【目的】 明确不同龄期草地贪夜蛾Spodoptera frugiperda取食海南鲜食玉米对植物补偿生长的影响，为制定周年繁殖区草地贪夜蛾防控指标提供依据。【方法】 采用田间笼罩接虫方式，测定草地贪夜蛾幼虫5个龄期及5种密度下对甜玉米补偿性生长的影响。【结果】 草地贪夜蛾幼虫为害玉米后，随着虫口密度和龄期的不断增加，玉米受害程度呈现增加的趋势；笼罩内密度≤4头/10株时，2-3龄幼虫对鲜食玉米造成的受害程度均不超过10%；玉米苗期（4-6叶期）和小喇叭口期（7-9叶期），草地贪夜蛾2-3龄幼虫密度为4头/10株时，取食玉米对产量没有影响，产量损失率分别为-3.32%和-4.00%；大喇叭口期（10-12叶期）和抽雄期（13-15叶期），密度为6头/10株时4-6龄幼虫为害后产量损失率显著高于2-3龄幼虫的（P<0.05）。【结论】 玉米在一定的受害程度下存在补偿生长，草地贪夜蛾低龄期低密度取食为害下鲜食玉米具有很强的耐受能力，对产量具有补偿效果。

[Objectives]  To determine the compensatory growth of corn at different growth stages induced by the feeding of the fall armyworm (Spodoptera frugiperda). [Method] The effects of feeding by 5 different larval instars at 5 different densities on the compensatory growth of corn were determined in enclosures in corn fields. [Result]  Plant damage generally increased with larval density and instar. At a larval density ≤ 4 larvae per 10 stems, 2nd-3rd instar larvae did not do more than 10% damage. The same larval density and instars had no effect on the yield of corn plants at the seedling (V4-V6) and small bell stages (V7-V9), the effect on yield being 3.32% and 4.00%, respectively. However, a density of 4^th to 6^th instar larvae of 6 larvae per 10 stems, significantly affected yield during the large bell (V10-V12) and the tasseling stages (V13-V15) (P<0.05). [Conclusion]  Corn can compensate for damage by S. frugiperda larvae to a certain degree by compensatory growth and can consequently withstand attack by low densities of younger larval instars of this pest.