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Cucumber, Pumpkin, Squash - Home Use Fungicides


Fungicides registered for HOME use on Cucurbits (Cucumber, Squash, & Melons), organized by Mode of Action (MoA). For treatment on other cucurbits, always check the label first.

Active Ingredient Brand Name MoA Residual Days Powdery Mildew Gummy Stem/ Black Rot
copper Natural Guard Copper SoapB, Monterey Liqui-CopB M1 5 X  
sulfur + pyrethrins Natria Insect Disease & Mite ControlB, Bonide Tomato & Vegetable 3-in-1B M2/ 3A 5-7 X  
chlorothalonil Fertilome Broad Spectrum Landscape & Garden Fungicide, Hi Yield Vegetable, Flower Fruit & Ornamental Fungicide, Ortho Max Garden Disease Control M5 7-14 X X
myclobutanil Fertilome F-Stop Lawn & Garden, Spectracide Immunox Multi-Purpose Fungicide 3 10-14 X  
potassium salts of fatty acid Safer Brand Tomato & Vegetable 3-in-1B 44   X  
Bacillus subtilis
strain QST 713
Serenade Garden DiseaseOB NC 5-7 X  
oil: mineral-based Bonide All Season Horticultural OilB NC 1 X X
oils: plant-based oils Monterey All Natural 3-in-1B, Arborjet Eco-1 Fruit & Vegetable SprayOB NC 1 X  

Note: All brands are registered trademarks. The brands listed in this table are not all-inclusive, but are meant to provide examples of products for these crops in Utah. Always check the label for the specific crop you are treating, application and safety information, and protection and pre-harvest intervals.


B= Biopesticide
O= Organic
R=Restricted Use