DDT Full Form
Dichlorodiphenyltrichloroethane
What does DDT stand for? A science term, explained.
DDT Full Form in English, letter by letter
DDT is Dichlorodiphenyltrichloroethane, a synthetic insecticide that is now banned for farm use in most countries because it lasts in nature.
DDT Full Form in Indian Languages
Few chemicals have won a Nobel Prize and then been banned worldwide. DDT is short for Dichlorodiphenyltrichloroethane, and this page also lists its name in six Indian languages.
The molecule and how it kills insects
DDT is an organochlorine insecticide: two chlorinated benzene rings joined to a trichloroethane group. It acts on the insect nervous system by keeping sodium channels open, so nerves keep firing until the insect dies. It works on contact, hardly dissolves in water, and stays active on a sprayed wall for months.
The same stability is the problem. DDT and its breakdown product DDE dissolve in fat and break down slowly. They build up in the bodies of animals, grow more concentrated at each step of a food chain, and cling to soil and sediment for years. Traces have been found in animals living far from any spraying.
From a 1874 lab to a 1948 Nobel Prize
The Austrian chemist Othmar Zeidler first made the compound in 1874 and saw no use for it. In 1939 the Swiss chemist Paul Hermann Müller, working at the firm Geigy, discovered that it kills insects. He received the 1948 Nobel Prize in Physiology or Medicine for this.
During the Second World War, troops and civilians were dusted against lice that spread typhus, famously in Naples in 1943 and 1944. After the war, DDT was sprayed indoors to fight malaria in many tropical countries, and it became a cheap farm insecticide used on cotton, rice and many other crops.
Silent Spring, the ban and the Stockholm treaty
In 1962 Rachel Carson's book Silent Spring described how pesticides, DDT among them, were harming birds and other wildlife. Public pressure grew, and the United States banned most uses of DDT in 1972. One clear effect in birds of prey was thin eggshells that cracked in the nest.
The Stockholm Convention on Persistent Organic Pollutants, which came into force in 2004, lists DDT and allows it only for disease-vector control, mainly malaria. The International Agency for Research on Cancer, part of the WHO, classifies DDT as probably carcinogenic to humans.
Why DDT is still used in India
India withdrew DDT from agriculture in 1989 but kept it for public health. Under government orders its public-health use is capped, and Hindustan Insecticides Limited, a public-sector company, is the sole manufacturer. Indoor residual spraying, where the walls of houses are sprayed, is used against malaria and against kala-azar (visceral leishmaniasis) in endemic areas such as parts of Bihar.
Research from Bihar has reported that sandflies in some places have become resistant to DDT, which weakens the spraying programme. Alternatives such as synthetic pyrethroids are in use for malaria control, and India has reported DDT residues in food and human milk samples in some studies.
How DDT appears in exams
Spell it as dichloro-diphenyl-trichloroethane. The facts examiners like are: the discoverer of its insecticidal action (Paul Hermann Müller, Nobel Prize 1948), the book that raised public concern (Silent Spring, 1962), the chemical class (organochlorine) and the concepts it illustrates, bioaccumulation and biomagnification.
UPSC environment papers usually bring DDT in under persistent organic pollutants and the Stockholm Convention rather than as a simple full-form question. SSC and state PSC papers more often ask the full form and the Nobel facts.
DDT, BHC and other pesticides students mix up
DDT is often listed with other organochlorines such as BHC (benzene hexachloride), aldrin and endosulfan. They share the property of persistence, but they are different chemicals with different bans and dates. Endosulfan in particular became a major public-health controversy in Kerala and Karnataka, and India banned it in 2011.
Newer farm insecticides such as organophosphates and pyrethroids break down faster, though some of them carry other risks.
DDT shows that an insecticide can be cheap, effective and damaging to an ecosystem at once. Today its use is limited to disease control, which is also why it keeps appearing in environment questions.
DDT Full Form: Common Questions
What is the full form of DDT?
Dichlorodiphenyltrichloroethane. It is a synthetic organochlorine insecticide, once used widely in farming and malaria control, and now restricted under the Stockholm Convention because it persists in the environment.
Why is DDT banned?
It builds up in fat and food chains, thins the eggshells of some birds, and is classified as probably carcinogenic to humans. Most countries have banned it for agriculture, with a narrow exemption for disease-vector control.
Is DDT still used in India?
Yes, for public health only. Agricultural use was withdrawn in 1989, but indoor residual spraying continues in some malaria and kala-azar areas, with supply from Hindustan Insecticides Limited.
Who discovered DDT's insecticidal action and what did he win?
Paul Hermann Müller, a Swiss chemist at Geigy, discovered it in 1939 and received the 1948 Nobel Prize in Physiology or Medicine. Othmar Zeidler had first made the compound in 1874.
What is biomagnification, and how does DDT show it?
Biomagnification means a substance becomes more concentrated at each step up a food chain. DDT is stored in fat, so fish-eating birds carry far more of it than the small organisms they feed on.
Does DDT appear in Indian competitive exams?
Yes. The full form, the Nobel link, Silent Spring and its place among persistent organic pollutants recur in SSC, UPSC and state-level general-science and environment questions.