University of FloridaSolutions for Your Life

Download PDF
Publication #PP275

Quick Reference Guide for Foliar Fungicides1

Megan M. Dewdney2

This reference guide provides quick access to foliar fungicide recommendations from the Florida Citrus Pest Management Guide. Also included are guidelines for fungicide resistance management.

Figure 1. 

Download PDF: http://edis.ifas.ufl.edu/pdffiles/pp/pp27500.pdf


[Click thumbnail to enlarge.]

Fungicide Resistance Management

Fungicide resistance is now problematic in Florida citrus groves, with documented strobilurin resistance causing control failure of Alternaria brown spot. These guidelines apply to all fungicides.

  • Make no more than the recommended number of sequential applications of any fungicide without alternating to another fungicide with a different mode of action (FRAC codes). To conserve fungicide efficacy, it is recommended to rotate modes of action with each application.

  • Do not make more than the maximum number of applications of any fungicide class combined in a year for all diseases, and never exceed maximum label rates per acre per year.

  • Control measures should begin before disease development and continue as indicated by recommended disease management practices. For guidance, consult the Florida Citrus Pest Management Guide (http://www.crec.ifas.ufl.edu/extension/pest/).

Tables

Table 1. 

Pesticidea

Target pathogen

Maximum rate

per acre per season

Mode of actionb

(FRAC code)

REIc

PHId

Alternaria

Black Spot

Greasy spot

Melanose

Postbloom fruit drop (PFD)

Scab

Abound 2.08F

11

4 hours

0

+++, R

NT, R

+++, R

+++, R

++, R

+++, R

92.3 fl oz

1.5 lb a.i.

Copper fungicide

M1

See label

See label

++, R

NT, R

+++, R

+++, R

-

++, R

None

Enable 2F

3

12 hours

0

-

NT

++, R

-

-

++, R

24 fl oz

0.38 lb a.i.

Ferbam Granuflo

M3

24 hours

1 day

++, R, NR

NT

-

-

+, NR

++, R, NR

None

Gem 500 SC

11

12 hours

7 days

+++, R

NT, R

+++, R

+++, R

++, R

+++, R

15.2 fl oz

Headline SC

11

12 hours

0

+++, R

NT, R

+++, R

+++, R

++, R

+++, R

54 fl oz

0.88 lb a.i.

Copper fungicide + petroleum oil 97 + %

M1 & NR

See label

See label

++, NR

NT

+++, R , NR

+++, NR

-

++, NR

None

Petroleum oil 97 + %

NR

12 hours

0

-

NT

+++, R, NR

-

-

-

None

Abound 2.08F + Ferbam

11, M3

24 hours

1 day

+++

NT

-

-

++, R

+++

92.3 fl oz (Abound)

1.5 lb a.i. (Abound)

Gem + Ferbam

11, M3

24 hours

7 days

+++

NT

-

-

++, R

+++

15.2 fl oz (Gem)

Headline + Ferbam

11, M3

24 hours

1

+++

NT

-

-

++, R

+++

54 fl oz (Headline)

0.88 lb a.i. (Headline)

Pristine

7,11

12 hours

0

+++, R

NT

+++, R

+++, R

NT

+++

74 oz (Pristine)

0.88 lb a.i. (pyraclostrobin)

Quadris Top

11,3

12 hours

0

+++, R

NT

+++, R

+++, R

NT

+++

61.5 fl oz (Quadris Top)

0.5 lb (difenoconazole)

1.5 lb (azoxystrobin)

(+++) = Good control of pathogen (++) = Moderate control of pathogen (+) = Low levels of pest suppression (-) = No observed control of pathogen

aAll listed pesticides are registered and trademarked products

bMode of action class for citrus pesticides from the Fungicide Resistance Action Committee (FRAC)

cRestricted Entry Interval

dPreharvest Interval

(R) = Product recommended for control of pathogen in Florida Citrus Pest Management Guide

(NR) = Minimal resistance potential

(NT) = Not tested

Footnotes

1.

This document is PP275, one of a series of the Plant Pathology Department, UF/IFAS Extension. Original publication date May 2010. Revised January 2014. Visit the EDIS website at http://edis.ifas.ufl.edu.

2.

Megan M. Dewdney, assistant professor, Department of Plant Pathology, Citrus REC, Lake Alfred, Florida; Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL 32611


The Institute of Food and Agricultural Sciences (IFAS) is an Equal Opportunity Institution authorized to provide research, educational information and other services only to individuals and institutions that function with non-discrimination with respect to race, creed, color, religion, age, disability, sex, sexual orientation, marital status, national origin, political opinions or affiliations. For more information on obtaining other UF/IFAS Extension publications, contact your county's UF/IFAS Extension office.

U.S. Department of Agriculture, UF/IFAS Extension Service, University of Florida, IFAS, Florida A & M University Cooperative Extension Program, and Boards of County Commissioners Cooperating. Nick T. Place, dean for UF/IFAS Extension.