Pilchuck Pollinator

Does Roundup live up to the claims?

It depends on who is making what claims.  To some people it is the Devil incarnate.  But let us look at the claims.  First, is it non-toxic?  Yes, glyphosate is completely inactive in animals.  As is claimed, it is less toxic than common salt which some people think of as the staff of life, but you eat a kilo of salt and you are a goner  (of course you have to keep it down).  So would I drink a cupful of roundup?  Certainly not!  Roundup is a formulation that in addition to glyphosate contains a detergent.  The detergent lowers the surface tension and helps to get the glyphosate into the plant.  So drinking a cup of Roundup would be the equivalent of drinking a cup of liquid Tide – not fatal but not nice.  Word of advice:  when diluting Roundup add water to the container first – that way you avoid foam.

Second, does Roundup persist in the environment?  No, it really does decompose in a few days to carbon dioxide, water and a trace of nitrate.  In this respect it is diametrically the opposite of the early chlorinated pesticides which persist for years, evaporate into the atmosphere and eventually condense at the poles. This is the model of the Earth as a giant still.  So seals in the arctic can get their pesticide burden from pesticide spraying in the tropics.  (Incidentally there is a developing worry about another class of compounds:  brominated ethers, which are used to make fabrics and plastics non-flammable.  These are parallel to the chlorinated compounds but contain bromine, the next heavier halogen).

Problems Using RoundUp?

I grow  peonies and have very carefully sprayed the grass around them in spring avoiding the young shoots.  One can be very specific in what one sprays.  Several plants have developed distorted shoots with streaks lacking chlorophyll.  This can mimic natural variegation.  I think this must be a case of transmission through the soil.  In other words, although Roundup does decompose in the soil, for some plants that are really sensitive it can be absorbed by surface roots in the few days it takes to decompose.  There is also a hint that Rhododendrons can be damaged (not killed) because they have surface roots and careless overuse around them may result in absorption.  Roundup damage is basically chloroplast damage and evidences itself in pale areas or streaks on leaves.

So although Roundup is one of the most benign chemicals yet to come on the market, it is highly potent and overenthusiastic use by yourself or hired help can result in disaster.  This is the fault of the operator not the chemical.  It is particularly important to not use too fine a mist when spraying to avoid drift on to desired plants, and to avoid spraying in a wind.