What type of insecticides have been largely replaced by more environmentally friendly alternatives?

Chlorinated hydrocarbons have been largely replaced by more environmentally friendly alternatives due to their persistent nature in the environment and potential harmful effects on both non-target organisms and human health. While these insecticides, such as DDT, were once widely used because of their effectiveness in controlling a variety of pests, their long half-lives result in bioaccumulation and lead to detrimental ecological consequences. The environmental impact, including the disruption of ecosystems and harm to wildlife, has driven the shift towards insecticides that are less harmful and more biodegradable.

In contrast, organophosphates and carbamates, while also facing scrutiny and regulation due to their toxicity, have not been as completely phased out in favor of environmental alternatives as chlorinated hydrocarbons. Botanical insecticides, derived from plants, are gaining popularity but are often still regarded as supplementary options rather than replacements for traditional insecticides.