Winter cereal responses to dose and application timing of trinexapac‐ethyl

Abstract Trinexapac‐ethyl (TE) is a plant growth regulator commonly used in cereal production systems. It retards by inhibiting gibberellin (GA) biosynthesis, thereby reducing the risk of stem lodging. Lodging at latter stages crop development can compromise grain yield and quality. Thus, application TE may protect quality winter cereals. A field study was conducted from 2014 to 2017 across Canadian Prairies determine effects dose timings on lodging, canopy architecture, yield, treatments consisted 0.6× (60 g a.i. ha −1 ) 1× (100 ), which were applied two wheat ( Triticum aestivum L.) cultivars, 'Flourish’ ‘Moats’, fall rye Secale cereale cultivar ‘Hazlet’, Feekes 5 7 stages. Compared with control, increased 3–8%, reduced height 5–10%, shortened internode length. Plant reductions most notable when rate 7. The responsive rye, could be expected given its tall stature relative cultivars. Most tested environments, including irrigation, did not induce heavy lodging; therefore, observations positive responses absence lodging unexpected. Our findings suggest that there role for systems, provided magnitude justifies added input costs.