Most weeds are problems to man as well as the methods of controlling them. Some of the effects include:
POLLUTION OF SOIL AND GROUND WATER:
Some chemical used in weed control destroy soil living organisms and other plants in the environment. Some of the chemicals are washed down the rivers and seas as flood during the process of erosion. As the chemicals enter the water bodies they affect the aquatic life of animals and plants in the water. When animals are fed with the water, it becomes toxic to them.
CONTAMINATION OF LIVESTOCK PASTURE:
Some of the chemical used in the weed control can contaminate pastures and fed to the livestock, they become toxic and can cause death of the animals.
CONTAMINATION OF FOOD EATEN BY MAN:
The use of weed control chemical can affect anybody that eats the food and can even lead to instant death of the person. Also, over application of chemicals can cause death of the plant.
DEATH UPON INHALATION:
Administration or spraying of some of the chemicals on a windy day can go kilometers away from where it is sprayed. It can be inhaled by man or animals and can lead to death.