fall armyworm pests damage the ear corn on field

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