The Three Lakes Council (Lakes Waccabuc, Rippowam, Oscaleta) has a great website with lots of information that is also relevant to Truesdale Lake.  Their website is http://www.threelakescouncil.org.  One great article is about Yard Care for Lake Stewardship with information about minimizing your property’s impact on the watershed.  Here’s a quote about fertilizer:

Don’t fertilize. The best way to reduce phosphorous is to eliminate fertilizers, which are generally rich in phosphate. To give you an idea of the magnitude of the impact, if all other nutrients are present, as they are in our lakes:

a pound of phosphorous can generate 500 -1100 pounds of algae or lake weeds.

Test soil. If your heart is set on fertilizing, have your soil tested to determine if it is really necessary, and if it is, how much to apply. The Cornell Cooperative Extension will test your soil. Just send a note requesting a soil analysis kit along with a check for $15.60 to:

CCE – Westchester

26 Legion Drive

Valhalla, NY 10595

You will receive a kit and a bag in which to mail your soil sample for a full analysis. (Call 914-285-4640 for more information).

There is a lot more good, sensible information that will save you money — and keep the lake clear and natural!