IFAS Extension
This document is best viewed as a pdf.
Front: Fungicide table
Credit: UF/IFAS
Table 1. Products recommended in the Florida Citrus Production Guide and their effects on foliar fungal diseases.
|
Pesticidea |
Mode of Actionb (FRAC code) |
REIc Hours |
PHId Days |
Alternaria |
Black Spot |
Greasy Spot |
Melanose |
Postbloom Fruit Drop (PFD) |
Scab |
Maximum Rate per Acre per Season |
|---|---|---|---|---|---|---|---|---|---|---|
|
Amistar Top |
11 + 3 |
12 |
0 |
+++, R |
+++, R |
+++, R |
+++, R |
++, R |
+++ |
61.5 fl oz (Amistar Top) 0.5 lb (difenoconazole) 1.5 lb (azoxystrobin) |
|
Copper fungicide |
M 01 |
See label |
See label |
++, R, NR |
++, R, NR |
+++, R, NR |
+++, R, NR |
- |
++, R, NR |
See label |
|
Copper fungicide + petroleum oil 97% |
M 01, NC |
See label |
See label |
++, NR |
NT |
+++, R , NR |
+++, NR |
- |
- |
See label |
|
Enable 2F |
3 |
12 |
0 |
- |
+++, R |
++, R |
- |
- |
++, R |
24 fl oz 0.38 lb a.i. |
|
Ferbam Granuflo |
M 03 |
24 |
0 |
++, R, NR |
NT |
- |
- |
+, NR |
++, R, NR |
23.7 lb 18 lb a.i. |
|
Gem 500 SC (HR) |
11 |
12 |
7 |
+++, R |
++, R,* |
+++, R,* |
+++, R |
++, R |
+++, R |
15.2 fl oz |
|
Headline SC (HR) |
11 |
12 |
0 |
+++, R |
+++, R,* |
+++, R,* |
+++, R |
++, R |
+++, R |
54 fl oz 0.88 lb a.i. |
|
Gem + Ferbam |
11, M 03 |
24 |
7 |
+++ |
NT |
- |
- |
++, R |
+++ |
15.2 fl oz (Gem) 23.7 lb (Ferbam) 18 lb a.i. (Ferbam) |
|
Headline + Ferbam |
11, M 03 |
24 |
0 |
+++ |
NT |
- |
- |
++, R |
+++ |
54 fl oz (Headline) 0.88 lb a.i. (Headline) 23.7 lb (Ferbam) 18 lb a.i. (Ferbam) |
|
Petroleum oil 97% |
NC |
12 |
0 |
- |
NT |
++, R, NR |
- |
- |
- |
see label |
|
Priaxor Xemium (HR) |
11 + 7 |
12 |
0 |
NT |
NT |
++ |
++ |
++, R |
NT |
44 fl oz (Priaxor) 0.956 lb a.i. (pyraclostrobin) 0.478 lb a.i. (fluxapyroxad) |
|
Pristine (HR) |
11 + 7 |
12 |
0 |
+++, R |
+++, R |
+++, R |
+++, R |
++, R |
+++ |
74 oz (Pristine) 0.592 lb a.i. (pyraclostrobin) 1.17 lb a.i. (boscalid) |
|
Quadris Flowable (HR) |
11 |
4 |
0 |
+++, R |
+++, R,* |
+++, R,* |
+++, R |
++, R |
+++, R |
90 fl oz 1.5 lb a.i. |
|
Quadris + Ferbam |
11, M 03 |
24 |
0 |
+++ |
NT |
- |
- |
++, R |
+++ |
90 fl oz (Quadris) 1.5 lb a.i. (Quadris) 23.7 lb (Ferbam) 18 lb a.i. (Ferbam) |
a All listed pesticides are registered and trademarked products
b Mode of action class for citrus pesticides from the Fungicide Resistance Action Committee (FRAC)
c Restricted Entry Interval
d Preharvest Interval
(R) = Product recommended for control of pathogen in Florida Citrus Production Guide
(NR) = Minimal resistance potential
(NT) = Not tested
(*) = Best applied with petroleum oil
(+++) = good control of pathogen (++) = moderate control of pathogen (+) = low levels of pathogen suppression (-) = no observed control of pathogen (HR) = High resistance potential
Back: Fungicide Resistance Management
Credit: UF/IFAS
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 fungicide applications within a season and all fungal diseases.
- 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 Production Guide (http://www.crec.ifas.ufl.edu/resources/production-guide).
