Human Impact
The corn earworm is considered to be a major agricultural pest, with a large host range encompassing not only corn, but also numerous other crop plants. Pesticides are one method by which corn earworm populations are controlled; however, since they have been widely used, the insects are resistant to many pesticides. The use of biological controls, such as the bacterium Bacillus thuringiensis and various forms of nematodes, is also common, although not without its own problems. Corn earworms are only variably vulnerable to the bacterium, and nematodes are only effective once the larvae have pupated and dropped to the ground.
Read more about this topic: Helicoverpa Zea
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