Allergen Update

Quebec City, Quebec

Predominant pollen:

The tree pollen seasons can fluctuate from year to year by as much as two to four weeks at this site due to the effect of weather. The pollen seasons described here try to cover the time when each can occur.

Acer sp.- Maple has an early season that lasts approximately one week and can occur from late March to early April. The main season can start from the first to the last week of April and can end mid to early June. Moderate and high counts are observed. Certain species are important in causing allergic reactions.

Alnus sp.- Alder counts fluctuate throughout the season from year to year due to the number of species found and the effect of weather. A short early season, with low counts, may occur from the second to the last week of March. The main season can start from late Marh to mid-April and end early to late June. Some years high counts are observed. They are considered important allergens.

Betula sp.- Very high birch counts are observed but the season dates and counts flutuate from year to year due to the effect of weather. The season can start from late April to mid-May and end the first to third week of June. They are considered important allergens.

Birch look-a-likes sp.- The birch look-a-likes' season lasts approximately two to three weeks with low to moderate counts and it can occur thoroughout the month of May to mid-June.

Tsuga sp.- The hemlock season can vary a great deal from year to year. This is due to the effect of weather and natural cyclical patterns. Some years sporadic only low counts are observed, whereas other years moderate and high counts are captured. The season starts from mid-May to early June and ends early to mid-June. May cause allergic reactions in individuals who are highly sensitized when shed in high numbers.

Juglans sp.- The walnuts are considered important in causing allergic reactions. The pollen season can start from the second week of May to early June and can end early to late June. The season can vary a great deal from year to year due to weather and cyclical patterns. Low and sometimes sporadic counts will be observed whereas an occasional year can produce moderate and high counts.

Cupressaceae family- The cedars, junipers, and yews produce low to high counts. The season can start from early March to early April and end mid-May to early June. The species found in Canada are generally not considered allergenic.

Pinaceae family- High counts are observed throughout the season. The pollen season can start from the first to third week of May and end late June to mid-July. The variation in when the season occurs is due to the effect of weather. This is a very important group of trees to individuals who are sensitized.

Populus sp.- The poplars, cottonwood and aspen produce high counts. The season can start from the third week of March to the second week of April and end early to late May. Allergic reactions may occur in highly sensitized individuals.

Quercus sp.- The oak season can start from the first to the third week of May and end late May to early June. The season can be affected by weather. Most years high counts are produced and certain species are known to cause allergic reactions.

Larix sp.- The larch and tamarack can vary a great deal from year to year due to the effect of weather and cyclical patterns. Some years only low and sporadic counts are observed while other years moderate counts are captured. The season can start from the third week of April to early May and end early to late May.

Ulmus sp.- The elm are considered important allergens. An early season can occur from mid-March to early April. The main season can start from early to late April and the season end is from early to late May. High counts are observed.

Fraxinus sp.- Ash counts observed can be in the low to high range and will cause allergic reactions in those individuals who are highly sensitized. The season lasts well over a month. The season can start the third week of April to mis-May and end the third week of May to almost mid-June.tart from mid-April to the third week of April and end late May to early June.

Fagus sp.- The beech season can start from early to late May and end late May to the second week of June. The seasons vary from year to year due to the effect of weather and normal cyclical patterns. Some years moderate counts are observed and other years only low sporadic ones are captured.

Gramineae family- Early low sporadic counts can occur in early May.The main grass season can start from the second to last week of May and ends early to mid-October. Moderate counts for the grasses occur from June to mid-July. The grasses are important allergens

Plantago sp.- The plantain season can start the second week of June to early July and end late September to early October. Only low counts are observed. Can be a sginificant allergen even at low levels.

Ambrosia sp.- The ragweed season can start from early to mid-July and ends well into October with a solid frost. Moderate and high counts are observed from early August to mid-September. They are considered to be a significant allergen.

Urticaceae sp.- The nettles and parietaria are considered important allergens due to their small size. Mostly low, with the occasional moderate, counts are observed. The season can start from late June to the first week of July and end late August to mid-September.

Predominant Spores:

Diatrypaceae sp.- The counts are very sporadic and vary throughout the whole counting season. Very high counts are observed from March to late October. They are not known to cause allergic reactions.

Caloplaca sp.- Season is very sporadic. Moderate counts are observed from July to mid-October. May not be a significant allergen.

Leptosphaeria sp. & Leptosphaeria look-alikes- These two are grouped together since they are in the same class of fungi and are similar microscopically. The season is from late April to mid-October with great fluctuations in counts from day to day which is due to the effect of weather and the number of species present. Some very high counts are observed for both groups. Can cause allergic reactions.

Erysiphe (Oospora) sp.- Powdery mildew - The season is from the end of April to late October. The counts range from low to high. May not be an important allergen.

Boletus sp.- The main season is from June to mid-October. Moderate and high counts are observed from July to mid-October. It is considered to be an important allergen.

Coprinus sp.- Moderate and high counts are observed and the season is from May to late fall. Considered significant in causing allergic reactions.

Ganoderma sp.- Moderate and Very high counts are observed from late May to late fall. Considered significant in causing allergic reactions.

Ustilaginales sp.- The smuts produce low to high counts from late May to mid-October. Allergenic properties are not well understood.

Uredinales sp.- The rusts produce low to moderate counts from late May to mid-October. Allergenic properties are not well understood.

Penicillium sp. & Aspergillus sp.- Significant counts occur throughout the whole counting season with the high counts occurring from March to late fall.

Alternaria sp.- Most of the significant counts are found from June to mid-October and are in the low to high range. May not cause disease except in highly sensitized individuals.

Cladosporium sp.- Found throughout the whole counting season. High counts are observed late March to late fall. Some species are known to cause allergic reactions.

Botrytis sp.- Counts are mostly in the low to moderate ranges from late May to early October.

Helicomyces sp.- The season is very sporadic with low to high counts observed from late April to the end of September. (Allergenic properties unknown).

Fusarium sp.- Sporadic season with low to high counts observed from April to mid-October.

Pithomyces sp.- Moderate counts are observed from July to early October.

Epicoccum sp.- Low and moderate counts are observed from June to mid-October. Some species are known to cause allergic reactions.

Polythrincium sp.- Low and moderate counts are observed from late June to mid-October.

Myxomycetes- Low to moderate counts are observed from late March to mid-October.

Last Updated : 3 March 2015

The information presented here is designed to inform, not replace, the relationship that exists between a patient and a medical professional.

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