2001 Florida Citrus Pest Management Guide: Citrus Root Sprouts

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2001 Florida Citrus Pest Management Guide: Citrus Root Sprouts
Physical Description:
Fact sheet
Noling, Joseph W.
University of Florida Cooperative Extension Service, Institute of Food and Agriculture Sciences, EDIS
Place of Publication:
Gainesville, Fla.
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Collected for University of Florida's Institutional Repository by the UFIR Self-Submittal tool. Submitted by Melanie Mercer.
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General Note:
"Date printed: December 1995. Date revised: October 2000."
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University of Florida Institutional Repository
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University of Florida
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ENY607 2001 Florida Citrus Pest Management Guide: Citrus Root Sprouts1 J.W. Noling2 1. This document is Fact Sheet ENY-607, part of the 2001 Florida Citrus Pest Management Guide, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida. Date printed: December 1995. Date revised: October 2000. For a copy of this handbook, request information on its purchase at your county extension office. Please visit the EDIS Web site at http://edis.ifas.ufl.edu. 2. J.W. Noling, associate professor, nematologist, Entomology and Nematology Department; Citrus REC, Lake Alfred, Florida, a branch campus of the University of Florida; Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, 32611. The use of trade names in this publication is solely for the purpose of providing specific information. It is not a guarantee or warranty of the products named, and does not signify that they are approved to the exclusion of others of suitable composition. The Institute of Food and Agricultural Sciences is an equal opportunity/affirmative action employer authorized to provide research, educational information and other services only to individuals and institutions that function without regard to race, color, sex, age, handicap, or national origin. For information on obtaining other extension publications, contact your county Cooperative Extension Service office. Florida Cooperative Extension Service/Institute of Food and Agricultural Sciences/University of Florida/Christine Taylor Waddill, Dean. Root sprouts are outgrowths of severed portions of root systems of trees which have been removed. In addition to their competitive effects with newly planted trees for water, nutrients and light, they may also serve as hosts for many important soil borne pests and diseases, i.e., nematodes, insects and fungi. All of these can have a negative impact on early tree growth. Some rootstocks such as rough lemon and Cleopatra mandarin are more prone to sprouting than others such as sour orange. Tree shearing machines which sever the trunk near the soil surface have intensified sprouting, particularly when compared with more traditional uprooting methods. To minimize sprouting after tree removal, as much as possible of the root system should be removed from the site by multiple rakings. When trees are sheared, care should be exercised to avoid breakage of major roots since such severed roots interfere with the translocation of systemic herbicides. As herbicidal control of root sprouts has not been highly effective and herbicides can injure adjacent, recently planted trees, sprout control should rely more on good site preparation and a delay in planting until adequate sprout control is achieved. Recommended Chemical Controls READ THE LABEL. See Table 1. Rates for pesticides are given as the maximum amount required to treat mature citrus trees unless otherwise noted. To treat smaller trees with commercial application equipment including handguns, mix the per acre rate for mature trees in 250 gallons of water. Calibrate and arrange nozzles to deliver thorough distribution and treat as many acres as this volume of spray allows.


2001 Florida Citrus Pest Management Guide: Citrus Root Sprouts 2 Table 1. Recommended Chemical Controls for Citrus root sprouts Herbicide bromide (Fumigant) Application Comments Methyl bromide; For use in all grove replant areas. Refer to Nematodes, Table 1. Use only as a preplant treatment. Allow 14 days prior to planting. Do not apply within 10 ft of existing tree trunk to avoid damage. Custom application suggested. Weedone CB; For use in fallow grove land and grove areas around nonbearing trees only. Apply Weedone CB (undiluted) as a basal girdling treatment to lower 1/3 of sprout stem(s). Good coverage is necessary without allowing product to puddle on soil surface. Use hand-held application equipment with single, low volume nozzle. Do not apply as broadcast treatment. Do not allow spray or spray drift to contact foliage, bark or root zone areas of desirable trees. CAUTION:This product will severely damage or kill citrus trees. Do not use under high temperature conditions in late spring and summer as product will volatilize off soil surface. May result in applicator skin and eye irritation.