No Waste Left Behind: Insect Frass Can Improve Soil Fertility

No Waste Left Behind: Insect Frass Can Improve Soil Fertility Contact: Jessica Ryan Email: Jessica.Ryan@usda.gov Insect droppings, commonly known as insect frass, may seem useless and downright disgusting, but scientists found that this waste can improve soil health when added as a fertilizer in farming. Insect frass is a mixture of excreta, feed, and molted skins. These droppings are a by-product of farming insects like yellow mealworms, banded crickets, and black soldier flies.