I have always had worms in ears in corn when I picked them. The later in the season, the worse they got. Last year I read in a gardening book about adding 3 or 4 drops of mineral oil when the silk first emerged. works great! Is this an acceptable practice for organic gardening? If not, what and how.

I think there is a better way, but I can not tell you what it is. Mineral oil is a petroleum product. Try posting the question in the Vegetables, Fruits and Herbs forum.