Home Vegetable Garden Fungicides

Authors: Amanda Gevens, UW-Madison Plant Pathology with contributions by UW-Madison Plant Pathology undergraduates Ken Cleveland and Lauren Thomas
Last Revised: 11/16/2012
X-number: XHT1211

 

Diseases of vegetable plants can pose a challenge for the home gardener.  Typically, cultural methods are the preferred options for disease management in home vegetable gardens.  Cultural methods include proper site selection, plant spacing, staking, watering, fertilization, and perhaps most importantly, use of disease-resistant vegetable cultivars.  However, if diseases become especially problematic, fungicide treatments are also an option for home gardeners.

This guide is intended to help identify some of the common, and most suitable, fungicides available for disease control in home vegetable gardens.  All of the fungicides listed on this fact sheet have been found on shelves at southern Wisconsin home garden centers.  This listing is not intended to be exhaustive, but references fungicides that, when used properly, can be effective in controlling the most common diseases of vegetables grown in home gardens.  When selecting a product from this list, be sure to note the product name carefully, as several products can have very similar names and contain similar active ingredients.  Check that the active ingredient on the label of the product that you select is the ingredient that you are looking for.  Also, be sure to read and follow all label instructions of the fungicide that you select to ensure that you use the product in the safest and most effective manner possible.

VEGETABLE DISEASE(S) ACTIVE INGREDIENT BRAND NAMES
asparagus rust chlorothalonil Daconil, Fung-onil,
Ortho Max Disease Control
mancozeb Mancozeb Flowable
myclobutanil Spectracide Immunox
propiconazole Monterey Fungi Fighter, Infuse
tebuconazole Bayer Advanced 3 in 1,
Bayer Advanced Disease Control
bean rust chlorothalonil Daconil, Fung-onil,
Ortho Max Disease Control
myclobutanil Spectracide Immunox
propiconazole Monterey Fungi Fighter, Infuse
tebuconazole Bayer Advanced 3 in 1, Bayer Advanced Disease Control
carrot

Alternaria leaf blight

 

Cercospora leaf blight

chlorothalonil Daconil, Fung-onil,
Ortho Max Disease Control
copper* Copper Fungicide, Copper Soap,
Dragon Dust, Earth Tone,
Garden Dust
propiconazole Monterey Fungi Fighter, Infuse

cucurbits

 

(cucumber, melon, squash)

downy mildew chlorothalonil Daconil, Fung-onil,
Ortho Max Disease Control
copper* Copper Fungicide, Copper Soap,
Dragon Dust, Earth Tone,
Garden Dust
mancozeb Mancozeb Flowable
phosphorous acids Excel LG-Systemic Fungicide

cucurbits

 

(cucumber, melon, squash)

powdery mildew myclobutanil Spectracide Immunox
neem oil* 70% Neem Oil, Garden Safe,
Natural Guard Neem
other plant-based oils* Vegetable Pharm,
SNS 244 All Natural, Organocide, Oleotrol M
potassium bicarbonate* Green Cure Organic Fungicide
propiconazole Monterey Fungi Fighter, Infuse
sulfur* Dusting sulfur, Earth Tone 3 in 1,
Safer Garden Fungicide
tebuconazole Bayer Advanced 3 in 1,
Bayer Advanced Disease Control
onion downy mildew chlorothalonil Daconil, Fung-onil,
Ortho Max Disease Control
copper* Copper Fungicide, Copper Soap,
Dragon Dust, Earth Tone,
Garden Dust
mancozeb Mancozeb Flowable
phosphorous acids Excel LG-Systemic Fungicide
onion

leaf blight

 

purple blotch

chlorothalonil Daconil, Fung-onil,
Ortho Max Disease Control
mancozeb Mancozeb Flowable
pepper anthracnose chlorothalonil Daconil, Fung-onil,
Ortho Max Disease Control
potato

early blight

 

late blight

chlorothalonil Daconil, Fung-onil,
Ortho Max Disease Control
copper* Copper Fungicide, Copper Soap,
Dragon Dust, Earth Tone,
Garden Dust
mancozeb Mancozeb Flowable
sweet corn

fungal foliar diseases

 

rust

chlorothalonil Daconil, Fung-onil,
Ortho Max Disease Control
mancozeb Mancozeb Flowable
propiconazole Monterey Fungi Fighter, Infuse
tebuconazole Bayer Advanced 3 in 1,
Bayer Advanced Disease Control
tomato

early blight

 

late blight

 

Septoria leaf spot

chlorothalonil Daconil, Fung-onil,
Ortho Max Disease Control
copper* Copper Fungicide, Copper Soap,
Dragon Dust, Earth Tone,
Garden Dust
mancozeb Mancozeb Flowable

vegetables

 

(general)

damping-off

 

Root rot

Streptomyceslydicus* Actino-Iron, Actinovate

vegetables

 

(general)

bacterial diseases

 

(bean bacterial blight, cabbage black rot, cucumber angular leaf spot, onion bacterial blight, pepper bacterial spot, potato blackleg, tomato bacterial spot)

copper* Copper Fungicide, Copper Soap,
Dragon Dust, Earth Tone,
Garden Dust

vegetables

 

(general)

viral diseases

 

(cucumber mosaic virus, tobacco mosaic virus, tomato spotted wilt virus)

none None

*    Active ingredients generally considered ‘organic’.  Certified organic growers must use pesticides approved by their organic certifying agency.

For more information on home vegetable garden fungicides:  Contact your county Extension agent.

University of Wisconsin-Madison