宁夏引黄灌区为害玉米的叶螨主要为朱砂叶螨Ｔｅｔｒａｎｙｃｈｕｓｃｉｎｎａｂａｒｉｎｕｓ（Ｂｉｏｓｄｕｙａｌ）和二斑叶螨Ｔ．ｕｒｔｉｃａｅＫｏｃｈ。受害玉米叶片干枯，一般提前成熟２０～２５天，千粒重下降３～２０％。年发生１０～１４代，在土隙、杂草根际越冬。农业防治应采用晚秋深耕、灌水，早春消除杂草，水旱轮作，以及尽量避免菜粮混作等。化学防治可采用３０％敌氧３０００倍、８０％敌敌畏十４０％氧化乐果（１：１）２５００倍、２０％高久２５００倍喷雾，防效均在９０％以上。 Tetranychus cinna abarinus (Tetosytraus) and Tetranychus urticae (Tetranychus cinnabarinus) were the main mites infecting maize in Ningxia Yellow River Irrigation Area. urticaeKoch. Damaged corn leaves dry, generally mature 20 to 25 days in advance, 1000-grain weight decreased by 3 to 20%. Occurred in 10 to 14 generations, in the soil gap, weeds overwinter rhizosphere. Agricultural prevention and control should adopt deep plowing in late autumn, irrigation, weeds in early spring, drought and drought rotation, and try to avoid food mixed. Chemical control can use 30% enemy oxygen 3000 times, 80% dichlorvos 40% omethoate (1: 1) 2500 times, 20% long 2500 times spray, control effect is above 90%.