![]() Their effects may be direct, for example, during application or when consumed in suicide bids. Pesticides in general are toxic chemicals which adversely affect human health when mishandled. A review of some “safe” insecticides used in Africa is presented. ![]() ![]() Release of chemicals into the environment can have global impacts and there is therefore need to use safer analogues designed with safety in mind. However insecticides/pesticides of chemical origin can affect human health directly or indirectly by disrupting ecological systems that exist in rivers, lakes, oceans, streams, wetlands, forests and fields. In most situations insecticides are applied by spraying or dusting onto plants and other surfaces traversed or fed upon by insects. Certain insecticides of synthetic, organic or inorganic origin function as insect repellents, causing little or no harm at all to the target insects. Insecticides in wide use are mostly synthesized organic compounds, though there are some organic compounds of plant origin referred to as “botanicals”, in addition to inorganic compounds of natural and synthetic origin. Substances used to kill or control insect pests can also be referred to as pesticides, though the latter word has a wider scope of application, since other non-insect pests also exist. ![]() It is documented that the use of insecticides by man dates as far back as 1000 B.C, or earlier when burning of stone containing sulfur (brimstone) was used as a fumigant. Insects pests affect humans directly by transmitting diseases or indirectly by attacking cultivated plants in farms or in storage, thus affecting food security. Insecticides are toxic substances that are used to kill or control insects.
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