Humans have struggled against weeds

Humans have struggled against weeds since the beginnings of agriculture. Marring our
gardens is one of the milder ects of weeds - any plants that thrive where they are
unwanted. They clog waterways, destroy wildlife habitats, and impede farming. Their
spread eliminates grazing areas and accounts for one third of crop loss; they compete for
sunlight, nutrients, and water with useful plants.
The global need for weed control has been answered mainly by the chemical industry. Its
herbicides are elective and sometimes necessary, but some pose serious problems, particu-
lardy, if misused. Toxic compounds threaten animal and public health when they accumulate
in food plants, ground water and drinking water. They also harm workers who apply them.
In recent years, the chemical industry has introduced several herbicides that are more
ecologically sound. Yet new chemicals alone cannot solve the world's weed problems. Hence
scientists are exploring the innate weed killing powers of organisms, primarily insects and
microorganisms.
The biological agents now in use are environmentally benign and are harmless to humans.
They can be chosen for their ability to attack selected targets and leave crops and other
plants untouched. In contrast, some of the most effective chemicals kill virtually all the
plants they come in contact with, sparing only those that are naturally resistant or have
been genetically midi-ed for resistance. Furthermore, a number of biological agents can be
administered only once, after which no added applications are needed. Chemicals typically
must be used several times per growing season.

Kết quả (Klingon) 1:

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