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Influence of Broadleaf Weeds on Chlorothalonil Deposition, Foliar Disease Incidence, and Peanut (Arachis hypogaea) Yield

Published online by Cambridge University Press:  12 June 2017

Stanley S. Royal ,
Barry J. Brecke ,
Frederick M. Shokes  and
Daniel L. Colvin
Stanley S. Royal
Affiliation:
Zeneca Ag Products, Route 1, Box 117, Whitakers, NC 27891
Barry J. Brecke
Affiliation:
West Florida Research and Education Center, 4253 Experiment Drive, Jay, FL 32565
Frederick M. Shokes
Affiliation:
North Florida Research and Education Center, Rt. 3, Box 4370, Quincy, FL 32351
Daniel L. Colvin
Affiliation:
Department of Agronomy, University of Florida, Gainesville, FL 32611
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Abstract

Field experiments were conducted at Jay and Marianna, FL in 1988 and 1989 to determine the effects of sicklepod, Florida beggarweed, and common cocklebur density on chlorothalonil deposition to peanut foliage, peanut foliar disease incidence, and peanut yield. At a density of four weed plants per 8 m of row, Florida beggarweed and sicklepod reduced chlorothalonil deposition on peanut foliage by 20%, while common cocklebur reduced fungicide deposition by 34%. At the same density, incidence of the foliar diseases early leaf spot and late leaf spot increased 10% with Florida beggarweed, 14% with sicklepod, and 20% with common cocklebur compared with weed-free peanut. The predicted peanut yield loss from a weed density of four plants per 8 m was 16 to 19% for Florida beggarweed, 23 to 25% for sicklepod, and 31 to 39% for common cocklebur. Weed biomass increased with increasing weed density.

Keywords

Chlorothalonil, tetrachloroisophthalonitrilecommon cocklebur, Xanthium strumarium L. # XANSTFlorida beggarweed, Desmodium tortuosum (Sw.) DC. # DEDTOsicklepod, Senna obtusifolia (L.) Irwin and Barneby # CASOBearly leaf spot, Cercospora arachidicola Horilate leaf spot, Cercosporidium personatum (Berk. and Curt.) Deightonpeanut, Arachis hypogaea L. ‘Florunner.’Common cocklebur competitionFlorida beggarweed competitionsicklepod competitionweed competitionweed interferencechlorothalonilDesmodium tortuosumSenna obtusifoliaXanthium strumariumCercospora arachidicolaCercosporidium personatumDEDTOCASOBXANSTAUDRC, area under the disease rating curve
Type
Research
Information
Weed Technology , Volume 11 , Issue 1 , March 1997 , pp. 51 - 58
Copyright
Copyright © 1997 by the Weed Science Society of America 

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