Quinalphos solution is primarily used as an agricultural insecticide to control a wide range of pests in crops such as cotton, rice, and vegetables. It effectively targets sucking and chewing insects, including aphids, leafhoppers, and bollworms, by disrupting their nervous system. The solution is applied through foliar spraying or soil treatment, providing protection to crops and improving yield. Additionally, it is sometimes used in pest control for stored grains to prevent infestations. However, its use requires careful handling due to its toxicity to non-target organisms, including humans and beneficial insects like bees. Proper application and adherence to safety guidelines are essential to minimize environmental impact and health risks.