Adverse Consequence of Pesticides like DDT
Most pesticides tend to accentuate the problems of both production and pollution instead of containing them. The consequence of pesticides is almost invariably adverse and harmful.
In the Ninteenth century, the ladybird beetle was brought from Australia to California to control a scale insect pest of oranges. It is reported that the beetle successfully kept the pest under check for more than five decades until about 1946 when DDT began to be used in the citrus orchards. The beetle was susceptible to DDT and hence its population declined.
However, a subsequent withdrawal of DDT again restored the natural balance of biological control within a few years.
In fact, DDT is one of the most effective pesticides known. This is the reason why it was banned in the USA in 1972. its remarked insecticidal properties were first discovered in 1939. it became a ubiquitous contaminant of fish, penguins, birds and human being. Hence a popular public movement started in the USA that asked the Government to protect the public from the general toxification of the environment by DDT and persistent poisons.