Feeding behaviour was an important element in insects which involves the detection, the initiation of ingestion, and the consumption of food. Malachite green was an environmentally persistent and acutely toxic to a wide range of aquatic and terrestrial animals. It causes serious public health hazards and also possess potential environmental problem. Malachite green was highly cytotoxic to mammalian cells and carcinogenic to liver, thyroid and other organs of experimental animals. Incidences of tumors in lungs, breast and ovary and also been reported from rats exposed to malachite green . The larval and adult stages of Drosophila nasuta albomicans were fed in different concentrations of Malachite green. These dietary induced Malachite green showed greater influence on the fecundity of flies, and subsequently it was showed decreased fecundity and lifespan when compared to control.