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ARS Home » Southeast Area » Tifton, Georgia » Crop Protection and Management Research » Research » Publications at this Location » Publication #109156
Title: ANNUAL GRASS CONTROL WITH PREPLANT INCORPORATED AND PREEMERGENCE APPLICATIONS OF ETHALFLURALIN AND PENDIMETHALIN IN PEANUT (ARACHIS HYPOGAEA).

Author
item PROSTKO, E - UNIVERSITY OF GEORGIA
item Johnson, Wiley - Carroll
item MULLINIX, JR., B - UNIVERSITY OF GEORGIA

Submitted to: Weed Technology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/27/2000
Publication Date: 2/17/2001
Citation: Prostko, E.P., Johnson, W.C., Mullinix, Jr., B.G. 2001. Annual grass control with preplant incorporated and preemergence applications of ethalfluralin and pendimethalin in peanut (Arachis hypogaea). Weed Technology. 15:36-41.

Interpretive Summary: Ethalfluralin and pendimethalin are dinitroaniline herbicides traditionally applied preplant incorporated (PPI) for annual grass control in peanut. Despite the widespread acceptance and use of PPI herbicides in peanut, mechanical incorporation is costly, time consuming, and susceptible to uneven distribution in the soil resulting in poor weed control. With increased emphasis on reducing producing costs and improving peanut production efficiency, alternatives to applying dinitroaniline herbicides PPI were investigated. The effectiveness of preemergence (PRE) applications of ethalfluralin and pendimethalin, activated using irrigation, were compared to the effectiveness of traditional PPI applications in peanut. Results indicated that PRE applications of ethalfluralin and pendimethalin were equally effective as PPI applications in controlling Texas panicum, southern crabgrass, and crowfootgrass. In 1997 and 1998, split PPI/PRE applications of ethalfluralin were more effective than PPI applications in controlling Texas panicum. Sequential applications of clethodim or sethoxydim improved Texas panicum control when efficacy of soil applications of ethalfluralin and pendimethalin were less than 82%. No differences in peanut yield were observed between PPI and PRE applications of either dinitroaniline herbicide. These data show that peanut production costs can be reduced and production efficiency increased by applying dinitroaniline herbicides PRE compared to traditional PPI applications, without reducing weed control.

Technical Abstract: The effectiveness of preemergence (PRE) applications of ethalfluralin and pendimethalin activated using irrigation was compared to the effectiveness of traditional preplant incorporated (PPI) applications in peanut. Results indicated that PRE applications of ethalfluralin and pendimethalin were equally as effective as PPI applications in controlling Texas panicum (Panicum texanum), southern crabgrass (Digitaria cilaris), and crowfootgrass (Dactyloctenium aegyptium). In 1997 and 1998, split PPI/PRE applications of ethalfluralin were more effective than PPI applications in controlling Texas panicum. Sequential applications of clethodim or sethoxydim improved the control of Texas panicum when control from soil applications of ethalfluralin and pendimethalin were less than 82%. No differences in peanut injury and yield were observed between PPI and PRE applications.