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©2013 UpToDate ® Print Email Major causes of allergic rhinitis according to timing of symptoms Season Antigens Examples Early spring Tree pollens Oaks, maples, elms, birches, etc (trees without showy flowers) Spring/Summer Grass pollens Ryegrass, bluegrass, Bermuda grass Late summer Weed pollens Ragweed Throughout the growing season Fungi Throughout the year Household allergens House dust mites, cockroaches, animal dander, molds Occupational Seed dusts, woods, furs, latex, flour, psyllium, and many others Adapted from Naclerio, R, Solomon, W, JAMA 1997; 278:1842.