But when the immigration ratio is above the threshold , it will slow down or stop the resistance evolution of the pest population.

在阈值以上时，可延缓或完全阻止害虫种群的抗性演化。

The simulated results indicate that there is a threshold of migration ratio in the migration of different genotypes influencing the resistance evolution of pest population.

模拟结果表明，迁入比例对害虫种群抗性演化的影响存在一定的阈值。

If the genotypes of immigration individuals are all resistant (R gene), and the immigration ratio is below the threshold, then it will accelerate the resistance evolution of pest population.

若迁入个体携有R基因，则迁入比例在阈值以下时，会促进迁入区害虫种群的抗性演化；

It suggested that this system could be used to predict the resistance development and evaluate the resistance management strategies of pest population.

据此，作者认为抗性模型可用于预测害虫抗性演化和评价抗性治理策略。