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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