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- Title
Winter Wheat Yields Are Increased by Seed Treatment and Fall-Applied Fungicide.
- Authors
Turkington, T. Kelly; Beres, Brian L.; Kutcher, H. Randy; Irvine, Byron; Johnson, Eric N.; O'Donovan, John T.; Harker, K. Neil; Holzapfel, Christopher B.; Mohr, Ramona; Peng, Gary; Craig Stevenson, F.
- Abstract
Poor stand establishment resulting in lower yield is a major constraint to expanding winter wheat (Triticum aestivum L.) land area across the semiarid temperate regions of the northern Great Plains. We conducted a direct-seeded study at nine sites across western Canada totaling 26 environments (site-years) over three growing seasons (2011-2013) to observe the responses of the winter wheat cultivar CDC Buteo to fi ve levels of seed treatment (i) Check-no seed treatment, (ii) tebuconozole [(RS)- 1-(4-Chlorophenyl)-4,4- dimethyl-3-(1H, 1,2,4-triazol-1-ylmethyl)pentan- 3-ol], (iii) metalxyl {2-[(2,6-dimethylphenyl)-(2-methoxy-1-oxoethyl) amino} propanoic acid methyl ester], (iv) imidacloprid (N-{1-[(6-Chloro-3-pyridyl)ha-1 methyl]-4,5-dihydroimidazol-2-yl}nitramide), and (v) dual fungicide/ insecticidal seed treatment: tebuconozole, + metalxyl + imidacloprid; and two levels of fall-applied fungicide (i) Check-no application or (ii) foliar-applied prothioconazole {2-[2-(1-chlorocyclopropyl)-3-(2- chlorophenyl)-2-hydroxypropyl]-1H-1,2,4-triazole-3-thione} performed in mid-October. Th e check and the fungicide seed treatment, metalaxyl, produced similarly low grain yield resulting in lower net returns, whereas the dual fungicide/insecticide seed treatment provided the highest yield and net returns (CAN+$13 ha-1). Fall-applied fungicide improved yield (0.06 Mg ha-1), but decreased net returns (-$12 ha-1). Plant density increased slightly (13 plants m-2) when seed treatments included the insecticide component, imidacloprid. Fall foliar fungicides generally improved spring plant density; however, no benefi t was observed in seed treatments containing imidacloprid. Greater yield and plant stand stability was observed with fall-applied foliar fungicide applications; however, fall foliar would be cost prohibitive. Th e benefi ts of a fall foliar fungicide application requires further exploration in the context of an added input or as an alternative to a spring application as the net returns of a fall foliar compared to no application in the system render the input cost-prohibitive.
- Subjects
WINTER wheat; PLANT yields; PLANT productivity; SEED treatment; FUNGICIDES
- Publication
Agronomy Journal, 2016, Vol 108, Issue 4, p1379
- ISSN
0002-1962
- Publication type
Article
- DOI
10.2134/agronj2015.0573