| Autor: |
Baldwin, Ford, Santelmann, Paul, Greer, Howard |
| Zdroj: |
Agronomy Journal; November 1974, Vol. 66 Issue: 6 p789-792, 4p |
| Abstrakt: |
Hophornbeam copperleaf (Acalypha ostraefoliaRidd), an increasing weed problem in peanuts (Arachis hypogaeaL.) 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. |
| Databáze: |
Supplemental Index |
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