If you see it being sprayed and are dismayed, here are some great background documents to support your advocacy.
http://www.sustainable.org/governance/policies-ordinances-a-taxes/1744-guidelines-on-sustainable-landscaping-for-federal-agencies
Sustainble land management protocols exist in state parks and preserves, conservation areas, game reserves, and in various places around the world from ranchlands managed for wildflowers, to forests managed for fire control, management regimes define land use patterns and the outcomes on the landscape. This is a key leverage point for conversations about responsible farming within parklands and national parks ( such as in ohio) as well as in city parks where children are playing.
Democracy! Awesome.