玉米红蜘蛛属蜱螨目、叶螨科。一般干旱年份发生严重,发病后玉米叶片完全变白、干枯,造成籽粒干瘪。 1 发生与为害规律 全年发生10～20代。在我省中北部地区成螨于10月中旬在玉米田边的杂草根际土缝内越冬,来年春暖恢复活动,5、6月份开始点片发生,先为害小麦或杂草,然后转移到玉米幼苗的下部叶片为害,7～8月份是为害盛期。如条件适宜,迅速由点片扩散到全田,旱地玉米发生重,水浇地发生较轻。玉米或杂草上的红蜘蛛均在叶背面活动,卵散产在 Corn spider mites acarina, spider mites Branch. A serious dry year in general, after the onset of corn leaves completely white, dry, resulting in dry kernels. 1 occurs and the law of harm occurs throughout the year 10 to 20 generations. Mites in the central and northern regions of our province in mid-October in the cornfield edge of the rhizosphere of winter weeds in winter, the spring and autumn to resume activities in the spring and May and June began filming, the first damage to wheat or weeds, and then transferred to Lower leaves of corn seedling damage, 7 to August is the damaging period. If the conditions are right, the rapid spread from the spot to the whole field, dry maize heavy occurrence, irrigated less. Red spiders on corn or weeds are active on the back of leaves, with scattered eggs