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Effect of Selected Pesticides on Conidial Germination and Mycelial Growth of Dactylaria higginsii, a Potential Bioherbicide for Purple Nutsedge (Cyperus rotundus)

Published online by Cambridge University Press:  20 January 2017

Camilla B. Yandoc ,
E. N. Rosskopf ,
R.L.C.M. Pitelli  and
R. Charudattan
Camilla B. Yandoc
Affiliation:
U.S. Department of Agriculture, Agricultural Research Service, U.S. Horticultural Research Laboratory, 2001 South Rock Road, Fort Pierce, FL 34945
E. N. Rosskopf*
Affiliation:
U.S. Department of Agriculture, Agricultural Research Service, U.S. Horticultural Research Laboratory, 2001 South Rock Road, Fort Pierce, FL 34945
R.L.C.M. Pitelli
Affiliation:
Plant Pathology Department, University of Florida, Gainesville, FL 32611
R. Charudattan
Affiliation:
Plant Pathology Department, University of Florida, Gainesville, FL 32611
*
Corresponding author's E-mail: ERosskopf@ushrl.ars.usda.gov
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Abstract

The suitability of a bioherbicide as a component of an integrated weed management program not only relies on its field efficacy, but also on its compatibility with other pest control measures that may be employed during the cropping season. The effects of selected pesticides applied according to label rates on Dactylaria higginsii, a biological control agent for purple nutsedge, were determined using mycelial growth on pesticide-amended potato dextrose agar (PDA) and conidial germination as indicators of pesticide sensitivity. Among the pesticides tested, the herbicides oxyfluorfen and sethoxydim and the fungicides fosetyl-Al and thiophanate methyl inhibited D. higginsii mycelial growth and reduced or completely inhibited conidial germination; the herbicide diuron, the fungicides metalaxyl and copper hydroxide, and the insecticide cyromazine reduced mycelial growth but did not reduce conidial germination. The miticide dicofol reduced mycelial growth and completely inhibited conidial germination while the herbicide imazapyr had no adverse effect on either the mycelial growth or conidial germination of D. higginsii.

Keywords

Copper hydroxidecyromazinedicofoldiuronfosetyl-Al, Aluminum tris (ethyl phosphonate)imazapyrmetalaxyloxyfluorfensethoxydimthiophanate methylpurple nutsedge, Cyperus rotundus L. #3 CYPRO, Dactylaria higginsii (Lutrell) M. B. EllisBiological controlbioherbicidepesticide sensitivityconidial germinationCRD, complete randomized designRPA, rice polish agar
Type
Research Article
Information
Weed Technology , Volume 20 , Issue 1 , March 2006 , pp. 255 - 260
Copyright
Copyright © Weed Science Society of America 

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