Outdoor & Yard / Products / Fruit tree spray (dormant oil + fungicide)

Fruit tree spray (dormant oil + fungicide) — outdoor safety profile

Moderate risk

Not medical, veterinary, or professional safety advice, and not a substitute for a qualified professional — consult one. Full disclaimer →

What is this product?

Combination fruit tree spray applied during dormant season containing horticultural mineral oil (refined petroleum oil) for overwintering insect/egg control and captan or copper-based fungicide for disease prevention. Mineral oil suffocates insect eggs and scale insects by coating them in an impermeable film. Captan is a broad-spectrum phthalimide fungicide; classified as a probable human carcinogen (EPA Group B2). Copper fungicides (copper sulfate, Bordeaux mixture) accumulate in soil with repeated application and are toxic to aquatic organisms. Eye/skin irritant.

What's in it

Click any compound name for its full safety profile, regulatory consensus, and exposure data.

Fungicide

Captan — Phthalimide fungicide. EPA Group B2 (probable human carcinogen). Skin/eye irritant. Degrades rapidly in soil (half-life 1-10 days). EU has restricted use.
Copper sulfate — Inorganic fungicide. OMRI-listed for organic farming but accumulates in soil with repeated use. Toxic to aquatic organisms. Severe eye irritant. Copper soil accumulation can become phytotoxic.

Insecticide

Mineral oils, untreated and mildly treated — Refined petroleum oil. Suffocates insects/eggs. Low mammalian toxicity. Eye irritant. Must be applied during dormancy to avoid phytotoxicity on foliage.

How to use it more safely

Apply during dormant season only
Wear gloves, goggles, and respiratory protection
Follow label dilution rates exactly
Apply when wind is calm

Red flags — when to walk away

Years of copper fungicide use in same soil — Copper accumulates and can reach phytotoxic/environmentally toxic levels

Green flags — what to look for

Mineral oil-only spray (no captan) — Eliminates carcinogenicity concern; effective for insect/egg control alone

Safer alternatives

Sulfur-based fungicide spray — Non-carcinogenic; effective for many fruit tree diseases; does not accumulate in soil like copper
Horticultural oil only (no fungicide) — Effective for overwintering insect control without captan/copper concerns

Frequently asked questions

What's in Fruit tree spray (dormant oil + fungicide)?

This product type can contain: Captan, Copper sulfate, Mineral oil (horticultural), among others. Click any compound name above for the full safety profile.

How can I use Fruit tree spray (dormant oil + fungicide) more safely?

Apply during dormant season only; Wear gloves, goggles, and respiratory protection; Follow label dilution rates exactly

Are there safer alternatives to Fruit tree spray (dormant oil + fungicide)?

Yes — consider: Sulfur-based fungicide spray; Horticultural oil only (no fungicide). See the Safer alternatives section above for details.

Sources (8)

Citations carried on this product's ALETHEIA record. A bracketed number in the text links to its entry here.

ALETHEIA Safety Database — expert_curation
EPA FIFRA — Registered pesticide · USA — regulation
US EPA IRIS: Captan — Cancer Classification B2 (Probable Human Carcinogen), Cancer Slope Factor, and Chronic Reference Dose (1999) (1999) — regulatory (inherited from a compound record)
US EPA: Captan Registration Eligibility Decision — Dietary Risk Assessment, Occupational Exposure, Ecological Risk, and Reregistration Eligibility (2004) (2004) — regulatory (inherited from a compound record)
Copper Sulfate CuSO4 Bluestone Bordeaux Mixture 1882 Millardet Downy Mildew Potato Blight; Cytochrome c Oxidase SOD1 Ceruloplasmin Lysyl Oxidase Essential Cu; Wilson Disease ATP7B Menkes ATP7A; PCB Printed Circuit Board Copper Electroplating Acid Bath; RDA 900 μg/day UL 10 mg/day; Vineyard Soil Accumulation EU 6 kg/ha/year Organic Farming; Indian Childhood Cirrhosis Copper Brass Vessels; Aquatic Biotic Ligand Model BLM EQS; EU CLP Aquatic Acute 1 H400; IARC Not Evaluated Not Carcinogen (2020) — regulatory (inherited from a compound record)
NIOSH Criteria Document: Occupational Exposure to Metalworking Fluids — Mineral Oil Cutting Fluids; PAH Skin Carcinogenicity; Biological Monitoring; Recommendations for Severely Hydrotreated Oils (1998) — regulatory (inherited from a compound record)
IARC Monographs Volume 100F: Mineral Oils (Untreated and Mildly Treated) — Group 1; British Mule Spinner Scrotal Cancer; PAH Content; Hydrotreatment Degree and Carcinogenicity; Highly Refined Oils Group 3 (2012) — iarc_monograph (inherited from a compound record)
US Environmental Protection Agency (EPA) · USA — regulatory

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Reference data, not professional advice. Aggregates publicly available regulatory and scientific information. Why we built ALETHEIA →