Chasing Monoecious Hydrilla from the. Cayuga Inlet, Ithaca, NY

Transcription

1 Chasing Monoecious Hydrilla from the Adirondack Region Hydrilla Workgroup Cayuga Inlet, Ithaca, NY Bob Johnson April 11, 214

2 To Finding Hydrilla in Fall Creek

3 213 Cayuga Inlet Treatment Use of two herbicides (July 1, 213) June 2, Aquathol K (endothall) (August 14 October 15, 213) July 12 October 31, 212 Sonar Genesis (fluridone - liquid) Sonar One (fluridone - pellet)

4 July 1, 213 Endothall Allowed hydrilla to emerge and elongate to ~ inches before the application, granting any late tuber germination. Within 3 days most plants died and turned into mush. No regrowth found.

5 213 Fluridone Sonar Genesis applied via boat and automatic injection units. Pellets applied in areas with low flow. Treatment started on August 14, 213 and continued through October 15, 213 No growth observed in the Cayuga Inlet following the July 13, 213 Endothall application through October 28, 213

6 Tubers / 173 cm2 Tubers / 173 cm2 First! The Positive Findings in the Cayuga Inlet Results of Hydrilla Tuber Density Measurements /31 Sprouted + Unsprouted Tubers at Cayuga Inlet S of Rt 79 Bridge / /14 3/ /1 /19 7/ % Bonferroni CI for the Mean 1 cores sampled per date through 11/12/ cores sampled 12/4/12 to 1/28/13 (Numbers above the mean bars and zeros on x axis are tubers/m scaled-up from sampled area means) 8/ / 9/27 1/ / /4 5/7 5/ /1 7/3 8/5 Unsprouted Tubers at Cayuga Inlet South of Rt 79 Bridge 3/14 3/15 /1 /19 7/13 8/ 3 9/12 9/3 1/28 95% Bonferroni CI for the Mean 1 cores sampled per date through 11/12/ cores sampled 12/4/12 to 1/28/13 (Numbers above the mean bars and zeros on x axis are tubers/m scaled-up from sampled area means) 9/ 9/27 1/22 12/4 4/4 5/7 5/22 /1 7/3 8/5 9/12 9/3 1/28 3/19/14 3/19/14

7 Tubers / 173 cm2 Tubers / 173 cm2 Declining Tuber Densities Continued in 213 Finding fewer unsprouted tubers that would germinate in the future /22 3/14 3/ /22 3/14 3/15 Sprouted + Unsprouted Tubers at CU Boathouse Bay Unsprouted Tubers at CU Boathouse Bay / /1 /19 7/1 17 8/ /19 7/ / / 9/27 1/22 11/2 12/4 9/ 9/ /22 11/2 95% Bonferroni CI for the Mean 1 cores sampled per date through 11/12/ cores sampled 12/4/12 to 1/28/13 (Numbers above the mean bars and zeros on x axis are tubers/m scaled-up from sampled area means) 95% Bonferroni CI for the Mean 1 cores sampled per date through 11/12/ cores sampled 12/4/12 to 1/28/13 (Numbers above the mean bars and zeros on x axis are tubers/m scaled-up from sampled area means) 12/ /4 4/4 1 5/ / /7 5/ /1 7/ /5 3 /1 7/3 8/5 8 9/12 9/3 1/28 3 9/12 9/3 1/28 4/2/14 4/2/14

8 Tubers / 173 cm2 Tubers / 173 cm Sprouted + Unsprouted Tubers in Cayuga Inlet at Linderman % Bonferroni CI for the Mean 1 cores sampled per date through 11/12/ cores sampled 12/4/12 to 1/28/13 (Numbers above the mean bars and zeros on x axis are tubers/m scaled-up from sampled area means) /2 3/2 4/12 /1 / /13 8/ 9/ 9/27 1/22 11/12 12/4 4/ 5/7 5/22 /1 7/3 8/5 213 Unsprouted Tubers in Cayuga Inlet at Linderman 9/12 9/3 1/28 In the Cayuga Inlet at Linderman Creek we have not recovered any un-sprouted tubers since Dec 212 4/3/ % Bonferroni CI for the Mean cores sampled per date through 11/12/ cores sampled 12/4/12 to 1/28/13 8 (Numbers above the mean bars and zeros on x axis are tubers/m scaled-up from sampled area means) /2 3/2 4/12 /1 /19 7/13 8/ 9/ 9/27 1/22 11/12 12/ / 5/7 5/22 /1 7/3 8/5 9/12 9/3 1/28 4/3/14

9 At Farmer s Market / Cascadilla Creek we have not recovered any unsprouted tubers since April, 213 Tubers / 173 cm2 Tubers / 173 cm2 Sprouted + Unsprouted Tubers at Farmer's Market/Cascadilla Creek / /8 3/ / /1 /19 7/13 8/ 9/ 95% Bonferroni CI for the Mean 1 cores sampled per date through 11/12/ cores sampled 12/4/12 to 1/28/13 (Numbers above the mean bars and zeros on x axis are tubers/m scaled-up from sampled area means) / /4 4/ /7 5/22 /5 7/ /12 9/3 1/28.45 tubers / 273 cm2 or 1. tubers / m2 4/2/ Unsprouted Tubers at Farmer's Market/Cascadilla Ck 95% Bonferroni CI for the Mean 1 cores sampled per date through 11/12/ cores sampled 12/4/12 to 1/28/ (Numbers above the mean bars and zeros on x axis are tubers/m scaled-up from sampled area means) /18 3/8 3/22 4/ /1 / / / 9/ 9 1/22 12/4 8 4/ 5/7 5/22 /5 7/3 9/12 9/3 1/28 4/2/14

10 Sprouted at Farmer s Market but not frozen in winter Frozen in winter ~ 3months Frozen in winter ~ 3 months

11 12+ months (~375 days) since planting tubers and ~ 11 months since germination and sprout formation, however no emergence Depth planted ~ 7 in Elongated sprouts for 1 months Sprouts 3 to 4 inches in length 1 % grow when placed in light

12 Tuber Sampling from Inlet

13 Start of Lake s Rake Toss Plant Survey finds Hydrilla in Fall Creek August 8, 213

14 Overnight of August 8 and into the 9 th Large Storm Occurs

15 August 1 th water receding at Fall Creek

16 Lots of Hydrilla swept into the lake Sediment Plume extends >1 mile north

17 213 Rake-toss plant survey of 1535 locations or 37 rake tosses in Cayuga Inlet and Southern Cayuga Lake

18 Evaluation of Plant Species Diversity and Abundance in southern Cayuga Lake while Searching for Hydrilla using 2 Rake-tosses on a 5X5m UTM Grid

19 During the Lake Raketoss Survey found Hydrilla August 21, 213

20 Three patches found in Southeast corner in ~ 4 inches of water depth Hand removal first, then benthic barrier placed on bottom over removal area

21 Attempted to remove all plant material with this large bed likely producing the smaller bed next to it by a stem runner

22 Smaller patch north of other two hydrilla beds No Tubers found in this smaller bed

23 Plants removed by hand on Aug. 28, 213 were beginning to initiate rhizomes that would produce overwintering tubers late Summer and Fall 213 in Cayuga Lake

24 On Aug. 28, 213 New overwintering tubers had already began forming with our finding of fully formed and large tubers on the Mother Plant of the larger bed.

25 Sampling the Fall Creek Hydrilla just before Sept. 2th Endothall application

26 213 hydrilla finds in Fall Creek before Endothall Treatment on September 2 th Lake areas were not treated with herbicide

27 Lush Hydrilla Growing in November 213 along Fall Creek after Endothall Treatment on September 2 th

28 Difficult herbicide application areas Thanks to the NYS and Local Ithaca Hydrilla Task Forces Questions???