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Effects of Grain Sorghum (Sorghum bicolor) Herbicides on Charcoal Rot Fungus

Published online by Cambridge University Press:  12 June 2017

John S. Russin ,
Carol H. Carter  and
James L. Griffin
John S. Russin
Affiliation:
Dep. Plant Pathol. and Crop Physiol., Louisiana Agric. Exp. Stn., Louisiana State Univ. Agric. Cent., Baton Rouge, LA 70803
Carol H. Carter
Affiliation:
Dep. Plant Pathol. and Crop Physiol., Louisiana Agric. Exp. Stn., Louisiana State Univ. Agric. Cent., Baton Rouge, LA 70803
James L. Griffin
Affiliation:
Dep. Plant Pathol. and Crop Physiol., Louisiana Agric. Exp. Stn., Louisiana State Univ. Agric. Cent., Baton Rouge, LA 70803
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Abstract

Laboratory and greenhouse studies examined effects of atrazine, alachlor, and metolachlor on growth and colonization of grain sorghum roots by Macrophomina phaseolina, causal fungus for charcoal rot disease. In laboratory studies, all three herbicides reduced fungal colony diameter and increased production of microsclerotia. Alachlor and metolachlor reduced germination of fungal microsclerotia. Atrazine did not affect microsclerotia germination, but lessened the effects of alachlor and metolachlor on germination when applied in combination. In greenhouse studies, atrazine reduced numbers of M. phaseolina microsclerotia recovered from soil after 8 wk, and this resulted in reduced colonization of roots by this fungus at harvest. Colonization of grain sorghum roots by M. phaseolina was not affected by alachlor or metolachlor. Grain sorghum growth was reduced by atrazine at all intervals and by alachlor and metolachlor at harvest, despite use of seed safened with cyometrinil.

Keywords

Charcoal rot fungus, Macrophomina phaseolina (Tassi) Goid.alachlor, 2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamideatrazine, 6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diaminecyometrinil (Z-α-[(cyanomethoxy)imino]benzeneacetonitrile)metolachlor, 2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamidesorghum, Sorghum bicolor (L.) Moench, ‘Pioneer hybrid 8222.’Fungusmicrosclerotiaplant diseasesoilborne pathogenMacrophomina phaseolina
Type
Research
Information
Weed Technology , Volume 9 , Issue 2 , June 1995 , pp. 343 - 351
Copyright
Copyright © 1995 by the Weed Science Society of America 

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