show Abstracthide AbstractAdults of two MED populations, PyriR, which is susceptible to the insecticide Mospilan (acetamiprid), and 9-2103, which is resistant, were fed on cotton seedlings (Gossypium hirsutum L. cv. Acala) treated with the insecticide Mospilan at an LC30 dose (lethal concentration required to kill 30% of the population; 2 ppm for PyriR and 100 ppm for 9-2013) with the dipping method. Whiteflies fed on untreated cotton seedlings were used as controls