Even light doses of glyphosate can cause disease in organs later on, says a biologist opposed to spraying the herbicide to kill weeds and young hardwoods in New Brunswick and elsewhere. “Glyphosate accumulates in all our organs,” said Thierry Vrain, a soil biologist and former president of the International Federation of Nematology Societies. The New Brunswick forest industry uses glyphosate to kill maple, oak and other hardwood growth, and by NB Power uses it to kill hardwood growth near transmission lines.  The main ingredient Roundup, glyphosate is also sprayed on farmland around the world, despite a finding by the cancer and water branch of the World Health Organization that it is “probably carcinogenic to humans.”