Uzarou's Deadly Parasites

You target an organic organism you can see, (Such as a piece of meat, plants, water, a creature) Every living organism within 150 foot sphere centered on the object becomes infected with deadly parasites. Nothing is visibly different about these things, but they will have deadly side effects if consumed. If a creature consumes a piece of infected water or food, it takes must succeed a DC 18 constitution saving throw or 3d10+5 necrotic damage (half as much damage on a successful save) and is poisoned for 24 hours. Any plants within the radius die within 24 hours if the spell is not dispelled. A creature that starts it's turn in the radius must succeed on a DC 16 constitution saving throw or be infected as well. A creature that is infected becomes poisoned and takes 1d10+5 Necrotic damage on each of it's turns until the the spell ends or until the parasites are removed by  magic, (they can be removed by any spell or magic item that cures disease).