Thiodicarb showed LD50 and LD90 values of 0.753 and 1.754 mg/larva by topical application and 0.682 and 1.552 μg/larva by leaf sandwich method. This insecticide is superior to methomyl, etofenprox, profenofos, cartap hydrochloride and diafenthiuron and the four conventional insecticides tested. Thiodicarb was not synergised by PBO even at higher synergist ratio of 1:10 in both topical and leaf sandwich methods of application of the mixtures, as the synergistic ratios varied between 1.0 and 1.38. The resistant population of
