This book describes the importance of citrus pests especially emphasizing on citrus leafminer (Phyllocnistis citrella) which is serious threat to citrus nursery in Pakistan. The main objectives of these studies were to determine the frequency of insecticides against citrus leafminer, to find the best insecticide which give maximum protection in the citrus nursery. Ten insecticides viz: emmamectin benzoate 1.9 EC, imidachloprid 20 SL, profenofos 50 EC, lufenuron 50 EC, acetamiprid 20 SP, bifenthrin 10 EC, spinosad 240 SC, cyhalothrin 2.5 EC, flufenoxuron 10 DC and triflumuron 20 EC were used in two different seasons, spring season and monsoon season. spinosad 240 SC showed maximum mortality more than 90% after 96 hours of application with maximum frequency of fourteen days.