He stopped using synthetic insecticides and anhydrous ammonia in 1969, and in 1988 began the transition to certified organic, which was completed in 1996. (rodaleinstitute.org)
Oregano oil is as good as synthetic insecticides at fighting of a common beetle, Rhizopertha dominica, that can ruin stockpiles of cereal. (scientificamerican.com)
However, unlike synthetic insecticides, where the insect merely has to make contact before fizzing away and dying, neem oil must be eaten when on the leaves. (supernaturalacnetreatment.com)