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Influence of Fertilizer Particle Size on Efficacy of Dithiopyr, Prodiamine, Oryzalin, and Oxadiazon for Southern Crabgrass (Digitaria ciliaris) Control

Published online by Cambridge University Press:  12 June 2017

Steven T. Kelly*
Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS 39762
G. Euel Coats
Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS 39762
Corresponding author's E-mail:


A commercial fertilizer (40-0-0, N-P-K) was screened into seven particle size fractions (23, 58, 165, 465, 1,310, 3,728, or 10,606 particles/g) and coated with dithiopyr (0.345%, wt/wt), prodiamine (0.689%), oryzalin (3.28%), or oxadiazon (2.76%). Dithiopyr and oryzalin provided best southern crabgrass control with a fertilizer size of 465 particles/g or greater, whereas prodiamine controlled southern crabgrass greatest using a size fraction at least 165 particles/g. Southern crabgrass control with oxadiazon was not as dependent on particle size, with all fraction sizes of 58 or 165 particles/g or greater controlling southern crabgrass equally in 1995 or 1996, respectively.

Copyright © 1999 by the Weed Science Society of America 

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Approved for publication as Journal Article J9428 of the Mississippi Agricultural and Forest Experiment Station, Mississippi State University.


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