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应用定点观察和跟踪调查的方法，研究了湿地松粉蚧林间种群数量消长规律。结果显示，湿地松粉蚧种群在疫区边缘存在８～１０ｋｍ宽的高密度区，虫口密度达６０～７０头／松梢；粉蚧侵入的季节不同，种群密度高峰出现时间也不同，一般粉蚧侵入半年后种群密度达到最大，之后锐减；林间种群数量消长主要受湿地松新梢的影响，现有天敌无法有效控制种群数量的增长。
Using fixed-point observation and follow-up survey methods, the Pinus elliottii Forest population dynamics decline. The results showed that the population density of mealybugs tended to be 8 ~ 10km wide at the edge of the epidemic area, and the population density of pest population was 60-70 per pine shoots. The population of mealybugs invaded in different seasons and the population density peak appeared at different times. After six months, population density reached the maximum and then dropped sharply. The decline of forest population was mainly affected by the new shoots of P. sibirica. The existing natural enemies could not effectively control the population growth.