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7. Air Pollution
Chemical discharges into the atmosphere have increased dramatically
during this century, but the total effect on plants is virtually unknown.
It has been demonstrated that air pollutants can cause mortality and
losses in growth of plants.
8. Herbicide use
Herbicides should be handled very carefully; misapplication of
herbicides can often damage non-target plants. Symptoms of herbicide
injury are variable due to chemical mode of action, dosage, duration
of exposure, plant species, and environmental conditions. Some
herbicides cause growth abnormalities while others cause foliage
yellowing or browning, defoliation, or death.
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