DDT Uses: What It Was Used For and Why It Was Banned

DDT was the first modern synthetic insecticide, and it was used on cotton and other crops, on livestock, in forests, in homes and gardens, and against malaria and typhus. The US Environmental Protection Agency (EPA) cancelled it in 1972 because of harm to wildlife and possible risks to people. Today the Stockholm Convention bans all uses of DDT except a limited acceptable purpose, disease vector control against malaria. This page lists what DDT was used for, shows the numbers behind its rise and fall, and gives a residue calculator for how long it lingers in soil.

DDT stands for dichlorodiphenyltrichloroethane. Nothing here is a how-to: DDT is banned for farm use in the United States and in the countries that are parties to the Stockholm Convention, and this is a history and health guide only. Always follow the product label and your local pesticide rules for any chemical you use today.

The seven main uses of DDT

EPA describes DDT as the first of the modern synthetic insecticides, developed in the 1940s. It was used first against malaria, typhus and other insect-borne diseases among soldiers and civilians. It also worked well on insects in crop and livestock production, in institutions, homes and gardens, according to EPA’s short history of DDT. EPA’s own regulatory survey lists the uses that were cancelled one by one, and they give a good picture of where it was sprayed:

1. Cotton. Cotton took most of the DDT used in the US late in its life. Of the amount applied in 1970-72, over 80 percent went on cotton (EPA, 1975 survey).
2. Other food crops. The rest went mainly on peanuts and soybeans, and EPA’s 1971 notices also covered citrus and certain vegetables. In August 1970 the US Department of Agriculture (USDA) cancelled DDT registrations for 50 food crops.
3. Livestock. The same 1970 USDA action covered beef cattle, goats, sheep and swine.
4. Forests. The US Forest Service used DDT mainly against the gypsy moth and the spruce budworm. It cut spraying from 4.9 million acres in 1957 to just over 100,000 acres in 1967.
5. Homes, gardens and amenity plants. USDA moved in November 1969 to cancel uses on shade trees, aquatic areas, the house and garden, and tobacco. In 1970 flowers and ornamental turf followed.
6. Buildings, wood and commercial premises. The August 1970 cancellation included seasoned lumber, finished wood products, buildings, and areas in and around food plants and restaurants.
7. Disease control. During and after World War II the US produced large amounts of DDT for control of typhus and malaria abroad. Exports rose from 12 percent of production in 1950 to 67 percent in 1969, with large purchases made for malaria control (EPA, DDT regulatory history, 1975).

Why was it popular? The same EPA survey names its reasonable cost, effectiveness, persistence and versatility. Persistence is also the trait that later caused the trouble.

How much DDT did the US use?

EPA’s 1975 survey says about 1.35 billion pounds of DDT were used in the United States in the 30 years before cancellation. Use peaked at about 80 million pounds in 1959 and fell to just under 12 million pounds in the early 1970s. EPA gives four reasons for the fall: growing insect resistance, more effective alternatives, public concern about side effects, and tighter government limits. The chart shows the drop in use and in exports.

Chart

US DDT use and exports fell sharply

Million pounds. Use: 1959 vs just under 12 in 1970-72 (plotted as 12). Exports: 1970 vs 1972

The fall started well before the 1972 ban. Insects had already become resistant in many places, and EPA notes that DDT’s quick success and broad use led many pest species to develop resistance. A product that stops working loses its buyers even without a law.

Why DDT was banned for farm use

Scientists raised warnings in the mid-1940s, but public alarm grew after Rachel Carson published Silent Spring in 1962, according to EPA. Four government committees reported between 1963 and 1969, and all four recommended phasing the pesticide out over a limited period. Environmental groups took cases to court from 1967. The table sets out the main steps.

Several US states acted before the federal government. EPA’s survey says DDT was outlawed except in emergencies in eight states, including Iowa, New York and Wisconsin, and eighteen more put some limit on it. For a farmer today the practical point is simple: EPA cancelled the registrations, so any old stock is waste. Contact your state pesticide regulator or hazardous-waste program about disposal.

What DDT does in the environment and the body

EPA says DDT is very persistent in the environment, builds up in fatty tissue and can travel long distances in the upper atmosphere. After US use stopped, levels in the environment and in animals fell, but residues from past use remain. The US Fish and Wildlife Service explains the best-known effect: DDT interfered with the ability of birds to make strong eggshells, so eggs broke or failed to hatch. When only 417 bald eagle nesting pairs were known in 1963, the species was in danger of extinction (US Fish and Wildlife Service). The Service estimated at least 9,789 nesting pairs in the lower 48 states in 2007, and 71,467 breeding pairs from data for 2018 to 2019.

Chart

Bald eagle nesting pairs in the lower 48 states

Pairs known or estimated; survey methods differ by year

The counts come from different survey methods, so read the chart as a recovery trend, not an exact ratio. The Service ties the eagle’s near-extinction to DDT, and the later rise followed the end of its use.

For people, the main route of exposure today is food. The federal toxicology guide from the Agency for Toxic Substances and Disease Registry (ATSDR) says most people are unlikely to be exposed, and that the most common route is eating contaminated meat, fish, poultry and dairy products. It adds that the US Department of Health and Human Services says DDT may reasonably be anticipated to be a human carcinogen, that EPA classes it as a probable human carcinogen, and that the International Agency for Research on Cancer (IARC) once found it may possibly cause cancer in humans. IARC has since classed DDT as probably carcinogenic to humans (Group 2A, 2015) (ATSDR ToxFAQs for DDT). In animal studies, effects were seen on the nervous system, liver and reproductive system.

How long does DDT residue last in soil?

ATSDR states that microorganisms in soil break DDT down slowly, and that it can take 2 to 15 years to break down half of it. That range is wide because soil type and climate matter. The chart applies simple halving to both ends of the range. Real soils do not always follow a smooth curve, so treat it as an illustration, not a forecast for any field.

Chart

Share of DDT left in soil at the two ends of the half-life range

Percent of starting amount, simple halving; illustration, not measured data

Use the calculator to see how long a residue might take to fall to a given share. Enter your own half-life; the default is an example, not a measured value for any site. If you farm land with a known past spray history, ask your state agriculture department or an accredited lab about soil testing.

Try the numbers for your own farm below.

Is DDT still used anywhere?

Yes, but not on farms. The Stockholm Convention on Persistent Organic Pollutants was adopted in Stockholm on 22 May 2001 and entered into force on 17 May 2004, and it lists DDT among the pesticide POPs (Stockholm Convention overview). EPA summarises the treaty this way: it bans all uses of DDT except a limited acceptable purpose, controlling the mosquitoes that carry malaria. EPA adds that the World Health Organization recommends DDT as one of 12 insecticides for indoor residual spraying, that each country decides whether to use it, and that the aim is to keep it within integrated vector management and out of agriculture.

The Convention’s website also lists a DDT expert group that keeps this acceptable purpose under review. The World Health Organization (WHO) says the two core malaria vector control tools are insecticide-treated nets and indoor residual spraying, and that insecticide resistance in Anopheles mosquitoes threatens progress (WHO malaria fact sheet). WHO’s guidance on indoor residual spraying lists DDT only as an option of last resort, to be used in full compliance with the Stockholm Convention, and says no manufacturer has applied for WHO prequalification of a DDT spray product (WHO, indoor residual spraying products, 2021). That is why the debate over DDT has moved from farms to public health. Rules differ by country, so check your own national pesticide authority.

What farmers use instead of DDT

The main replacement is not one product but a method. The UN Food and Agriculture Organization (FAO) says integrated pest management (IPM) was developed in response to rising pesticide use that led to pest outbreaks, resistance and growing evidence of harm to human health and the environment. It combines biological, chemical, physical and cultural practices to grow healthy crops while using fewer pesticides (FAO on IPM). EPA describes the order of steps: monitor and identify pests, set action thresholds, use preventive methods, then choose the effective, less risky controls first. It calls broadcast spraying of non-specific pesticides a last resort (EPA on IPM).

EPA defines biopesticides as pesticides derived from natural materials such as animals, plants, bacteria and certain minerals, and counted 390 registered biopesticide active ingredients on 31 August 2020 (EPA, What are biopesticides). Other modern chemicals are regulated product by product. No chemical is risk free, so read the label for each one, and ask a certified crop adviser or your extension service which option fits your crop and pest.

Scouting is one place where technology can help. Satellite vegetation maps, such as those in the Farmonaut Satellite + AI Farm Monitoring System, show where crop health is dropping so you can walk to those spots first. They show a change in plant cover, not the pest or its cause, so a field visit still decides the action.

▶ From chemical-heavy pest control to integrated pest management, with GIS and remote sensing. · 14:45

Why DDT stopped working

A pesticide can fail before any law stops it. EPA notes that DDT’s quick success and broad use led many insect pest species to develop resistance, and its 1975 survey lists increased resistance first among the reasons use fell after 1959. FAO describes the same pattern as the reason IPM was created: heavy pesticide use led to pest control crises, such as outbreaks of secondary pests and the return of pests after resistance developed. The lesson is practical. If one product is used on every acre every season, the pests that survive pass on their survival traits, and the product loses value.

WHO reports the same problem in malaria control today, where resistance to insecticides among Anopheles mosquitoes threatens progress. That is one reason public health programs value having more than one tool, and why farm advisers ask growers to rotate products with different modes of action where the label allows.

What this means if you farm old cotton or orchard land

Most readers will never handle DDT. A few farm land that was once sprayed, such as old cotton, peanut, citrus or vegetable ground in the US. EPA says residues of concern from past use still remain in places, because the chemical is so persistent. That does not mean every field is a problem. Soil half-lives vary from 2 to 15 years in the ATSDR figure, and levels depend on how much was applied and the soil type.

If you are buying or leasing such land, three steps are sensible. Ask the seller about past use and any soil tests. Ask your state agriculture department or extension office which accredited labs test for organochlorine residues and what limits apply to food crops. Then plan crops and sampling with a certified adviser. These are questions to ask, not a substitute for the rules in your state or province.

How we checked the numbers

All dates and quantities on this page come from the agency pages linked in the text, which we opened in October 2026. US use figures are from EPA’s 1975 regulatory survey, so they cover the United States only and are in pounds of product as reported there. Eagle counts are from the US Fish and Wildlife Service and use different survey methods in different years. The half-life range is ATSDR’s general range for DDT in soil. The decay lines on the chart are our own arithmetic from that range, not measured data.

Lessons for pest management today

DDT shows what happens when one chemical does most of the work. Resistance builds, wildlife pays a cost, and residues outlast the product. Three practical lessons follow. First, scout before you spray, because the EPA steps put monitoring first. Second, rotate and mix methods so no single control carries the load. Third, keep records of what was applied and where, which also helps when buyers or regulators ask.

The same thinking applies to farm records and supply chains. Related pages on our site: product traceability, farm carbon footprint tracking, farm fleet management, large-farm management app, satellite and weather API documentation and API access.

▶ Sustainable pest control strategies for aphids, from high-tech tools to traditional methods. · 12:44

FAQ

What was DDT used for?

It was used against disease-carrying insects such as mosquitoes, on crops (mostly cotton in the US by the early 1970s), on livestock, in forests, and in homes, gardens and buildings, according to EPA.

Is DDT legal for farm use?

Not in the US, where EPA cancelled it in 1972, and not in countries bound by the Stockholm Convention, which bans all uses except the acceptable purpose of disease vector control. Check your own national rules.

Why was DDT banned?

EPA cited harm to wildlife and potential human health risks. DDT persists in the environment, builds up in fatty tissue and thinned the eggshells of birds such as the bald eagle.

Does DDT cause cancer?

US and international authorities have classed it as a probable or possible human carcinogen. HHS says it may reasonably be anticipated to be one, EPA says probable, and IARC classed it in 2015 as probably carcinogenic to humans (Group 2A).

How long does DDT stay in soil?

ATSDR says it can take 2 to 15 years to break down half of it, depending on soil. Use the calculator above to see how long a given share takes at a half-life you choose.

What replaced DDT in agriculture?

Integrated pest management: scouting, thresholds, prevention and targeted controls, with broad spraying as a last resort (EPA, FAO). Follow the label and local rules for any product.

Sources used on this page

This page was checked in October 2026 against EPA, the US Fish and Wildlife Service, ATSDR, WHO, FAO and the Stockholm Convention, listed in the sources section. It is general information and not legal, medical or professional advice; ask your regulator or a certified adviser about your own situation.