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Tolerance of Sweet Corn (Zea mays) Hybrids to RPA 201772

Published online by Cambridge University Press:  12 June 2017

Lee R. Van Wychen*
Affiliation:
Department of Agronomy, University of Wisconsin, Madison, WI 53706
R. G. Harvey
Affiliation:
Department of Agronomy, University of Wisconsin, Madison, WI 53706
Thomas L. Rabaey
Affiliation:
Pillsbury Agricultural Research, LeSueur, MN 56058-1447
David J. Bach
Affiliation:
Pillsbury Agricultural Research, LeSueur, MN 56058-1447
*
Corresponding author's E-mail: [email protected].

Abstract

Field studies at Arlington, WI, and LeSueur, MN, were conducted in 1996 and 1997 to evaluate tolerance of six sweet corn hybrids to RPA 201772 applied preemergence at 79 to 210 g/ha. Both years the most sensitive hybrid at the Wisconsin site was ‘Zenith,’ with yield reductions of 14 and 22% at 210 g/ha (twice the labeled rate). ‘Excellency,’ ‘Green Giant 43,’ and ‘Jubilee’ tolerated RPA 201772 at 158 g/ha or less. The least tolerant hybrids in Minnesota were ‘Green Giant 6′ and Jubilee, and the most tolerant hybrids were Green Giant 43 and ‘Rogers 9056.’ Injury from RPA 201772 increased as application dose increased. The greatest risk of injury from RPA 201772 appear to be with Green Giant 6, Zenith, and Jubilee, especially on coarser textured soils with low organic matter. Excellency, Green Giant 43, and Rogers 9056 appeared to be the most tolerant. Because of the differential hybrid response to RPA 201772 across sites and years, more hybrid response data needs to be generated before RPA 201772 is labeled in sweet corn.

Type
Research
Copyright
Copyright © 1999 by the Weed Science Society of America 

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