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Spring Member Meeting THURSDAY + dues payments

posted Mar 2, 2020, 5:20 PM by Keith Gilbert
Lake Johanna homeowners: Two very important items you need to be aware of.

1. Our annual meeting is this Thursday evening, March 5, at 7:00pm in the Fellowship Room at Johanna Shores Presbyterian Homes, 3220 Lake Johanna Blvd (use the north Care Center entrance between the old and new buildings).

Please join us at this important meeting to find out what's new on Lake Johanna. The featured speaker will be Raymond M Newman, from the University of MN. He will be speaking on "Management of water quality and invasive plants to promote native plant communities". See the abstract of his talk below.*

2. Your payment for 2020 Lake Johanna Aquatic Plant Treatment is due now!

To make your payment, visit and follow the simple instructions. 

You can either bring your check and signature form to the Spring Member Meeting on March 5, or mail your check and signature form to the address provided in the instructions. Your prompt payment reduces the amount of work our volunteer board members must do each spring chasing down payments.

Thank you!
The LJIS Board

Management of water quality and invasive plants to promote native plant communities
Lake managers take a variety of approaches to improve water quality and reduce impairment from excess nutrients, algae and poor water clarity. Reducing external loading is often followed by approaches to reduce internal loading. Removal of invasive common carp (Cyprinus carpio), which disrupt bottom sediments, release nutrients, and reduce macrophytes and water clarity can be an important first step. Reductions in carp are expected to improve water clarity and the expansion of aquatic macrophytes. Further reductions in internal loading via alum treatment will also improve water clarity.  However, in both instances invasive macrophytes such as curlyleaf pondweed and Eurasian watermilfoil may respond better than native macrophytes and plans to deal with invasive macrophytes are need. I’ll review case studies on lakes in Riley Purgatory Bluff Creek Watershed District and the subsequent response of native macrophytes to invasive macrophyte expansion and control. Herbicidal control of curlyleaf pondweed with early season endothall treatments is effective but often requires treatment each spring. A variety of approaches to control Eurasian watermilfoil can be effective but invasive control alone may not restore native plants. Maintaining good summer long clarity appears important to native plant expansion.  A recent concern is for hybrid watermilfoil, a cross between the native northern watermilfoil and introduced Eurasian watermilfoil. Some strains of hybrid are resistant to herbicides and need careful management.