Products That Work, From People Who Care®

New Tradewind™ and Clipper™ Aquatic Herbicides

Jim Petta, Mike Riffle, PhD. and Joe Chamberlin, PhD. May 2012 Aquatic Short Course

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Tradewind Specifications

Active Ingredient: bispyribac-sodium (Tradewind™) Chemical Family: pyrimidinyloxybenzoic acid Mode of Action: acetolactate synthase (ALS) inhibitor

− ALS is a plant specific enzyme − Similar MOA to imazamox, imazapyr, and penoxsulam − But unique family which leads to differential uptake and

selectivity Registered in Spring 2011 Formulation: 8 oz WSP No swimming, drinking, or fishing restrictions Applied to multiple lakes/sites in 2011-12 in Florida with

excellent results (efficacy and selectivity)

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Tradewind Toxicology and E-fate

No drinking, fishing or swimming restrictions Excellent toxicology profile (minimal PPE)

− Not acutely toxic to mammals − Not carcinogenic, teratogenic or mutagenic

Excellent environmental fate profile; 30 day HL

Non-Target Species Toxicity Birds Practically non-toxic

Freshwater Fish Practically non-toxic

Estuarine Fish Practically non-toxic

Freshwater Invertebrate Practically non-toxic

Estuarine Invertebrate Practically non-toxic

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80% SP formulation Unique WSP package

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Thomas Lake

75 acre lake near Lakeland, FL − Nine foot average depth with some deep “holes”

Target species: Hydrilla verticillata

45 ppb Tradewind subsurface July 22, 2011

ACOE evaluated treatment

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Native Species To Conserve

Southern naiad/bushy pondweed (Najas guadalupensis)

American Lotus (Nelumbo lutea)

Bladderwort (Utricularia spp.)*

Coontail(Ceratophyllum demersum)*

* Not observed until post treatment

7 Application Day

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Naiad + Hydrilla (0 DAA)

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July 20, 2011 Pre-treatment Biomass 3 sample sites (3 transect lines) N=9 Hydrilla = 69 + 22 g dry wt. Naiad 18 + 7 g dry wt. Bio-volume = 61%

Dr. Mike Netherland, ACOE

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No “Bumps”

Concentration of bispyribac-sodium in Thomas Lake

0.0

5.0

10.0

15.0

20.0

25.0

30.0

35.0

40.0

45.0

7/22/1

18/5

/11

8/19/1

19/2

/11

9/16/1

1

9/30/1

1

10/14

/11

10/28

/11

11/11

/11

11/25

/11

12/9/

11

12/23

/111/6

/12

1/20/1

22/3

/12

Date

Co

nce

ntr

atio

n (

pp

b)

Application Date: July 22nd, 2011 Dr. Mike Riffle and Walter Albeldano, Valent USA Corp.

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Oct 20, 2011

Post-treatment Biomass 3 sample sites (3 transect lines) N=9

Hydrilla 0.83 + 2.1 g dry wt - 99% biomass reduction

Naiad 13 + 9 g dry wt.

Bio-volume = 9 %

Dr. Mike Netherland, ACOE

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Minimal impact on floating @ emergent plants (October 27: 3 months after application)

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Minimal impact on Southern Naiad (October 27: 3 months after application)

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Conclusions

Tradewind in Thomas Lake − Very effective against Hydrilla at the target dose of

45 ppb

− Minimal impact on natives Southern Naiad, lotus, cattails

− 2-3 month residual in water, no “bumps” needed

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New Clipper Herbicide

New chemistry/MOA in PPO inhibitor

High efficacy against Cabomba, Hydrilla including rHydrilla, Duckweed, watermeal

Short contact time = fast uptake

There and gone within 2-3 days

No drinking, fishing, or swimming restrictions

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Clipper Specifications

Active Ingredient: flumioxazin

Mode of Action: Initiates cell membrane disruption

Low toxicity (minimal PPE)

Good environmental profile

51% WDG (water dispersible granule)

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Algae Control

Algae types include filamentous algae (Pithophora and Cladophora)

200 ppb target rate Some planktonic control observed Coverage Tank mix and rotate

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Non-Target Plant Selectivity

Good selectivity observed in operational applications to Eelgrass, maidencane, chara, pickeralweed

Water lily sensitivity in treatment zone

O 50 100 200 400 800 1600

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Cabomba, pre and 30 DAT at 200 ppb

Lake Josephine, near Sebring, FL 2011

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Target Cabomba and Limnophila

Lake Seminole, GA, FL

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14 DAT at 200 ppb

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Hydrilla Perimeter Treatment

Excellent control at 120 + days Clipper at 200 ppb + Reward at 200 ppb

Butler Chain , 2011

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Clipper

Submersed species (cabomba, Hydrilla, coontail, EWM, CLP, others):

Good to excellent results at 200 ppb (label is 100 to 400 ppb)

Hydrilla 200 ppb + Reward (diquat) at 200 ppb; 200 ppb alone in

low pH and high turbidity

pH plays a role in activity (lower = longer half life)

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Watermeal (Wolffia spp.)

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11 DAT at 200 ppb

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Watermeal and Duckweed 200 ppb at 14 DAT

Target filamentous

St. Petersburg, FL 2011

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Duckweed and Watermeal

Target 200 ppb

Apply subsurface or surface (not foliar per se)

Retreatment depends on budding rate, population, introductions, water fluctuations, etc.

Plan additional treatments under severe conditions

NIS or similar (MSO) Silicone?

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Hygrophila Control at 157-200 ppb

University of Florida, 2011

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Hygrophila

Broward County, 2011

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Hygrophila at 200 ppb 28 DAT

Broward County, 2011

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So What Have we learned?

For submersed plants…. − Apply before emergence/topping out − Target rate is 200 ppb − Second application may be necessary for re-growth if

any − Tank mix diquat for Hydrilla, Hygrophila

For floating plants……

− Apply 200 ppb rate − Surface application/reduced rate for deeper areas − Surfactant? − Duckweed and watermeal may require retreatment of

the area for new growth or introductions

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Questions?