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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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Darren E. Robinson, Nader Soltani, Allan S. Hamill, and Peter H. Sikkema

Combining herbicides and fungicides can improve production efficiency; however, there is little information on the effect of these mixtures on weed control and processing tomato crop response. Six field trials were conducted from 2002 to 2004 in Ontario to study the effect of rimsulfuron and thifensulfuron applied alone or in combination with metribuzin and with or without chlorothalonil or copper fungicides on processing tomato. There was no visual injury or reduction in marketable yield of processing tomato with rimsulfuron or thifensulfuron alone or when tank-mixed with chlorothalonil or copper hydroxide. Rimsulfuron, thifensulfuron, rimsulfuron plus metribuzin, and thifensulfuron plus metribuzin could be tank-mixed with chlorothalonil without a reduction in weed control. However, efficacy of rimsulfuron and thifensulfuron were reduced when tank-mixed with copper hydroxide. The reduction in weed control incited by adding copper hydroxide was overcome with a low rate (150 g·ha–1 a.i.) of metribuzin for thifensulfuron but not rimsulfuron. Application of rimsulfuron and thifensulfuron alone or with low rates of metribuzin and chlorothalonil could provide tomato growers with a single-pass treatment for the control of troublesome weeds and diseases.

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

Bewick, 1992 ), primisulfuron ( O'Sullivan and Sikkema, 2002 ), isoxaflutole ( O'Sullivan et al., 2001 ), and thifensulfuron-methyl ( Soltani et al., 2005b ). Before pyroxasulfone can be registered for use in sweet corn, hybrid sensitivity must be

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

mays ) hybrids responses to thifensulfuron-methyl HortScience 40 1381 1383 Soltani, N. Sikkema, P.H. Zandstra, J. O’Sullivan, J. Robinson, D.E. 2007 Response of eight sweet corn ( Zea mays L.) hybrids to topramezone HortScience 42 110 112 Taylor

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

, N.C Statistical Analysis Systems Institute Soltani, N. Sikkema, P.H. Robinson, D.E. 2005 Sweet corn ( Zea mays ) hybrids responses to thifensulfuron-methyl HortScience 40 1381 1383 Van