According to the label From the product label
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EPA registration data for Reg. 62719-387 →
Dithane M45 is a fungicide used to control various fungal diseases in a wide range of crops, including field crops, fruits, vegetables, and miscellaneous crops. The active ingredient is mancozeb (40%), which acts as a protectant. It is used both as a foliar spray and as a seed treatment. For foliar applications, it can be applied via sprayer, including aerial application, though specific rates and equipment requirements apply. For seed treatment, it is used to control diseases like smut or damping-off. When handling, users must wear personal protective equipment (PPE) including long-sleeved shirts, long pants, shoes and socks, and chemical-resistant gloves. If using a dust mask, a NIOSH-approved respirator with a dust filter is required. Users should avoid contact with eyes, skin, or clothing. Always follow specific application rates for each crop to avoid exceeding maximum allowed active ingredient levels per acre. Always read the full label for specific timing and weather restrictions.
Pests covered (8)
blossom blight (Monilia spp.)shothole (Spilocarpum spp.)common corn rustheminthosporium leaf blightcercospora leaf spot rustalternaria leaf spotcommon rustanthracnose
Areas treatable (9)
AlmondBarleyBarley (hybrid corn)PeanutAsparagusBroccoli/CabbageCornPapayaCherimoya
How to treat each type of area 10
Almond
| Target pest |
Location |
Rate |
Unit |
| blossom blight (Monilia spp.) |
Outdoor |
6 |
lb/acre |
| shothole (Spilocarpum spp.) |
Outdoor |
6 |
lb/acre |
Barley
| Target pest |
Location |
Rate |
Unit |
| common corn rust |
Outdoor |
1.5 |
lb/acre |
Barley (hybrid corn)
| Target pest |
Location |
Rate |
Unit |
| heminthosporium leaf blight |
Outdoor |
1.5 |
lb/acre |
Peanut
| Target pest |
Location |
Rate |
Unit |
| cercospora leaf spot rust |
Outdoor |
1-2 |
lb/acre |
Asparagus
| Target pest |
Location |
Rate |
Unit |
| cercospora leaf spot rust |
Outdoor |
2 |
lb/acre |
Broccoli/Cabbage
| Target pest |
Location |
Rate |
Unit |
| alternaria leaf spot |
Outdoor |
2 |
lb/acre |
Corn
| Target pest |
Location |
Rate |
Unit |
| common rust |
Outdoor |
1.5 |
lb/acre |
Papaya
| Target pest |
Location |
Rate |
Unit |
| anthracnose |
Outdoor |
2-2.5 |
lb/acre |
Cherimoya
| Target pest |
Location |
Rate |
Unit |
| anthracnose |
Outdoor |
2-2.3 |
lb/acre |
Mixing instructions 3
| For pests |
Location |
Amount |
Per |
Label notes |
| Seed Treatment |
Outdoor |
1.3-2 |
oz/bushel |
For barley covered smut |
| Seed Treatment |
Outdoor |
1.5-3 |
oz/bushel |
For corn (field) damping-off |
| Seed Treatment |
Outdoor |
2-4 |
oz/bushel |
For flax damping-off |
Worker safety
Re-entry interval (REI)
7 days (for Almond)
PPE required
Long-sleeved shirt, long pants, shoes and socks, chemical-resistant gloves. If using a dust mask, use a NIOSH-approved respirator with a dust filter (MSHA/NIOSH approved prefix TC-21 or any N, R, P or HE filter).
Timing & weather
- Apply at flowering and continue at 7-14 day re-treatment intervals for some fruits.
- Avoid application if heavy rains are expected.
Use restrictions 3
- Do not exceed maximum allowed active ingredient per acre per season.
- Do not graze livestock in treated areas for certain crops.
- Do not apply within certain days of harvest (Preharvest Interval).