Broad Mites and Russet Mites: How to Identify and Treat Them

Broad mites and russet mites are some of the most frustrating pests a grower can face. They are too small to see with the naked eye, they leave no webbing, and by the time most people notice something is wrong, the damage has already spread across the canopy. This guide shows you how to recognize them, how to confirm what you are dealing with, and how to set up a spray schedule that keeps hitting them until the population collapses.

Ready to treat? See Green Cleaner spider mite, aphid and powdery mildew control. More guides are in the IPM Learning Center.

What are broad mites and russet mites?

Both are microscopic mites that feed on plant tissue. They are much smaller than spider mites, so you need a jeweler's loupe (30x-60x) or a microscope to see them. They move from plant to plant on hands, tools, clothing, air movement and new clones or transplants, which is why an outbreak often starts with a single plant brought in from somewhere else.

Broad mite signs

• New growth that is twisted, curled or puckered
• Leaves that look glossy, wet or "plastic" at the growing tips
• Stunted tops and blistered or deformed leaf edges
• Damage that starts at the newest growth and works down

Russet mite signs

• Bronzing, rusty or dull-gray leaf surfaces
• Edges of lower leaves curling upward
• Damage that starts low on the plant and climbs
• Brittle, dry-looking leaves and, on tomatoes, bronzed stems and fruit

Broad mites vs russet mites vs spider mites

If you see twisted tips and no webbing, check for broad mites. If you see bronzing that climbs up from the bottom, check for russet mites. A loupe check on the undersides of leaves and along the stems will confirm it.

Why one spray is not enough

Like other mites, broad and russet mites reproduce quickly, and eggs and hidden stages are easy to miss. A single application almost never reaches every mite. The fix is a short, aggressive schedule followed by close scouting.

Treating broad and russet mites with Green Cleaner

Green Cleaner is a 25(b) minimum-risk concentrate labeled for spider mites, broad and russet mites, aphids, thrips, whiteflies, powdery mildew and fungus gnats. It can be used on all food and feed crops.

Before you mix

1. Shake the bottle well.
2. Add water to your sprayer first, then add Green Cleaner.
3. Mix Green Cleaner with water only. Do not combine it with other products.
4. Use mixed solution within 24 hours.

Heavy infestation schedule (vegetative growth)

• Day 1: 2 oz per gallon
• Day 2: 1 oz per gallon
• Day 3: 1/2 oz per gallon, if needed

Normal infestation or follow-up

• First application: 1 oz per gallon
• Next application: 1/2 oz per gallon

Coverage matters more than anything. Broad and russet mites hide in the tightest spots. Spray the undersides of leaves, the growing tips, along the stems, and where leaf stems meet the main stalk. Spray until every surface is wet.

Re-entry: once the spray has dried.

If you find mites in flower

• Use 1 oz per gallon maximum.
• Spot treat the affected areas instead of spraying the whole plant.
• Rinse the treated areas with plain water after about an hour.

The best plan is to catch broad and russet mites before flower, which is why scouting matters in vegetative growth.

Prevention checklist

• Quarantine new plants and clones for at least a week and inspect them with a loupe.
• Scout weekly with a loupe, focusing on new tips (broad mites) and lower leaves and stems (russet mites).
• Work clean. Visit healthy plants before infested ones and wash hands and tools between rooms.
• Remove badly damaged plants that are spreading mites to the rest of the grow.
• Keep records of where you found mites and what you sprayed.

Frequently asked questions

What kills broad mites?

A contact spray that reaches every mite, applied on a repeat schedule. Green Cleaner is labeled for broad mites. For active outbreaks use the heavy infestation schedule: Day 1 2 oz/gal, Day 2 1 oz/gal, Day 3 1/2 oz/gal if needed.

Can I see broad mites without a microscope?

Usually not. Use a 30x-60x loupe and check new growth.

Are russet mites the same as hemp russet mites or tomato russet mites?

They are closely related eriophyid mites with similar damage patterns: bronzing and upward curling. The scouting and spray approach is the same.

How long does Green Cleaner last?

Sealed product does not expire. Once opened, use it within 1 year. Mixed solution is good for 24 hours.

Get help

Not sure what you are seeing? Send a close-up photo to info@centralcoastgarden.com or call (831) 757-4733. Shop Green Cleaner. Related: How to get rid of spider mites · Green Cleaner mixing chart · IPM Learning Center