EARTHTEC QZ AND POTASH TREATMENTS CHRISTMAS LAKE, MINNESOTA

Transcription

1 EARTHTEC QZ AND POTASH TREATMENTS CHRISTMAS LAKE, MINNESOTA Keegan Lund Kylie Cattoor- Minnesota Department of Natural Resources Invasive Species Program Great Lakes Commission Invasive Mussel Collaborative Webinar January 11 th, 2016

2 OUTLINE CHRISTMAS LAKE INFESTATION & RESPONSE EFFORTS EARTHTEC QZ TREATMENT Background information Treatment methods & cost Pre and post-treatment monitoring Treatment results POTASH TREATMENT Background information Treatment methods & cost Pre and post-treatment monitoring Treatment results POST-TREATMENT MONITORING TAKEAWAY & LESSONS LEARNED

3 Christmas Lake Hennepin County

4 INITIAL INFESTATION AND RESPONSE EFFORTS MCWD AIS early detection monitoring program in place since 2010 Discovery: August 2014 Zebra mussels found on settlement plate (Aug 16) DNR confirmation + lakewide surveys (Aug 18) Initial Response: Stakeholder meeting (Aug 20) Containment barrier installed (Aug 21) Zebra mussel population assessment (Aug 26 - Sept 5) First control effort (Sept 8) Photos by MNDNR & MCWD

5 PROJECT COORDINATION Minnehaha Creek Watershed District University of Minnesota, MAISRC Blue Water Science Professional Lake & Land Management Christmas Lake Association City of Shorewood

6 ZEBRA MUSSEL POPULATION ASSESSMENT Is the population lake wide? Is the population reproducing? Initial survey efforts = hours Photos by MNDNR & MAISRC

7 PRE AND POST TREATMENT MONITORING Protocol developed by University of Minnesota Pesticide product efficacy testing Concentration/residual monitoring Zebra mussel mortality Photos by MCWD

8 CHRISTMAS LAKE TREATMENT EFFORTS Objective: zebra mussel eradication Control methods - pesticides proposed Zequanox EarthTec QZ Muriate of Potash Pre and post treatment monitoring protocols developed Enclosed treatment area using a curtain barrier

9 TOTAL TREATMENTS ON CHRISTMAS LAKE

10 About the product: Marrone Bio Innovations Molluscicide (bio pesticide, reduced risk EPA registration) Active ingredient: Pseudomonas fluorescens strain CL 145 A cells Highly selective towards zebra and quagga mussels Destroys digestive system when ingested

11 About the product: Produced by Earth Science Laboratories (algaecide/bactericide) Water treatment plants, lakes, irrigation lines, etc. Copper sulfate pentahydrate Cupric ion form (environmentally safe) Somewhat selective molluscicide depending on concentrations Non-target effects (invertebrates and fish) EPA approved in May 2014 (24 states)

12 EARTHTEC QZ TREATMENT Previous label restriction on application frequency Special Local Needs required to maintain lethal concentration over time Treated October-November 2014 Area treated: 32,000 feet 2 (0.75 acres) 3 treatment events (additional bump treatments) Product cost and labor: $1,500 Barrier cost: $2,700

13 24C SPECIAL LOCAL NEED (SLN) REGISTRATION EarthTec QZ submitted request to Minnesota Department of Agriculture (MDA) Previous label restrictions: apply no more than every 14 days SLN Request: need greater treatment frequency than 14 days to maintain adequate copper levels over time 5 week process (from application preparation to approval) MDA issued SLN registration and approved new product label **Federal label change approved, July 2015

14 EARTHTEC QZ EFFICACY TESTING Lake application: every hours to maintain lethal concentrations In-lake Cu+ monitoring essential Product efficacy: 100% mortality achieved by Day 7 (tank trials only) Efficacy of EarthTec QZ for Zebra Mussel Control 100 Mean Mortality Rate (%) Tank Trials Days Post-Treatment

15 MURIATE OF POTASH (POTASH) About the product: Potassium chloride K+ (lethal) interferes with gill respiration Highly selective (zebra and quagga) compared to other molluscicides (Waller et al. 1993) Non-target effects (native mussels) Not registered for use Previously used in Virginia, Texas, and Manitoba, Canada

16 QUARANTINE 18C EMERGENCY EXEMPTION MDA submitted Emergency Exemption to EPA 9 week process (from preparation to approval) Issued for 3 years for 2 lakes in MN 3 treatment events December 2014, June 2015, June/July 2015

17 POTASH EFFICACY TESTING Lake application: Poor mixing at temperatures <40 F (December 2014) Bump treatments every 3-5 days Product efficacy: 100% mortality achieved by Day 9

18 SPRING 2015 ZM MONITORING & RESPONSE TREATMENTS April scuba divers surveyed inside the treatment area and 50 feet outside treatment area No mussels found May two days of whole lake surveys via wading, snorkel and SCUBA 10 mussels found attached to native mussels In sandy substrate ft. outside initial treatment area June Enclosed new zm location and treat with KCl July Treatment area expansion (10 acres) and KCl application

19 MAY 2015 ZM DISCOVERY

20 TOTAL TREATMENTS ON CHRISTMAS LAKE

21 SUMMER/FALL 2015 MONITORING AND ADDITIONAL ZM DISCOVERY Extensive post-treatment monitoring through summer and fall No zebra mussels found in these monitoring efforts October 19, Lake Service Provider found a zebra mussel attached to a boat lift on the south side of lake Final 2015 (October 21, 2015) survey resulted in the discovery of 10 zebra mussels scattered throughout the lake suggesting successful reproduction and settlement

22 OCTOBER 2015 ZM DISCOVERY

23 TAKEAWAYS & LESSONS LEARNED Early detection monitoring Extensive early population assessment snorkel, dive, and then do it again Treatment area size How large to do you treat? Lake testing: more difficult to monitor Field measuring equipment Curtain barrier Cage trials Photo by: MCWD Pre and post-treatment monitoring Partnerships and good communications

24 QUESTIONS