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
Famous quotes containing the words human and/or impact:
“Every daring attempt to make a great change in existing conditions, every lofty vision of new possibilities for the human race, has been labeled Utopian.”
—Emma Goldman (1869–1940)
“Too many existing classrooms for young children have this overriding goal: To get the children ready for first grade. This goal is unworthy. It is hurtful. This goal has had the most distorting impact on five-year-olds. It causes kindergartens to be merely the handmaidens of first grade.... Kindergarten teachers cannot look at their own children and plan for their present needs as five-year-olds.”
—James L. Hymes, Jr. (20th century)