But why do seed mixes sometimes become infested with bugs? It’s not necessarily because the seed is unclean or low quality, but instead has to do with the farming and harvesting process. The most likely suspect is the Indian Meal Moth (Plodia Interpunctella). When cereals and grains are grown in the field, the moths lay their eggs on them. When the seeds are harvested from plants, bug eggs and larvae can get caught up in the mix. While the seeds sit in your pantry, these eggs and larvae can develop in the bag into full-grown insects.