Tenant is Anti-Glyphosate (Round Up) - Realistic Request?

[Alexandra Hughes Pailet]

I recently contracted a landscaping company to do a complete overhaul at my rental. Today, the tenant contacts me unhappy that they were using Round-Up as it contains glyphosate. Trying to reassure her, I sent her links to the EPA site (https://www.epa.gov/ingredients-used-pesticide-products/glyphosate) which states that it isn't harmful when used correctly. She does not believe it and is adamant that they stop and switch to a more natural solution.  

Has anyone else had this come up with tenants?