Scientific name: Helicoverpa zea.
This moth species belongs to the family of Noctuidae. The larvae of Helicoverpa zea, corn earworm, is a major agricultural pest. The moth measures 3.2 to 4.5cm in wingspan. The corn earworm moth has different common names like cotton bollworm and tomato fruitworm.

This moth is particularly destructive as it targets the most important parts of a plant for food. As insignificant as it might seem, the economic costs of this moth type are over $250 million per year in the United States.

Scientific name: Sitotroga cerealella.
Angoumois grain moths attack several grains. This moth species is mainly associated with ear corn, and it's rare in shelled corn. 

This insect is a primarily stored grain pest because its caterpillar stages develop entirely within a grain kernel. The infested grain, therefore, loses its economic worth. In addition to this, it causes an unpleasant smell, so animals may refuse to eat it and reduce its consumption.

Scientific name: Ephestia kuehniella.
This moth species belongs to the family Pyralidae. As its name suggests, this moth species is a common pest of flour. Although it explicitly infests flour, people also know it as a prevalent pest that targets cereal grains. 

You’ll find these insects in various parts of the world. The adult variants have a wingspan of about 2 to 2.5cm and a length of around 0.9 to 1.2cm. The forewings have a uniform grey color with some dark brown and white marks.