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人工接种试验结果表明，D.tritici-repentis侵染小麦幼苗使胚根变褐、缢缩、腐烂，芽鞘出现褐色条斑，甚至死亡。侵染幼苗叶片出现梭形或椭圆形病斑，边缘有较明显的黄色晕圈。侵染成株期叶片形成较大病斑。侵染穗部使领壳变褐或小穗死亡，籽粒胚部变黑。D.tritici-repentis对小麦各生育期的致病力较D.sorokiniana弱。
The artificial inoculation test results showed that D.tritici-repentis inoculated wheat seedling browning, shrinking, decaying radicle, Brown streaks appeared in the bud sheath, and even died. Infected seedling leaves appear fusiform or oval lesions, the edge of the more obvious yellow halo. Invaded adult leaves form a larger lesion. Invade the panicle so that the shell is brown or spikelet death, grain embryo darkens. D. tritici-repentis has weaker pathogenicity than D. sorokiniana in different growth stages of wheat.