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40oz GreenCure Fungicide

Item #: GC40OZ

Please call us for Special Corporate Pricing. 1-800-517-5970

GreenCure Fungicide is a powder that is mixed with water. Makes between 40 and 80 gallons of spray depending on the mix concentration.

For Use on Ornamentals, Vegetables, Herbs, Fruit Trees, Grapes, Hops and Turf.

Developed by renowned Cornell University plant pathologist, Dr. Ken Horst, GreenCure® is the better, more sensible way to prevent or cure plant diseases.

GreenCure’s® active ingredient, potassium bicarbonate, is commonly used in food production. The patented formula includes spreader-sticker ingredients that enhance the fungicidal properties of the potassium bicarbonate, making it an alternative to more toxic fungicides currently on the market.

GreenCure® treats 25 types of plant diseases and is recommended for use on over 150 different flowers, trees, fruits, vegetables, and turfs. It can be used in organic vegetable production and even indoors.

Product Website
Product Label (PDF)

Note: GreenCure cannot be shipped outside of the United States.

Proven Effectiveness

Dr. Ken HorstExtensive research and successful use in agricultural and commercial settings proves effectiveness

In 1985, renowned plant pathologist, Dr. Ken Horst of Cornell University, began research into the efficacy potential of bicarbonates in controlling plant diseases.

Years of intense research and more than 12 years of successful use in commerical organic growing applications and greenhouse environments have proven the effectiveness of this patented formula.


Advantages of GreenCure®

roseKills powdery mildew and other diseases on contact and provides
up to 2 weeks of residual protection

  • Odorless - no foul smell
  • Fully dissolves in water
  • Sprays on evenly and sticks to
    plant surfaces
  • Fruits & vegetables can be harvested as soon as 1 hour after spraying
  • Does not restrict plant growth
  • Economical
  • It does not accumulate in soil
  • Compatible with many beneficial insects
  • For Organic Production


PLANT TYPES: GreenCure is for: Woody and Ornamental Shade Trees, Woody and Herbaceous Ornamentals, Ornamental Nut and Fruit Trees, Annual and Perennial Flowers, Foliage Plants, Ground Covers and Bedding Plants.

FOR USE ON: Ageratum, Ajuga, Almond-Ornamental,Alyssum, Andromeda, Aphelandra, Apple-Ornamental, Apricot-Ornamental, Artemisia, Aster, Azalea, Begonia, Boxwood, Calendula, Centaurea montana, Cherry-Ornamental, Chrysanthemum, Cineraria, Citrus, Clematis, Crabapple-Ornamental, Coleus, Columbine, Coral Bells (Heuchera), Crape Myrtle, Crassula, Croton, Daylily, Delphinium, Dianthus, Dizygotheca, Dogwood, English Ivy, Episcia, Euonymus, Fern, Fir, Forsythia, Gazania, Geranium, Gerbera daisy, Ginseng, Gladiolus, Gloxinia, Gypsophila, Hawthorn, Heliopsis scabra, Hibiscus, Holly, Hoya, Hydrangea, Impatiens, Iris, India-hawthorn, Juniper, Kalanchoe, Lavender, Lemon balm, Lilac, Lipstick balm, Lipstick vine (Aeschynanthus), Marigold, Monarda (Bee balm), Nectarine-Ornamental, Pachysandra, Palm, Pansy, Peach-Ornamental, Peony, Peperomia, Periwinkle, Philodendron, Photinia, Phlox, Pilea, Pine, Pittosporum, Plum-Ornamental, Poinsettia, Poppy, Pothos, Primrose, Privet, Protea, Prune- Ornamental, Pulmonaria, Pyracantha, Rhododendron, Rose, Rose-of-Sharon, Schefflera, Snapdragon, Spruce, Statice, Tree Ivy, Verbena, Viburnum, Violet, Zinnia.

DISEASES CONTROLLED: Alternaria blight, Anthracnose, Ascochyta blight, Blackspot, Botrytis blight, Botrytis gray mold, Cercospora leaf spot, Corynespora leaf spot, Didymellina leaf spot, Diplodia tip blight, Downy mildew, Entomosporium leaf spot, Fusarium, Helminthosporium leaf spot, Ink spot, Monilinea fruit and blossom rot, Penicillium spp., Phomopsis blight, Powdery mildew, Ovulinia sp., Ramularia leaf spot, Ray blight, Rust, Scab, Septoria leaf spot.


FOR USE ON: Acorn squash, Almonds, Apples, Apricots, Avocado, Basil, Blueberries, Broccoli, Cabbage, Caneberries, Cantaloupe, Cherries, Chicory, Citrus, Crenshaw melon, Cucumber, Dry beans, Eggplant, Endive, Escarole, Grapes, Honeydew, Hops, Kale, Lettuce, Lima bean, Mango, Muskmelon, Mustard greens Okra, Oregano, Peaches, Pears, Peas, Pecans, Peppers, Pistachio, Plums, Potatoes, Prunes, Pumpkin, Radicchio, Rosemary, Sage, Snap beans, Snow peas, Spinach, Strawberries, Summer squash, Sweet potatoes, Thyme, Tomatoes, Turnip, Walnut, Watermelon, Winter squash, Zucchini.

DISEASES CONTROLLED: Alternaria leaf spot, Anthracnose, Botrytis, Cercospora leaf spot, Downy mildew, Fly speck, Fusarium, Monilinea fruit and blossom rot, Penicillium spp., Phoma, Phomopsis blight, Phytophthora, Powdery mildew, Scab, Septoria leaf spot.


GreenCure is for use in the following use sites: Residential lawns and other turf grass sites.

FOR USE ON: Bentgrass, Bermudagrass, Blue grass, (Kentucky,annual), Centipedegrass, Fescue (fine tall, chewings, red), Ryegrass (perennial, annual), St. Augustinegrass, Zoysiagrass.

DISEASES CONTROLLED: Alternaria leaf spot, Anthracnose, Ascochyta blight, Cercospora leaf spot, Dollar Spot, Downy mildew, Helminthosporium leaf spot, Powdery mildew, Septoria leaf spot

Customer Reviews

Posted by: Sam from Silver City, NM
Doesn't kill our bees Lasts longer than others Easy to apply Not so smelly Hoping it continues to work (fungus doesn't develop immunity, as it does with other stuff)
Posted by: Kane from Big Sky, MT
hands down the best treatment for powdery mildew i've ever used. spray confidently days before harvest. no residue, no funky smell, easy to mix, and kills the mildew on contact! It's all i use in my flowering room.
Posted by: Carl from San Diego, Ca
A great product, finally a product that does what is said's it will do.... It really work's!!
Posted by: Denis from Melrose, MA
I tried all kinds of chemical black spot fungus killers on my roses, but none worked like Green Care's fungicide. It's easy to use and clean up is easy too. I highly recommend Green Care Fungicide for all your flower problems.

Free Shipping on $69 or more
If your order totals $69 or more, we will ship your order for free within the continental United States. We currently ship to the United States, including APO and FPO addresses, and Puerto Rico.

Express Shipping Available
If you need your order expedited you can select Express shipping options on the checkout page. Please note that some items are not in stock and the expected number of days prior to shipment is noted on this page.

Northeast Distribution Center
Most products are shipped from the Gearcor warehouse in Conklin, NY within 1 business day (unless otherwise noted) depending on availability and time order was placed. Some products could be shipped from alternate warehouses or a Gearcor retail store. If an out of stock situation occurs, we will contact you to see if you want to "backorder" the item and wait for it to become available.