fall armyworm pests damage the ear corn on field

agribusiness agriculture brazil cereal corn macro rural agricultural agronomy bollworm bordered caterpillar cob crawls crop cultivation depth destroys ear earworm eats environment farm farming feeds forage fruit grain growing helicoverpa insect larvae leaf maize maizeear mature oilseed outdoor pest plant plantation ripe scarce seeds selective shallow stalks straw vegetables worm fall armyworm pests damage field brazilian