FUNGICIDES - MODES OF
ACTION
by Roger Bryan
(To read the entire paper, click here)
|
MOA |
CHEMICAL
GROUP |
TRADE
NAME |
TOXICITY |
TYPE |
TYPICAL
APPLICATIONS FOR THE CONTROL OF |
||||
|
C |
W |
D |
S |
T |
C |
||||
|
1 |
Dimethylation
Inhibitors (DMI Fungicides) |
Banner
MAXX |
|
√ |
|
√ |
|
|
Blackspot,
powdery mildew, and rust on roses |
|
Bayleton |
√ |
|
|
√ |
|
|
Powdery
mildew on roses |
||
|
Rubigan |
√ |
|
|
|
√ |
|
Powdery
mildew on roses |
||
|
Eagle |
|
|
|
|
|
|
Blackspot,
powdery mildew, and rust on roses |
||
|
Funginex* |
|
|
√ |
√ |
|
|
Blackspot,
powdery mildew, and rust on roses |
||
|
Immunox |
|
√ |
|
√ |
|
|
Blackspot
and powdery mildew on roses |
||
|
Fertilome
Liquid |
|
√ |
|
√ |
|
|
Blackspot,
powdery mildew, and rust on roses |
||
|
Systhane |
|
√ |
|
√ |
|
|
Blackspot,
powdery mildew, and rust on roses |
||
| Decree 50WDG |
√ |
√ |
Botrytis
on roses
|
||||||
|
2 |
Methyl
Benzimi- |
Cleary’s 3336** |
√ |
|
|
√ |
|
|
Blackspot
and powdery mildew on roses |
|
Fungo |
√ |
|
|
√ |
|
|
Blackspot
and botrytis on roses |
||
|
3 |
Dicarboximides |
Chipco
26019 |
√ |
|
|
|
|
√ |
Botrytis on roses |
|
4 |
Phenylamides |
Subdue
Maxx |
√ |
|
|
√ |
|
|
Root
and stem rot when applied as drench or surface spray |
|
5 |
Quinone
outside Inhibitors (QoI) |
Compass |
√ |
|
|
|
√ |
|
Blackspot,
powdery and downy mildews, botrytis and rust on roses |
|
Heritage |
√ |
|
|
|
√ |
|
Downy
and powdery mildews, rust and leaf spot on roses |
||
|
6 |
Inorganics (Metals) |
Alliette |
√ |
|
|
|
|
√ |
Downy
mildew on roses |
|
Phyton
27 |
|
|
√ |
|
|
√ |
Backspot,
powdery and downy mildews and botrytis on roses |
||
|
Dithiocarbamates |
Fore |
√ |
|
|
|
|
√ |
Blackspot,
leaf spot and rust on roses |
|
|
Manzate** |
√ |
|
|
|
|
√ |
Blackspot
and botrytis on roses |
||
|
Maneb |
√ |
|
|
|
|
√ |
Blackspot,
leaf spot and rust on roses |
||
|
Daconil |
|
|
√ |
|
|
√ |
Blackspot
and botrytis on roses |
||
*Now
called Rose & Shrub Disease Control
Modes
of Action
1.
Inhibits
sterol biosynthesis in membranes
2.
Inhibits
mitosis and cell division
3.
Inhibits
the production of lipids and membrane synthesis
4.
Inhibits
nucleic acid synthesis
5.
Inhibits
respiration
6.
Multi-mode/multi-site
activity – inherently low (or no) risk for buildup of resistance
Toxicity:
C=Caution, W=Warning, D=Danger
Type:
S=Systemic, T=Translaminar (Locally Systemic), C=Contact
Effective
rotation of fungicides requires moving from one MOA to another. Moving from one
chemical group, or trade name within a single MOA will not prevent the fungus’
buildup of resistance to fungicides.