Dithane M-45

SouthernAg · Mancozeb · EPA Reg 829-286 · Fungicide Document last checked 2026-05-30

According to the label From the product label

These details were extracted from this product's label PDF. The label is the law. Confirm every rate, site, restriction and safety requirement against the label before mixing or applying. Check for a state supplemental label; a product may be restricted or prohibited in a state or site even when a rate appears below. · EPA registration data for Reg. 829-286 →

Dithane M-45 is a broad-spectrum protectant fungicide used to control various fungal diseases on certain vegetables and ornamentals. The active ingredients are Mancozeb (68%), Ethylene bisdithiocarbamate ion (CHNS) (16%), and Manganese (16%). It is designed to be applied as a spray to prevent disease before symptoms appear. It is primarily used outdoors on crops such as tomatoes, cucumbers, potatoes, grapes, and various ornamentals like roses and begonias. When applying, ensure thorough coverage of plant surfaces. Note that this product may stain concrete and masonry surfaces. Users must follow specific PPE requirements, including chemical-resistant gloves, long-sleeved shirts, pants, shoes, and socks, and must wash hands thoroughly after handling. It is important to avoid application during high wind conditions to prevent drift and to follow specific reentry intervals (REI) for treated areas.

Pests covered (3)

Anthracnose, leaf spot, rotDowny mildew, gummy stem mold, microclimatic blightLate blight, early blight, leaf spot

Areas treatable (4)

ChrysanthemumTomatoCucumberPotato

How to treat each type of area 4

Chrysanthemum

Target pest	Location	Rate	Label notes
Anthracnose, leaf spot, rot	Outdoor	Not specified	Apply when symptoms first appear or in early spring/early summer before infection occurs.

Tomato

Target pest	Location	Rate	Unit	Label notes
Anthracnose, leaf spot, rot	Outdoor	1.5	lb	Apply as a spray. Use 1.5 lb Dithane M-45 per acre. Apply when symptoms first appear or at 7 to 10 day intervals.

Cucumber

Target pest	Location	Rate	Unit	Label notes
Downy mildew, gummy stem mold, microclimatic blight	Outdoor	2 to 3	lb	Apply as a spray. Use 2 to 3 lb Dithane M-45 per acre. Apply when symptoms first appear or at 7 to 10 day intervals.

Potato

Target pest	Location	Rate	Unit	Label notes
Late blight, early blight, leaf spot	Outdoor	1.5	lb	Apply as a spray. Use 1.5 lb Dithane M-45 per acre. Apply when symptoms first appear or at 7 to 10 day intervals.

Mixing instructions 1

For pests	Label notes
General	Use a fixed copper fungicide in tank mix for control of bacterial speck.

Worker safety

Re-entry interval (REI) 24

PPE required Chemical-resistant gloves, long-sleeved shirts, pants, shoes, and socks; wash hands thoroughly after handling; use protective eyewear if necessary.

Timing & weather

Do not apply when wind speeds are greater than 5 mph.
Apply when symptoms first appear or at 7 to 10 day intervals.

Use restrictions 4

Do not apply directly to, or to areas where surface water is present, or on materials across the moving water line.
Do not contaminate water when cleaning equipment or disposing of wastewashings or rinsate.
Do not use on certain crops as specified in the label (e.g., check specific ornamental restrictions).
Do not apply when wind speeds are greater than 5 mph.

Label SDS

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Document text and citations

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Reference only. Always read and follow the most current EPA-approved label on the product container. State and local restrictions may apply that are not reflected in this digitised copy. Verify the EPA registration number and revision date before use.