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Insert new title slide. Clearcast ® herbicide, a new product from BASF Professional Vegetation Management (ProVM), provides aquatic and terrestrial weed control with minimal irrigation restrictions. Clearcast is highly selective – controlling target weeds, leaving

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Presentation Transcript
slide2
Clearcast®herbicide, a new product from BASF Professional

Vegetation Management (ProVM), provides aquatic and terrestrial

weed control with minimal irrigation restrictions.

Clearcast is highly selective – controlling target weeds, leaving

desirables unaffected, making it ideal for aquatic areas used for fishing

and other recreation activities.

slide3

History and Development

  • Clearcast is part of the imidazolinone family of chemistry; discovered in 1969.
  • Imazamox, the active ingredient in Clearcast, was first approved for use in 1997 on soybeans and is currently used on 15 different crops on a global basis.
  • In 2003 imazamox received an exemption from tolerance designation from the US EPA, resulting in the waiving of food residue tolerance requirements for all potential food or feed uses of imazamox. It is the only organic herbicide that is exempt from all tolerances.
  • BASF has conducted its aquatic research in conjunction with University Cooperators, US Army Corp of Engineers and consultants.
  • Excellent results have been achieved with foliar treatments on floating and emergent species.
clearcast herbicide formulation

Clearcast Herbicide Formulation

  • Clearcast is a liquid (water based) formulation containing 1.0 pound of active ingredient per gallon of product
  • Clearcast does not contain a surfactant
    • Foliar applications require the addition of an appropriate adjuvant for aquatic sites
  • Clearcast is non-volatile and does not contain any petroleum solvents
slide5

Clearcast Application Flexibility

  • No restrictions on fishing, swimming, drinking, and no live stock watering restriction
  • No irrigation restrictions when residues fall below 50 ppb
  • Labeled for use on golf course irrigation ponds*
  • See label for specific irrigation restrictions
slide6

Irrigation Restrictions

• Still and quiescent waters with an average depth of four (4) or more feet receiving a foliar application of Clearcast (≤ 2 quarts per acre) to emergent/floating vegetation may be used for irrigation on allowable sites 24 hours after application is completed.

• There are no irrigation restrictions on allowable sites for the use of treated water from flowing waters, such as irrigation canals with an average depth of four (4) or more feet, receiving a foliar application of Clearcast (≤ 2 quarts per acre) to emergent/floating vegetation.

• DO NOT use any Clearcast-treated waters from still or quiescent sources for irrigation purposes less than 24 hours after Clearcast application is completed.

• Waters receiving Clearcast either as a water treatment or as a foliar treatment on emergent/floating plants may be used for irrigation as long as concentrations are ≤ 50 ppb.

slide7

Clearcast Application Tips

  • Good coverage is important for optimal control
  • Surfactant is always required for emergent and floating species
  • For best results, use a MSO or MSO/silicone blend
  • Applications can be made around desirable hardwood vegetation
spray adjuvants

Spray Adjuvants

  • The following types of spray adjuvants are recommended for use with Clearcast for emergent treatments:
    • Non-ionic
    • Modified seed oil
    • Vegetable oil concentrates
    • Silicone based surfactants
    • Invert emulsions
  • Always use an adjuvant that is appropriate for aquatic use
mode of action

Clearcast inhibits a plant specific enzyme (AHAS) that is essential to the production of three amino acids.

  • Sensitive plants stop growing within 24 hours after treatment and then slowly senesce as food and energy reserves are exhausted. Speed of senescence will vary with plant size and growth habit.
  • Clearcast is quickly absorbed by plant foliage and translocated throughout the plant where it concentrates in the actively growing portions of roots and shoots. This characteristic enhances the long term control of many perennial plant species.
  • For foliar applications Clearcast is rainfast within one hour.
  • Clearcast is taken up by plant roots in terrestrial settings. Root uptake in aquatic settings is likely to be less significant because of the significant water solubility.

Mode of Action

mammalian toxicology

Mammalian Toxicology

  • Clearcast herbicide has a very favorable toxicological profile and product labeling carries a CAUTION signal word
  • Acute mammalian (human) toxicity via oral, dermal, eye and inhalation routes of entry are all EPA category III-IV, the lowest level of concern
  • Based on the results of EPA required testing, Clearcast is not expected to cause any adverse chronic affects in mammals
  • Clearcast is not a carcinogen, terratogen, mutagen nor is it an endocrine disruptor
ecotoxicology

Ecotoxicology

  • Clearcast has a very favorable ecotoxicology profile
  • Based on the battery of studies performed to achieve EPA registration, Clearcast is not expected to have an adverse acute or chronic effect on birds, fish, mammals, insects, mollusks or crustaceans
slide12

Species/Test

LC50/LD50

NOEC/NOEL

Mallard duck

8-day dietary

>5572 ppm

5572 ppm

14-day dietary

>1950 mg/kg

1950 mg/kg

Bobwhite quail

8-day dietary

>5572 ppm

5572 ppm

14-day dietary

>1846 mg/kg

1846 mg/kg

Honey bee contact

>25 mg/bee

25 mg/bee

Ecotoxicology

slide13

Species/Test

LC50

NOEC

Bluegill sunfish

96h flow-through

>119 ppm

119 ppm

Rainbow trout

96h flow-through

>122 ppm

122 ppm

Daphnia

96h flow-through

122 ppm

>122 ppm

environmental fate water and sediment soil

Water:

  • The primary means of dissipation in water is via dilution and photolytic breakdown
  • Photolytic breakdown in water results in a 10 to 14 day half life
  • Photolytic half life will vary based on water clarity, depth, vegetative cover and light intensity
  • Clearcast herbicide does not bioaccumulate in aquatic organisms

Environmental Fate- Water and Sediment/Soil

  • Sediment/Soil:
  • Clearcast herbicide does not partition into or accumulate in the hydrosoil/sediment
  • Under aerobic soil conditions (terrestrial), Clearcast is degraded by soil microorganisms
  • The half life of Clearcast in soil is approximately 12-days, depending on environmental and soil conditions
slide15

Floating, emergent, and shoreline weeds and brush

  • Water hyacinth
  • Frogbit
  • Water shield
  • Water lily
  • Alligator weed
  • Primrose
  • Common salvinia
  • Lotus
  • Parrotfeather
  • Water four leaf clover
  • Pennywort
  • Pickerelweed
  • Smartweed
  • Spatterdock
  • Sagittaria
  • Cattail
  • Phragmites
  • Giant reed- arundo
  • Chinese tallowtree
  • Brazilian pepper tree
control
Control

Purple Loosestrife

9 months after treatment – 32 oz/A

slide22

Arundo 0.5% + 1% MSO

9 months after treatment

slide23

Selective Chinese Tallowtree

and Phragmites Control

Aerial application of Clearcast applied over the top of desirable hardwoods.

slide25
Red Mulberry - Morusrubra

Salt bush, Groundsel-tree – Baccharis halimifolia

Wax Myrtle – Myrica cerifera

Loblolly Pine - Pinus taeda

Southern Red Cedar - Juniperussilicicola

Sugarberry - Celtislaevigata

Bald Cypress - Taxodiumdistichum

Elm Species – Ulmus spp.

Chinaberry tree - Meliaazedarach

Black Willow - Salixnigra

Live Oak - Quercusvirginiana

Trees shown to be tolerant to Clearcast

Species listed are results from research conducted by Jack Whetstone, Clemson University

slide26

Cypress Screening (LSU Sanders)

Study conducted by Dr. Dearl Sanders at Louisiana State University shows the tolerance of foliar applied Clearcast to cypress seedlings from rates ranging from 64oz/A to 4oz/A.

0

8

4

16

24

32

64

slide28

Water Hyacinth

6 weeks after treatment

Untreated

Clearcast 16oz/A

slide29

Water Hyacinth

4 weeks after treatment

slide30

Cattail, Sedge and Alligatorweed

25 days after treatment - 0.5% v/v

Red maple tolerance at 64oz/A

slide31

Cattail, Sedge and Alligatorweed

63 days after treatment - 0.5% v/v

slide33

Watershield

6 weeks after treatment - 64oz/A

slide37

Common Salvinia in Louisiana

64 oz/A + MSO/silicone blend 1% v/v

slide39

Common Salvinia in Louisiana

6 month after treatment

slide41

Frogbit, Cattail and Pickerelweed Control

2 months after treatment - 32oz/A

slide42

American Pondweed

25 days after treatment

slide43

Summary

  • Slow acting so no dissolved oxygen concerns
  • Only EPA tolerance exempt herbicide
  • Labeled for golf course waters
  • More consistent control compared to glyphosate alone
  • Great tank mix partner with glyphosate
  • Good coverage is important for optimal control
  • Surfactant is always required for emergent and floating species
  • For best results, use a MSO or MSO/silicone blend
  • Applications can be made around desirable hardwood vegetation
  • Non volatile
slide44

What is the difference between Clearcast

and Habitat® herbicide?

  • Clearcast is approved for both submerged and foliar applications.
  • Clearcast is more selective.
  • Clearcast has minimal effect on brush.
  • Clearcast can be used in irrigation water with minimal irrigation limitations.
  • Clearcast has a short soil residual.