Home Garden Fungicides

Fungicides like chlorothalonil, mancozeb, and copper can be applied to prevent late blight infection in tomatoes

Fungicides like chlorothalonil, mancozeb, and copper can be applied to prevent late blight infection in tomatoes

Amanda Gevens, Ken Cleveland and Lauren Thomas, UW Madison – Plant Pathology
Revised:  5/30/2012
Item 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

VEGETABLE

DISEASE(S)

ACTIVE INGREDIENT

BRAND NAMES

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

Streptomyces lydicus*

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.

University of Wisconsin-Extension