Rotenone

Rotenone is a naturally occurring isoflavonoid compound that functions as a powerful botanical insecticide. It is extracted from the roots of several tropical plant species, primarily those belonging to the genera Derris and Lonchocarpus. Within agricultural practices, it is valued as an effective solution for organic and sustainable farming due to its short residual activity and plant-based origin.

Rotenone is classified as an insecticide with both contact and stomach action. Its primary mode of action involves the inhibition of cellular respiration. Specifically, it disrupts the electron transport chain in the mitochondria of insects, effectively depriving the cells of oxygen. This leads to an immediate cessation of feeding, followed by paralysis and eventual death of the pest.

The substance is widely applied to protect a variety of vegetable, fruit, and ornamental crops. It is particularly effective against the following pests:

• Aphids (various species);
• Spider mites;
• Thrips;
• Leaf-feeding caterpillars;
• Certain beetle larvae.

A crucial aspect of applying rotenone is its susceptibility to sunlight. The compound is highly photolabile, meaning it breaks down rapidly upon exposure to UV light. To ensure maximum efficacy, applications should be conducted during late evening or under overcast conditions. Thorough coverage of the foliage is essential, as the insecticide must come into direct contact with the pests to be effective.

Regarding safety and handling, users must exercise caution due to the substance's extreme toxicity to fish and other aquatic organisms; it must never be applied near water bodies. Rotenone also poses risks to beneficial insects, such as bees, if applied during bloom. Proper personal protective equipment (PPE), including respirators and gloves, should be worn to prevent dermal contact and inhalation during the preparation and spraying process.