Allergen Update

Regina, Saskatchewan

Predominant pollen:

Due to variations in the weather at this site, the tree pollen season fluctuates significantly from year to year. The pollen seasons described here try to cover the time when each can occur.

Acer sp.- Maple season varies from year to year due to the the effect of weather. A small early season with sporadic counts can occur from mid-April to early May. The main season, which can be more stable, can start from late April to the second week of May and end the third week of May to early June. The counts do get very high and some species are known to cause allergic reactions. The season lasts approximately one month.

Alnus sp.- Alder season starts from early to late April and ends late June. The counts are in the low to moderate range and may cause allergic reactions in highly sensitized individuals.

Betula sp.- The birch season varies slightly from year to year due to the effect of weather. The season can start from the third week of April to the first week of May and end late May to late June. The amount of pollen observed varies from year to year. Low and moderate counts are observed depending on the year.

Populus sp.- The Poplar, cottonwood and aspen season can start late March to the third week of April and end the second week of May to early June. Because of the effect of weather, the season can vary by approximately three weeks. Some of the counts are very high and may cause allergic reactions.

Cupressaceae family- The cedars, junipers and yews can produce significant counts, from low to high. The season can start the end of March to the third week of April and end early to late June. Most species in Canada are not considered to be significant in causing allergic reactions.

Fraxinus sp.- The ash pollen season can start the second week of April to the second week of April to the second week of May and end the third week of May to early June. Very high counts are observed. Can cause allergic reactions in sensitized individuals.

Pinaceae family- This includes the spruce, fir and pine trees. The season can start from the first to the third week of May and end early to late July. Mostly low to moderate, with occational high, counts are observed. The season varies a great deal from year to year due to the effect of weather. This group is very important for those who are sensitised.

Quercus sp.- The oak season can start from the third week of April to the third week of May and end late May to late June. The season is highly affected by weather. Mostly low, with the occasional moderate or high, counts are observed. Oaks, depending on the species, are allergenic.

Ulmus sp.- The elm can be important allergens. Low to high counts are observed and the season can last three to four weeks. The pollen season can start mid-April to early May and end early to late May.

Salix sp.- The season for willows can start from mid-April to early May and end between late May to mid-June. There is a great variation in the season from year to year due to weather, and low to moderate counts are observed. Considered to be allergenic in highly sensitized individuals.

Gramineae family- The grass season starts from the second week of May to early June and ends late September to early October. Low, moderate and occasional high counts are observed.

Ambrosia sp.- The ragweed season can start from late June to early August and end in October with a heavy frost. Occasional moderate counts are observed.

Urticaceae sp.- The nettles and parietaria produce mostly low, with the occasional moderate, counts and the season can start from the second to the third week of June and end early September. They are considered important allergens due to their small size.

Chenopodiaceae & Amaranthaceae- These groups of weeds are similar microscopically and are not differentiated. They include some weeds which are considered allergenic. Counts are in the low to moderate ranges, and the season can start early to mid-June and end early October.

Artemisia sp.- The sagebrush and mogwort season starts from early to mid-July and ends well into October. Low to moderate counts are observed. They may cause allergic reactions in highly sensitised individuals.

Plantago sp.- The plantain counts are always low but even at these levels allergic reactions can occur in highly sensitized individuals. The season starts from late May to early June and ends late August.

Predominant spores:

Diatrypaceae sp.- The counts are sporadic throughout the whole counting season. High counts can be observed from April to early October. They are not known to cause allergic reactions.

Erysiphe (Oospora) sp.- Powdery mildew - The season is from April to mid-October. Low to high counts are observed.

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 March to early October. The counts vary from day to day, which is probably due to the effect of weather. Very high counts are observed from late May to mid-October.

Boletus sp.-The season for this spore is very sporadic with the occasional moderate counts observed. It may not be of significance in causing allergic reactions at these levels. The season, with moderate counts, is mostly in August.

Coprinus sp.- This mushroom can produce some high counts from June to August. The season is from late May to early October, with significant counts. It is considered an important allergen.

Ganoderma sp.- This bracket fungus can produce moderate counts from July to early October. It is considered an important allergen.

Uredinales sp.- The rusts do occur in high numbers but not enough is known about their significance in causing allergic reactions at these levels. The season is from July to early October and the counts are mostly low to moderate with some in the high range.

Ustilaginales sp.- The allergenic properties of the smuts are unknown. The season is from late May to early October with some very high counts.

Alternaria sp.- The counts do get high and some species are known to cause allergic reactions. The season is from April to mid-October. The highest counts occur from July to early October.

Penicillium sp. & Aspergillus sp.- These spores are found throughout the whole counting season and are probably present in significant numbers beyond that. High counts are observed from March to late fall. May be considered important allergens.

Botrytis sp.- This may be a significant allergen and high counts are observed. The season is from mid-May to the end of September.

Cladosporium sp.- The most abundant spore found throughout the whole season. Some species are known to cause allergic reactions. This spore exists all year round and very high counts are known to occur from March to well into late fall.

Epicoccum sp.- Some species are known to cause allergic reactions. The season is from the end of April to mid-October with low to high counts.

Fusarium sp.- Counts are very sporadic throughout the whole counting season. The majority of the season occurs from May to the end of September with mostly low to moderate counts.

Helicomyces sp.- Season is from May to the end of September, producing moderate and high counts. The season is sporadic. Allergenic properties are unknown.

Pithomyces sp.- Season is mostly in the low to moderate range, with some high counts observed, from late May to the end of September. Allergenic properties are unknown.

Caloplaca sp.- The season is from June to the end of September. The counts are sporadic and in the low to high ranges. Allergenic properties are unknown.

Drechslera sp.- The counts are in the low to moderate range. This is a summer and fall spore (July to September). There are other related genera, which are also found in air samples, that can cause respiratory problems. One example is Bipolaris sp.

Stemphylium sp.- The season occurs mostly from August to the end of September with moderate counts observed.

Myxomycetes- Moderate and low counts are observed from April 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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