Lannate methomyl insecticide, introduced in 1968, has been one of DuPont's most successful crop protection products. DuPont researchers nearly overlooked the insecticide potential of Lannate in the early 1960s because the substance failed to impress them in routine laboratory testing.
However, when it was tried on boll weevils, cotton pests not ordinarily used in laboratory screening because of their difficult upkeep, it proved highly effective. Subsequent trials showed similarly positive results with a variety of chewing insects.
Lannate is a water-soluble powder packaged in a water-soluble bag that can be added to a water container and mixed with no direct human contact. It is then sprayed onto cotton, fruit and vegetable crops. Lannate operates both on contact and as a specific stomach poison for the egg, larval and adult forms of several varieties of insects like armyworms, cutworms, leafhoppers, thrips and the European corn borer. Its "low residual," or quick breakdown time after application, and its rain-fastness on leaves once dried increase its safety for mammals and the environment, though its toxicity requires prudent handling and observance of stated safety and use precautions.