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施用昆虫病原线虫对荔枝园中龟背天牛幼虫的空间分布型的影响不明显。该虫的空间分布仍符合负二项分布，同时也符合核心分布和复合波松分布；空间图式是聚集型。天牛幼虫于试验果园中的分布也与果园的方位有关。利用调查数据，组建荔枝龟背天牛幼虫的经济阈值。1995年的天牛幼虫经济阈值为每株虫口0.07头，即百株虫口达7头时需要利用线虫进行防治。根据经济阈值组建的序贯抽样表可在节省抽样工作量的基础上，确定荔枝园荔枝龟背天牛幼虫是否需要防治。
The effect of applying the entomopathogenic nematode on the spatial distribution of larvae in the litchi garden was not obvious. The spatial distribution of the insects still meets the negative binomial distribution and coincides with the core distribution and the complex wave distribution. The spatial schema is aggregated. The distribution of Celastrus larvae in the test orchard is also related to the orientation of the orchard. Using the survey data, the economic threshold of larvae of Litchi chinensis was established. In 1995, the economic threshold of larvae per hectare was 0.07 per insect population, which means that nematodes should be used for prevention and control when the number of insect population reached seven. The sequential sampling table constructed according to the economic threshold can determine whether the larvae of Litchi Chingii need to control the larvae on the basis of saving the sampling workload.