Response of Three Potato Cultivars to Metribuzin

Abstract

Metribuzin is the herbicide of choice by potato ( Solanum tuberosum L.) growers and they need information on the response of newly released cultivars to this herbicide. This study was conducted to determine the response of three new potato cultivars ‘AC Novachip’, ‘Belmont’, and ‘Russet Norkotah’ to metribuzin. The effects of metribuzin applied at 0.89 lb/acre pre‐ or postemergence, on plant injury and tuber yield were compared to a hand‐weeded check. Yields of Belmont were not affected by metribuzin applications. Pre‐ and post‐application of metribuzin reduced both Canada no. 1 and total yields of Russet Norkotah in 1990. Total yields of AC Novachip were reduced in some years with metribuzin applied postemergence. The results suggest that metribuzin can safely be applied pre and postemergence to Belmont. Research Question Tolerance to metribuzin varies among potato cultivars. The objective of this study was to determine the response of three new varieties; ‘AC Novachip’, ‘Belmont’, and ‘Russet Norkotah’ to metribuzin. Literature summary Metribuzin is a popular herbicide used to control broadleaf weeds and annual grasses in most potato production areas in North America. Potato cultivars often show differences in tolerance to metribuzin. As new cultivars are released, it is important for growers know their response to metribuzin to avoid injury and yield loss. Study Description This study was conducted from 1989 to 1991 at the Agriculture and Agri‐Food Canada, Research Centre, Charlottetown, Prince Edward Island, Canada. Soil: sandy loam Cultivars: AC Novachip, Belmont, Russet Norkotah, Metribuzin treatments: Pre—0.89 lb ai/acre Post—0.89 lb ai/acre Applied Questions Can metribuzin be used safely as a pre‐ or post‐emergence herbicide on the new potato cultivars AC Novachip, Belmont, and Russet Norkotah? Metribuzin applied pre‐emergence or postemergence reduced the Canada no. 1 yield in 1 of 3 yr for Russet Norkotah. When applied pre‐ or postemergence to AC Novachip or Belmont, no yield reductions occurred with metribuzin (Table ) Canada no. 1† yields of three potato cultivars from metribuzin treatments Tuber yields (cwt/acre) Canada no. 1 Metribuzin Cultivar treatment‡ 1989 1990 1991 AC Novachip Pre 307 357 314 post 251 337 323 hand‐weeded 293 346 261 Belmont Pre 213 257 194 post 212 290 186 hand‐weeded 218 285 184 Russet Norkotah pre 247 320 175 post 260 317 216 hand‐weeded 234 358 150 LSD (P = 0.05) 72 32 45 Canada no. 1 = tubers 2.25−3.5 in. in diameter. Metribuzin applied pre‐emergence or postemergence at 0.89 lb ai/acre.

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