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Rose Garden Pesticides. The Chemicals Available to Keep Your Roses Pest-Free. Today’s Topics. Pesticide Hierarchy Systemic, Translaminar, and Contact Chemicals Identifying the Common Pests Insects Funguses The Available Insecticides and Fungicides Online Sources of Pesticide Labels

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Rose garden pesticides

Rose Garden Pesticides

The Chemicals Available to Keep Your Roses Pest-Free

Today s topics
Today’s Topics

  • Pesticide Hierarchy

  • Systemic, Translaminar, and Contact Chemicals

  • Identifying the Common Pests

    • Insects

    • Funguses

  • The Available Insecticides and Fungicides

    • Online Sources of Pesticide Labels

    • Shopping the Internet for the Best Price

  • A few words about Resistance Management

Today s topics cont
Today’s Topics (Cont.)

  • Specific Chemicals for Specific Pests

    • Insecticides/Miticides

    • Fungicides

  • Ready-to-Use (RTU) and Over-the-Counter (OTC) Products for the Smaller Garden

    • Bayer Advanced Garden Products

    • Others

Systemic chemicals
Systemic Chemicals

  • Apply to the foliage as a spray or to the roots as a drench

  • Moves (typically, up) through the plant’s vascular system

    • Phloem cells – like “arteries” through which sugars and other plant products move

    • Xylem – tubular structure for the transport of water and dissolved minerals --think tree growth rings

  • Chemicals stay within the plant – don’t wash off

  • Downside – systemics don’t enter the blooms

Translaminar chemicals
Translaminar Chemicals

  • Trans = across or through, like transatlantic

  • Laminar = layered

  • Translaminar = through layers

  • Sometimes referred to as locally systemic

  • Applied to foliage as a spray, these chemicals are absorbed by the plant

  • They move through foliage from one surface to the other

  • Great for spider mites which feed on the underside of leaves and are nearly unaffected by systemics

Contact sprays
Contact Sprays

  • Applied to foliage, buds and blooms as a spray

  • Remain on the surface of foliage and blooms

  • Not absorbed by the plant

  • Pretty much the only way to protect blooms

  • Downside – contact sprays wash off in the rain

Identifying the common pests
Identifying the Common Pests

  • Insects

    • Japanese Beetles – May through August – devour blooms and leaves

    • Aphids – entire growing season – attack buds and tender foliage – often accompanied by ants (“farming” the aphids)

    • Thrips – entire growing season – create blemishes on blooms – especially light colors

    • Budworms – later in the growing season – bore holes in buds

    • Spider Mites – when it’s hot and dry – suck the chlorophyll out of leaves – defoliate bushes

Identifying the common pests1
Identifying the Common Pests

  • Funguses

    • Black Spot – all season especially when damp – forms a black spot on leaves which then yellow and fall off

    • Powdery Mildew – all season – superficial white or gray powder on surfaces of leaves – uncontrolled will prevent blooming

    • Downy Mildew – cool with high humidity – purplish red to dark brown irregular spots on leaves – uncontrolled may result in defoliation – long purplish areas on canes - may be systemic in roses

    • Botrytis – all season especially when damp – creates blemishes on blooms, bloom rot and premature shattering

    • Rust – all season – tiny orange and red spots on leaves – looks like rust – uncontrolled can defoliate bush

The available insecticides and fungicides
The Available Insecticides and Fungicides

  • Where to learn about them - other rosarians, ads in rose magazines and newsletters, rose forums on the Internet, and rose care websites like:







    • And links from

Get the labels
Get the Labels

  • And the Material Safety Data Sheets (MSDS)

  • Sources of labels:

    • On the chemicals’ containers

    • Manufacturers’ websites – for example

    • – offers labels and MSDS for all registered pesticides – search by product name

    • – another site like – however, requires simple registration

Read the labels
Read the Labels!

  • And the MSDSs

  • Typical label format:

    • Product name, active ingredients and toxicity – CAUTION, WARNING, or DANGER

    • Safety information – personal protection equipment (PPE), etc.

    • Use restrictions and application instructions

    • Applicable crops/plants – pest/disease that is controlled – application rates

    • Storage and disposal requirements

Resistance management
Resistance Management

  • Resistance management in the garden is a problem akin to certain antibiotics losing their effectiveness in humans due to repeated or improper use

  • Repeated use of the same pesticide allows the target pest to mutate and adapt and become resistant to the pesticide

  • Each insecticide and fungicide has a specific mode of action (MOA) in the way it disables and kills its target pest

  • If these MOAs are alternated from one spraying to the next the target pest is very less likely to adapt

Resistance management cont
Resistance Management (Cont.)

  • Or, if chemicals with different MOAs are mixed in a single spraying the target pest is unable to adapt

  • The Insecticide Resistance Action Committee (IRAC – in its latest publication identifies 28 insecticide MOAs

  • The Fungicide Resistance Action Committee (FRAC – has identified over 40 fungicide MOAs

  • Dr. Ray Cloyd and I decided that the large number of MOAs should and could be consolidated to be of more use to rosarians – we came up with 6 insecticide MOAs and 6 fungicide MOAs

Resistance management cont1
Resistance Management (Cont.)

  • Your handout contains the two tables that Dr. Cloyd and I derived from the IRAC and FRAC publications

  • MOA 6 in both tables is what Dr. Cloyd calls the “napalm” MOA – the chemicals in this group kill on contact and leave little or no room for adaptation

  • I’ve found two useful insecticide partnerings to be Merit and Tempo and Avid and TetraSan

  • An effective fungicide partnering is Banner Maxx (alternated with Cleary’s 3336F) and Compass

Perspective setting
Perspective Setting

  • Pesticide producers view rose growers as a tiny market

  • Insecticides are primarily marketed to farmers and maintainers of large public areas

  • Fungicides target turf grass markets like golf courses

  • We’re just lucky that these pesticides work to eliminate rose garden pests

Specific chemicals for specific pests
Specific Chemicals for Specific Pests

  • Insecticides

    • Orthene – MOA 1 – a translaminar chemical – spray for the control of aphids, Japanese Beetles, and thrips

    • Sevin – MOA 1 – a contact spray – very effective against Japanese Beetles – has resistance management problems with thrips if used alone – combine with Tempo, Talstar or Conserve

    • Talstar – MOA 2 – a contact spray – also registered as a miticide – good control of aphids and Japanese Beetles – look also for Bifen I/T – exactly the same as Talstar but less expensive ($59.90 vs $99.99 per quart)

More pest killers
More Pest-Killers

  • Insecticides (Cont.)

    • Tempo – MOA 2 - a highly-effective contact spray – kills just about any insect

    • Avid – MOA 3 – a translaminar spray – kills adult spider mites

    • Floramite – MOA 3 – a contact spray – kills all spider mite life stages

    • Akari 5SC – MOA 3 – a contact spray – kills all spider mite life stages – 60% the cost of Floramite

    • Merit - MOA 4 – a very effective systemic chemical – kills any insects that are eating the foliage – use as a drench or spray

And more
…And More

  • Insecticides (Cont.)

    • Conserve – MOA 4 – a translaminar spray – probably the most effective attack on thrips

    • Hexygon – MOA 5 – a contact spray for the control of spider mite larva and eggs – combine with Avid

    • TetraSan – MOA 5 – a translaminar spray for the control of spider mite larva and eggs – combine with Avid for a translaminar spray addressing all mite life stages

    • Forbid 4F – MOA 6 – a translaminar spray for the control of all spider mite life stages – minimum resistance management problems – very expensive

Now disease fungus control
Now Disease (Fungus) Control

  • Fungicides

    • Banner Maxx – MOA 1 – a systemic chemical that attacks blackspot, powdery mildew and rust

    • Eagle 20 EW – MOA 1 – very similar to Banner Maxx but less toxic (CAUTION instead of WARNING) – same active ingredient as Systhane

    • Decree 50 WDG – MOA 1 – specifically registered as a botryticide

    • Cleary’s 3336F – MOA 2 – a systemic chemical that can be alternated with Banner Maxx

    • Chipco 26019 Flo – MOA 3 – specifically registered to control botrytis blight – alternate with Decree

More disease control
More Disease Control

  • Fungicides (Cont.)

    • Subdue Maxx – MOA 4 – targets root and stem rot – primarily used as a drench in greenhouses

    • Compass – MOA 5 – a translaminar chemical that controls just about every rose disease, including botrytis, downy mildew, and powdery mildew

    • Alliette – MOA 6 – an aluminum-based contact chemical that specifically targets downy mildew

    • Manzate – MOA 6 – a zinc- and manganese-based contact spray for the very effective eradication of blackspot – now sold as Pentathlon

    • Zyban – MOAs 2 and 6 – a combination of the active ingredients in Cleary’s 3336F and Manzate – comes as a fine powder

Rtu and otc products
RTU and OTC Products

  • Bayer Advanced Garden Products


    • Rose & Flower Insect Killer

      • A combination of Merit and Tempo

      • Available in spray bottle, hose-end sprayer and concentrate

    • 2 in 1 Systemic Rose & Flower Care

      • Granules sprinkled around bush and watered-in

      • 12-18-6 fertilizer

      • Orthene-like systemic insecticide - disulfoton

Rtu and otc products cont
RTU and OTC Products (Cont.)

  • More Bayer Advanced Garden Products

    • All-in-One Rose & Flower Care

      • Merit insecticide plus Banner Maxx fungicide

      • 9-14-9 fertilizer

      • Mixed 4 tbsp/quart and used as a drench

    • Bayer Advanced Disease Control

      • Concentrate diluted 1.5 tbsp/gallon to spray

      • Active ingredient same as Banner Maxx

Some other rtu otc products
Some Other RTU/OTC Products

  • Safer Brand 3 in 1 Garden Spray – uses fatty acids, sulfur and neem oil (MOA 6) to create an environmentally safe insecticide, fungicide and miticide

  • Green Light Bioganic Organic Rose & Flower Ready-to-Use – uses plant oils (MOA 6) to create an environmentally safe insecticide, fungicide and miticide

  • Ortho Orthenex Insect & Disease Control – active ingredients are acephate (Orthene) and triforine (same chemical group as Banner Maxx)

  • GardenTech Sevin – OTC version of this very effective insecticide (MOA 1)

And finally adjuvants
And, Finally…Adjuvants

  • Adjuvant – serving to help or assist – something to make a spray more effective

  • Stirrup M – a pheromone (sexual attractant) that draws spider mites to any spray in which it’s mixed

  • Indicate 5 – adjusts pH of spray water and serves as a spreader-sticker – most sprays more effective in a slightly acidic liquid

  • Hi-Yield Spreader-Sticker (or any other OTC brand) – makes spray adhere to foliage instead of dribbling off