Any poisonous material used to kill insects is an insecticide. These compounds are mostly employed to get rid of disease-carrying insects in certain places or to control pests that attack farmed plants. Insecticides can be divided into different categories based on their chemical composition, toxicological effects, or modes of penetration. According to the latter classification system, they are divided into those that operate via eating (stomach poisons), inhalation (fumigants), or penetration of the body covering (contact poisons). However, the majority of synthetic insecticides permeate across all three of these channels, making their fundamental chemistry a better approach to distinguish them from one another. In addition to synthetic insecticides, some naturally occurring chemical and inorganic substances found under plants can also be effective insecticides; some of these are even allowed in organic farming practices. The majority of pesticides are sprayed or sprinkled onto plants and other surfaces that insects travel across or feed on.
Modes Of Penetration:
Stomach poisons are mainly effective against insects with biting or chewing mouthparts, such as caterpillars, beetles, and grasshoppers. Stomach poisons are harmful only if consumed through the mouth. Arsenicals, such as Paris green (copper acetoarsenite), lead arsenate, and calcium arsenate, as well as fluorine compounds, including sodium fluoride and cryolite, are the main stomach irritants. On the leaves and stems of plants consumed by the target insects, they are sprayed or dusted. Synthetic pesticides have gradually taken the role of stomach poisons since they pose less of a threat to people and other mammals.
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