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Weed Control Systems for Hophornbeam Copperleaf Control in Peanuts 1
Author(s) -
Baldwin Ford,
Santelmann Paul,
Greer Howard
Publication year - 1974
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1974.00021962006600060021x
Subject(s) - alachlor , arachis hypogaea , weed control , metolachlor , agronomy , acetanilide , weed , row crop , biology , pesticide , agriculture , atrazine , chemistry , organic chemistry , ecology
Hophornbeam copperleaf ( Acalypha ostraefolia Ridd), an increasing weed problem in peanuts ( Arachis hypogaea L.) in the southwestern United States, is resistant to most presently used herbicides. Research was conducted to design and evaluate production systems that would provide full season control of this weed in peanuts. Screening experiments indicated several herbicides would control copperleaf but that they were not selective for peanuts. Preliminary systems utilizing alachlor (2‐chloro‐2',6'‐diethyl‐N‐(methoxymethyl)acetanilide) at 2.24 kg/ha combined with rotary cultivation provided early but not full season control. Ultimately systems involving a preplant herbicide, alachlor or fluorodifen (p‐nitrophenyl α,α,α‐trifluoro 2‐nitro‐p‐totyl ether) either preemergence or with several postemergence combinations, and timely cultivations were developed that controlled copperleaf for the entire growing season. Fluorodifen combinations (at 5 kg/ha) applied postemergence to peanuts and copperleaf up to 7.5 cm tall provided excellent weed control with no visible crop injury.