Abstract: Based on the sequence of its growth and development, the population of citrus leafminer (Phyllocnistis citrella) was divided into such stages as eggs, 1st instar larvae, 2nd instar larvae, 3rd instar larvae, 4th instar larvae, pupae and adults. The affecting factors of each stage were divided into relatively independent status. Based on field investigation and indoor experimental observation, the survivals of each stage were recorded, and their affecting factors were estimated by synthesizing Berryman and Gongxia methods, which would reduce the errors of the natural population lifetable due to generation overlapping. The lifetable of the 9th generation of the population was constructed, and the index of population tendency was 1.32. The analysis of important factors shows that the parasite enemies were the important factor affecting the natural population of citrus leafminer.

Key words: Population lifetable, Important factor analyse, Phyllocnistis citrella, temperature, CO₂, diurnal variation of photosynthesis, photosynthetic pigment, rice