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Influence of Diclosulam Postemergence Application Timing on Weed Control and Peanut Tolerance

Published online by Cambridge University Press:  20 January 2017

Wesley J. Everman ,
Scott B. Clewis ,
Zachary G. Taylor  and
John W. Wilcut
Wesley J. Everman
Affiliation:
P.O. Box 7620, Crop Science Department, North Carolina State University, Raleigh, NC 27695–7620
Scott B. Clewis
Affiliation:
P.O. Box 7620, Crop Science Department, North Carolina State University, Raleigh, NC 27695–7620
Zachary G. Taylor
Affiliation:
P.O. Box 7620, Crop Science Department, North Carolina State University, Raleigh, NC 27695–7620
John W. Wilcut*
Affiliation:
P.O. Box 7620, Crop Science Department, North Carolina State University, Raleigh, NC 27695–7620
*
Corresponding author's E-mail address: john_wilcut@ncsu.edu
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Abstract

Field studies were conducted at Lewiston–Woodville and Rocky Mount, NC in 2001 and 2002 to evaluate weed control and peanut response to POST treatments of diclosulam at various rates and application timings. Diclosulam controlled common ragweed and entireleaf morningglory when applied within 35 d after planting (DAP). Common ragweed 61 cm tall was controlled ≥92% with 4 to 13 g ai/ha diclosulam and larger common ragweed (107 to 137 cm tall) were controlled ≥97% with 27 g/ha diclosulam. Common lambsquarters was controlled 62% or less with all diclosulam POST treatments following metolachlor applied PRE, which provided 48% control. Peanut injury was less than 15% with all diclosulam POST treatments and was transitory. In separate studies, POST diclosulam treatments did not affect peanut yield in a weed-free environment. Peanut yield in weedy environments was reduced as the diclosulam application timing was delayed because of early season weed interference. A linear relationship was observed between yield and application timing with yield decreasing as application timing was delayed. This yield response documents the importance of early season weed management for maximizing peanut yield potential. Virginia peanut varieties were not affected by different POST rates of diclosulam; however, early season peanut injury showed a linear and quadratic relationship with diclosulam rate and was less than 14% at rates as high as 71 g/ha, and was not apparent by late season.

Keywords

Diclosulamcommon lambsquarters, Chenopodium album L. #3 CHEALcommon ragweed, Ambrosia artemisiifolia L. # AMBELentireleaf morningglory, Ipomoea hederacea var. integriuscula Gray # IPOHGpeanut, Arachis hypogaea L., NCV-11, Gregory, Perry, and VA-98 RHerbicide injuryweed controlyielddiclosulamALS, acetolactate synthase (EC 4.1.3.18)COC, crop oil concentrateDAT, days after treatmentEPOST, early POSTNIS, nonionic surfactantRCBD, randomized complete block designWAP, weeks after plantingWAT, weeks after treatment
Type
Research Article
Information
Weed Technology , Volume 20 , Issue 3 , September 2006 , pp. 651 - 657
Copyright
Copyright © Weed Science Society of America 

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