Tolerance of spring wheat triticum aestivum cultivar neepawa to trifluralin deep incorporated in the autumn or spring

O'sullivan P.A.; Weiss, G.M.; Friesen, D.

Weed Research 25(4): 275-280


ISSN/ISBN: 0043-1737
Accession: 006812173

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Field experiments at Lacombe ha-1 in the autumn or spring and incorporated to a depth of 10 cm. Rates of trifluralin > 1.0 kg ai ha-1 applied in the autumn or spring reduced the percent stand of wheat compared to an untreated control. Two weeks after emergence the crop showed 37 or 47% injury indicated by delayed growth, following application at 1.0 kg ai ha-1 in the autumn or spring, respectively. The wheat recovered throughout the course of the growing season. At harvest, trifluralin applied in the autumn or spring at rates < 1.0 kg ai ha-1 caused a yield increase, while higher rates caused a yield decrease compared to the untreated control. Spring application caused a greater yield loss than autumn application. The tolerance of spring wheat to trifluralin at rates required for weed control (1.1 kg ai ha-1 or higher) on this soil type is marginal.