Abstract

Abstract Under relatively dry soil moisture conditions in cultivated fields, wild oat (Avena fatua L.) populations rose rapidly each season if no control measures were used. Triallate [S‐(2,3,3‐trichloroallyl)diisopropylthiocarbamate] applied in the granular form under these relatively dry conditions gave worthwhile wild oat control by reducing wild oat populations several‐fold and allowing the seeded wheat (Triticum aestivum L. “Neepawa) to double its yield. The best results for wild oat control were from consecutive annual triallate treatments. The 1000‐seed weights of wild oat were less on treated plots (14.8 g) as compared to untreated plots (15.2 g). In particular, soil incorporation of fall‐applied granules was necessary to maintain optimal efficacy on wild oat.

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