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The OPALS allergy scale was first published in Allergy-Free Gardening, by Thomas Leo Ogren, in 2000. [1] It covers over 3,000 common trees, shrubs, flowers, and grasses. [3] The allergy scale was updated and extended in 2015 in The Allergy-Fighting Garden. [4] [5] [6]
Tree pollen is most prevalent in the spring, coming from species like ash, cedar, maple and walnut. Grass pollen takes over in the summer, with plants like rye, Kentucky blue grass and orchard ...
Olive pollen is most predominant in Mediterranean regions. Hay fever in Japan is caused primarily by sugi (Cryptomeria japonica) and hinoki (Chamaecyparis obtusa) tree pollen. "Allergy friendly" trees include: female ash, red maple, yellow poplar, dogwood, magnolia, double-flowered cherry, fir, spruce, and flowering plum. [26]
Ashe juniper pollen, along with that of the related Juniperus virginiana, can cause a severe allergic reaction. Consequently, what begins as a winter allergy may extend into spring, as the pollination of J. virginiana follows that of J. ashei. Colloquially, many Texans refer to the allergy as cedar fever.
Urban planners and tree experts have tried for decades to keep streets and sidewalks clear of maple spinners, seed pods and fallen fruit, but these efforts may be leading to an increase in allergies.
Tree pollen is expected to be the worst in the Pacific Northwest this year. For allergy sufferers living in this region, limiting the amount of time spent outside this spring may be a good idea ...
The cypress pollen allergy brings a cross reactivity between diverse species like olive, privet, ash and Russian olive tree pollen allergens. In some rural areas, there is another form of seasonal grass allergy, combining airborne particles of pollen mixed with mold. [ 16 ]
Allergies are hypersensitivity reactions of the immune system to specific substances called allergens (such as pollen, stings, drugs, or food) that, in most people, result in no symptoms. Trees within the order Fagales possess particularly potent allergens, e.g. the prototypical Bet v 1, the major white birch ( Betula verrucosa - now called B ...
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