Liquid fertilizers, pesticides, fungicides, and herbicides should, in general, have the OMRI label if they are to be used on a CNG farm. Confusion is common with these products because labeling language can be misleading. A few pest control products like 100% neem oil may contain just one approved substance, but most are formulations with an active ingredient and additional inactive ingredients. Usually only the active ingredient is listed on the label and companies are reticent to provide full ingredient lists.

Many garden product companies, like Bonide and Fox Farm, make products that have the same active ingredient as OMRI-listed products, but are listed for organic gardening and do not go through the OMRI verification process.

Sometimes the rest of the ingredients in these products are fine, but other times they contain petroleum products or other synthetic materials. To confuse matters further, some of these companies sell both organic and conventional products, with very similar product design and marketing language. Be sure you look for an OMRI label or obtain a full list of ingredients from the manufacturer before using a pest or disease control product.