Silicon (Si) and Plant growth regulators (PGR’s) are known to induce resistance against various insect pests. A study was conducted to determine the effect of Si and PGR’s on biology and induced resistance in maize against recently invaded fall armyworm (FAW), Spodoptera frugiperda. Different foliar silicic acid (FSA), gibberellic acid (GA₃) and jasmonic acid (JA) at different concentrations and combinations were evaluated. The larvae fed on plants treated with FSA, FSA + GA₃ and jasmonic acid exhibited lower larval, pre-pupal and pupal weight, whereas no effect of gibberellic acid alone on these parameters. Application of FSA at 2 ml L⁻¹and GA₃ 0.5 mg plant⁻¹ significantly decreased the larval weight (18.38 mg at 5th day, 219.35 mg at 10th day), pre-pupal weight (168.64 mg), pupal weight (158.22 mg) and larval survival (70.00%), fecundity (500.20 eggs/female) and fertility (62.68%). Male longevity was decreased by all the treatments except with the application of GA₃ and JA and female longevity was unaffected by JA. The biological parameters of S. frugiperda were negatively correlated with increase in Si, phenols and tannins and potassium concentration in leaves. The study conclusively demonstrated significant negative effect on various biological parameters of FAW when plants were treated with Si and PGR’s.

已知硅（Si）和植物生长调节剂（PGR's）可以诱导抵抗各种害虫。进行了一项研究以确定Si和PGR对玉米的生物学影响以及诱导的玉米抗最近入侵的秋天粘虫（Spodoptera frugiperda）的抗性。评估了不同浓度和组合的不同叶硅酸（FSA），赤霉素（GA ₃）和茉莉酸（JA）。用FSA，FSA + GA ₃和茉莉酸处理的植物喂食的幼虫表现出较低的幼虫，pre前和p重，而单独的赤霉素对这些参数没有影响。在2 ml L ^-1和GA ₃ 0.5 mg植物^-1下施用FSA显着降低了幼虫体重（第5天为18.38 mg，第10天为219.35 mg），pu前体重（168.64 mg），p重（158.22 mg）和幼虫存活率（70.00％），繁殖力（500.20个卵/雌性）和生育率（62.68％）。除GA ₃和JA的应用外，所有处理均降低了男性的寿命，而JA则不影响女性的寿命。弗氏链球菌的生物学参数与叶片中硅，酚和单宁以及钾浓度的增加呈负相关。这项研究最终证明了当用Si和PGR处理植物时，对一汽各种生物学参数产生显着的负面影响。