Major Pesticide Groups:
An astounding number of pesticides are used in modern agricultural operations. These pesticides range from fungicides (which kill fungi) to herbicides (which kill weeds) to insecticides (which kill insects that feed upon crop plants). Many of these chemicals are either toxic or carcinogenic to humans at very low concentrations. In addition, some of them are teratogenic (meaning that they can cause birth defects) as well. Because of this, we at Eastern Oregon Analytical reccommend that growers avoid the use of these chemicals by employing organic husbandry practices.
Oregon law currently specifies testing for four clases of pesticide - Organophosphates, Pyrethroids, Chlorinated Hydrocarbons, and Carbamates. These are all insecticides, and as such have the greatest potential for human toxicity. Oregon law does not yet require testing for any of the herbicides, fungicides, or vermicides (vermicides are chemicals used to treat parasitic worms in domestic animals- these residues can appear in crop plants when manure is used as fertilizer). However, tolerances for these other types of pesticide are expected in the future. Current law states that "A sample of usable marijuana shall be deemed to test positive for pesticides with a detection of more than 0.1 parts per million of any pesticide." Oregon law also currently requires that pesticide testing be conducted in an IOS certified laboratory.