumulative transpiration were

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Simone da Costa Mello, Jéssika Angelotti-Mendonça, Lucas Baiochi Riboldi, Luigi Tancredi Campo Dall’Orto, and Eduardo Suguino

1. Effect of indole-3-butyric acid (IBA) concentration (0, 30, 60, and 90 mg·L −1 ) and cuttings type (softwood and semihardwood) on cutting survival (CS), rooting, number of roots (NOR), dry weight of roots (DWR), and root length (RL) of ‘Yabukita

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M. Cecilia Peppi and Matthew W. Fidelibus

Most seedless table grapes are treated with gibberellic acid (GA 3 ) to increase berry size and uniformity ( Diaz and Maldonado, 1992 ; Dokoozlian et al., 1994 ; Reynolds et al., 1992 ; Wolf et al., 1994 ). Application of the synthetic

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Uttara C. Samarakoon and James E. Faust

at 0, 40, 80, or 160 mg·L −1 . An SA [2-hydroxybenzoic acid, >99.0% (MP Biomedicals, Solon, OH)] solution was prepared with 150 or 300 mg·L −1 SA in deionized water after being dissolved in 10 mL of heated water (60 °C). A non-ionic surfactant

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Omar A. Lopez, Danny L. Barney, Bahman Shafii, and William J. Price

over time) was not given. Gibberellic acid (GA) is used to help break seed dormancy of many angiosperms ( Taiz and Zeiger, 2002 ). For instance, at 4 weeks after treatment with 900 ppm GA 3 , Dweikat and Lyrene (1989) found 50% of V. corymbosum

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Imed E. Dami, Shouxin Li, Patricia A. Bowen, Carl P. Bogdanoff, Krista C. Shellie, and Jim Willwerth

type, vineyard planting density, vine cultural practices, and ‘Chardonnay’ winegrape clone and rootstock at each trial site. Table 2. Field plot design and concentrations of abscisic acid (ABA) and surfactant in the foliar solutions that were applied to

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Jennifer Han, Jan E. Murray, Qingyi Yu, Paul H. Moore, and Ray Ming

sex-related phenotypic traits in response to gibberellic acid (GA 3 ) applications. All measurements shown are means ± SE. Treatment and control plants were compared using a Student’s t test. Values were considered significant if alpha ≤ 0.05. ( A

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Araceli M. Vera-Guzman, Maria T. Lafuente, Emmanuel Aispuro-Hernandez, Irasema Vargas-Arispuro, and Miguel A. Martinez-Tellez

polymerization (DP) from 3 to 20 were respectively obtained by enzymatic hydrolysis of either low methoxyl pectin (Grindsted ® LC-950; Danisco Mexicana, Colima, México) or polygalacturonic acid (Sigma-Aldrich, St. Louis, MO) using a pectinase from Aspergillus

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Brian A. Kahn and Niels O. Maness

. Another approach to increase the yield of a machine-harvested leafy greens crop is to use gibberellic acid (GA) to increase crop height at harvest. Gonzalez and Marx (1983) found that, for spinach ( Spinacia oleracea L.) sown in late summer or fall, 20