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:
“When superstition is allowed to perform the task of old age in dulling the human temperament, we can say goodbye to all excellence in poetry, in painting, and in music.”
—Denis Diderot (1713–1784)
“As in political revolutions, so in paradigm choice—there is no standard higher than the assent of the relevant community. To discover how scientific revolutions are effected, we shall therefore have to examine not only the impact of nature and of logic, but also the techniques of persuasive argumentation effective within the quite special groups that constitute the community of scientists.”
—Thomas S. Kuhn (b. 1922)