With the discovery of pollen allergies, it was recognized that fall symptoms were due to ragweed pollen rather than due to hay exposure. August 15 is endearingly referred to amongst allergists as the start of ragweed season.
Mold spore counts tend to rise dramatically in the fall with falling leaves and dying plants. Molds thrive in the decomposing plant matter and their spores float into the air. Gardening in mulch or dirt, farming or hiking in the woods can also increase exposures to mold spores this time of year.
Mold grows best above freezing temperatures and when it is damp, such as after rainfall. During warm periods of winter, mold spore counts can temporarily spike, which can be confusing for mold allergic patients that may not be expecting an allergy flare during winter months. For seasonal allergy sufferers, it is important to meet with a board-certified allergist to identify which allergens are most bothersome and to allow for more focused attention on avoidance measures and treatment options.
See Full List of Services. Expert Health Articles. Home Expert Health Articles. It is found in woods and hedges as well as by roads and streams. Elm is wind pollinated, usually flowering early in the spring and peak pollination occurs in March. Willows are small 3 to 15m shrubs or trees commonly found in wet environments such as riverbanks and lake shores. They are closely related to aspens, cottonwoods and poplars. They are among the earliest flowering trees in the UK, with peak polination occuring in March.
Poplar is a medium-sized deciduous tree, growing to heights of up to 16 to 27m. It is common in towns and cities where it is often used along boulevards or around squares.
In the UK, poplar flowers in spring, with peak pollen production during March. The common silver birch is a single-stemmed, deciduous tree up to about 25 metres tall, with distinctive silvery bark. Birch pollen is highly allergenic and is a significant cause of asthma and rhinoconjunctivitis. Pollination occurs from spring to early summer, peaking between April and May. The European ash is a broad, deciduous tree, growing up to 35 m in height. Ash trees are wind pollinated, with pollen travelling up to metres from the tree.
They spread large amounts of pollen during the flowering season, which in the UK is from March to May, with the peak occurring in April. The London plane tree is easily identified by its distinctive bark which peels in large flakes. It is commonly found in urban areas of the UK, planted along streets and in squares. Over half of the trees found in central London are of this species.
London plane is wind pollinated and pollination peaks during May. Oaks are large deciduous trees with broadly spreading canopies, found throughout the UK both in rural areas and in urban or suburban parkland.
Flowering generally occurs in spring but may vary based on local temperatures and weather conditions, with pollination peaking around May. Oilseed rape is a common food crop in the UK, grown principally for oil production. Hanna Schantl 5. Ursula Brosch 5. Pramodchandra Harvey 5. Edith Bucher 5. Laurent Marquer 5. Family: Daisy family Asteraceae Flowering period: July to September also November to April in Southern Europe Distribution: widespread in the northern hemisphere, typical "root crop - weed" element of the steppes, disturbed areas and ruderal habitats, on nutrient rich soils, annual to perennial, herbaceous plants, subshrubs or shrubs, species-rich Appearance: widespread in the northern hemisphere, typical "root crop - weed" element of the steppes, disturbed areas and ruderal habitats, on nutrient rich soils, annual to perennial, herbaceous plants, subshrubs or shrubs, species-rich Important species in Europe: Artemisia vulgaris mugwort or common wormwood : common almost everywhere in northern regions, absent in hot summer dry areas Allergenicity: high allergenicity, major allergens Art v Link zum Pollenatlas: Artemisia vulgaris Wissenschaftlicher Beirat: Ass.
Young shoot of mugwort Image rights: Katharina Bastl. Flowers of mugwort Image rights: Katharina Bastl. This shrubby, woody-stemmed weed is found in wasteland and can grow to a height of 2 meters. The leaves are slitted, with white hair on the underside. Flowers are very small, and yellow to reddish-brown colour. In Europe, the start of the season is late July.
Mugwort shows high allergenicity. Alternaria is a fungus which appears as dark lines, dots, or circles up to the diameter of a plate, and is often found in bathrooms. It grows naturally outdoors on plant material, but also indoors on wood, silicone seals, walls or textiles, wherever condensation or other sources of damp provide enough water.
Spore loads are sometimes very high after summer rain, and thermal convection helps the spores to become airborne when the soil dries out. Alternaria spores have moderate to high allergenic potency.
Cladosporium is a common mould all over the world. Outdoors, it is frequently found on rotten organic material such as plants and wood, indoors, it can be found on walls and objects affected by water damage, and even on food in refrigerators.
The small spores have a distinctly roughened surface, pale brown to dark brown in colour. Like alternaria, the season starts mid-June, peaks in July and August and ends with airborne spores in September and October.
Cladosporium spores have moderate allergenic potency. Allergic reactions to house dust mites are very common. Sometimes known as dust allergy, classic symptoms include runny, itching, or blocked nose, itching or swollen eyes, and cough, particularly in the morning after getting up. These are smaller than ordinary pollen grains, coated with a thin hull layer which decays in time, releasing even smaller allergenic particles.
Cat and dogs are perennial allergens, and their dander hair and skin cells is the biggest cause of pet allergies in the UK. Pets shed hair and skin cells all the time, especially during grooming. This dander settles on bedding, carpets and furniture, and floats around in the air when disturbed. Touching and stroking cats and other animals can also spark allergic reactions such as skin irritations and itchy rashes.
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