[Coleus]

i think some rabbis go over and above the Torah. If i’m not mistaken, if the naked eye can’t see it then it’s ok to consume. I remember a few yrs. ago some NYC rabbis didn’t want their flock to drink the tap water because a microscopic crustacean was found. Believe it or not the water for NYC is ranked the most pure for large cities which is pumped in from reservoirs from upstate.

http://query.nytimes.com/gst/fullpage.html?res=9C04E5D71631F932A35755C0A9629C8B63

[Tax-chick]

The pesky little insects are hard to spot because in colder environments, like a refrigerator, they burrow inside berries to keep warm, kosher supervisors say. The size of a small freckle, these pests are often hard to spot. Jewish dietary laws, based on Leviticus, ban consumption of live insects the naked eye can see.

I can see aphids and thrips on my rose bushes, but I can see the problem with their burrowing in the fruit. (So wash the fruit good before you put it in the fridge!)

However, if the people choose to follow the directives of their rabbis, whether we or anybody think it makes sense or not, it's still the free market.