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Darren E. Robinson, Nader Soltani, Christy Shropshire, and Peter H. Sikkema

Sweet corn ( Zea mays L.) production is important to the economy of Ontario where nearly 113,000 t of sweet corn are produced on nearly 10,000 ha annually [ Ontario Ministry of Agriculture, Food, and Rural Affairs (OMAFRA), 2013 ]. In 2012, sweet

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Nader Soltani, Peter H. Sikkema, John Zandstra, John O'Sullivan, and Darren E. Robinson

Sweet corn ( Zea mays L.) is an important field-grown vegetable crop in Ontario; nearly 170,000 t of sweet corn are produced on 14,000 ha with a farm-gate value of $22.8 million ( Mailvaganam, 2006 ). Effective weed control is important for the

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Sarah R. Sikkema, Nader Soltani, Peter H. Sikkema, and Darren E. Robinson

artemisiifolia ), common lambsquarters ( Chenopodium album ), jimsonweed ( Datura stramonium ), and Polygonum species ( Anonymous, 2006 ). Sweet corn is an important vegetable crop in Ontario, valued at nearly $23 million ( Mailvaganam, 2006 ). Currently

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Nader Soltani, Peter H. Sikkema, and Darren E. Robinson

Limited information exists on sweet corn (Zea mays) tolerance to postemergence (POST) applications of thifensulfuron-methyl under Ontario growing conditions. Eight sweet corn hybrids were evaluated for tolerance to thifensulfuron-methyl in four field experiments conducted in 2003 and 2004. Thifensulfuron-methyl was applied POST at 6 and 12 g·ha–1 a.i., the registered and twice the registered rate for use in soybean in Ontario. Sweet corn hybrid responses to thifensulfuron-methyl varied. Delmonte 2038 was the most sensitive to thifensulfuron-methyl and had as much as 92% visual injury, 76% height reduction, and 98% yield reduction compared to the nontreated control. Empire, GH1861, GH2298, and GH2684 hybrids showed visual injury of 53%, 55%, 53%, and 61%, height reduction of 34%, 31%, 32%, and 26% and yield reduction of 77%, 68%, 68%, and 51%, respectively. GG214, GH2547, and GSS9299 sweet corn hybrids were not as sensitive to thifensulfuron-methyl. The initial sensitivity observed in these hybrids was minimal and transient with no effect on yield. Although thifensulfuron-methyl is safe for use on some sweet corn hybrids, it has the potential to cause severe crop injury and yield reduction in other hybrids and therefore it should not be recommended for weed management in sweet corn production in Ontario.

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J.R. Heckman

values for vegetable crops such as sweet corn. To be relevant, the nutrient removal values must be based on current cultural practices and production technology. Although production guides often publish values for crop nutrient removal, the original

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Thomas M. Butzler, Elsa S. Sánchez, Steven M. Bogash, Timothy E. Elkner, William J. Lamont Jr., Robert Pollock, and Lee J. Stivers

As of 2012, Pennsylvania was ranked 10th in the United State for fresh market sweet corn production. Forty-eight percent (1898 farms) of Pennsylvania growers produce sweet corn on 12,715 acres [ U.S. Department of Agriculture (USDA), 2014 ]. Growers

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Jeffrey Gardner, Michael P. Hoffmann, and Margaret E. Smith

We thank the New York State Sweet Corn Research Association for their financial support. This research is a contribution to Regional Project NE-124, Genetic Manipulation of Sweet Corn Quality and Stress Resistance. The cost of publishing

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Cheryl-Ann L. Corbett, Nader Soltani, Allan S. Hamill, Peter H. Sikkema, Stephen Bowley, and Darren E. Robinson

Trials were conducted over 2 years at three locations in Ontario to determine the tolerance of three sweet corn hybrids to postemergence application of nicosulfuron (25 and 50 g·ha–1), bromoxynil (280 and 560 g·ha–1), and nicosulfuron plus bromoxynil (25 + 280 g·ha–1 and 50 + 560 g·ha–1). All hybrids showed injury 7 days after treatment (DAT). The crop largely recovered from the injury in most treatments, as indicated by the ratings completed 14 and 28 DAT. However injury from the tankmix of nicosulfuron plus bromoxynil at both rates still appeared to be synergistic at 7, 14, and 28 DAT. Visual injury, height reductions and yield loss in the nicosulfuron plus bromoxynil (50 + 560 g·ha–1) treatment were more severe than in the other herbicide treatments. Yield of BSS5362 was significantly decreased in the nicosulfuron (50 g·ha–1) and nicosulfuron plus bromoxynil (50 + 560 g·ha–1) but was not affected by any other herbicide-hybrid combination. Caution must be exercised when using this tankmix combination, as there is potential to cause significant visual injury, height reductions and yield loss.

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Bernardo Ordás, Pedro Revilla, Pilar Soengas, Amando Ordás, and Rosa A. Malvar

The better emergence and seedling vigor of sweet corn (Zea mays L.) hybrids homozygous for the gene sugary1 (su1) make them more suitable for cultivation under European Atlantic conditions (cold, wet spring) than those homozygous for other traits. Elite sweet corn inbreds homozygous for both su1 and sugary enhancer1 (se1) could improve the table quality of su1 hybrids. The su1se1 inbreds for improving su1su1 hybrid performance can be chosen in several ways. The aim of this paper was to identify donors among su1se1 inbreds that might improve the quality of su1 hybrids. Eight su1se1 inbreds were crossed with eight su1 inbreds that were parents of fifteen su1 hybrids. Hybrids and inbreds were cultivated next to one another in two locations in northwestern Spain in 1999 and 2000. Several possible estimators for identifying su1se1 inbred donors with favorable alleles lacking in the su1 hybrid were determined. These estimators included the relative number of favorable alleles present in the donor but absent in the hybrid (μǴ), predicted three-way cross (PTC), minimum upper bound (UBND), net improvement (NI), probability of the net gain of favorable alleles when there is complete dominance (PNGg), probability of the net gain of favorable alleles when there is partial dominance or epistasis (PNGceg), and general combining ability (GCA). μǴ and NI were chosen for improving hybrid table quality. These estimators indicate that table quality and other traits of su1 hybrids can be improved by using germplasm from the su1se1 inbred lines. The best donor of quality for most of the hybrids was the inbred line IL731a.

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George H. Clough, Sarah Blatchford, and Philip B. Hamm

Oregon and Washington produce 30% of the U.S. processed sweet corn with a 2009 farm market value of $120,512,000 ( U.S. Department of Agriculture, 2009 ). The majority is produced in the Columbia Basin (central Washington and north–central Oregon