Allergen Update

Moncton, New Brunswick

Predominant pollen:

The tree pollen seasons can fluctuate from year to year by as much as two to three 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.- The maple season is effected by the weather in when it will occur and how much pollen will be released. The main season, where low to high counts will be observed, lasts almost two months. The season can start late March to mid-April and end late May to mid-June. Very high counts are observed and some species are known to cause allergic reactions.

Alnus sp.- The alder season varies greatly from year to year and can be the result of the effect of weather and cyclical patterns. The counts vary from low to high. There is a small early season with low counts from mid to late March. The main season can start from the third week of March to the second week of April and end the first to the last week of June. They are considered to be important allergens.

Betula sp.- The season can start from mid-April to early May and end early to late June. Very high counts are observed. They are considered important allergens.

Birch look-a-likes sp.- The birch-look-alikes' season can be sporadic. Low and moderate counts are observed. The season occurs mostly in May to early June.

Tsuga sp.- The hemlock season can vary from year to year due to cyclical patterns and the effect of weather. Some years only low sporadic counts are observed, other years moderate counts are possible. The season can start the third week of May to the end of may and end the first to the third week of June.

Cupressaceae family- The cedars, junipers, and yews can produce high counts from April to early May. There is a short season mid to late March. The main season can start from the third week of March to mid-April and end late May to the second week of June.

Fraxinus sp.- The ash season can start from the third week of April to early May and ends the third week of May to almost mid-June. Most counts are low with an occational moderate observed. May 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. Most years only low counts are observed while other years moderate counts are possible. The season can start from the third week of April to early May and end the first to the third week of May.

Pinaceae family- The season for the pine, spruce and firs lasts more than two months and very high counts are observed. The season can start from the first to the third week of May and end the first to the third week of July. They are very important allergens for those individuals who are sensitized.

Populus sp.- The poplar, cottonwood and aspen season lasts well over a month. The season can start late March to mid-April and end early May to the last week of May. Some very high counts are observed and they can cause allergic reactions at these levels.

Salix sp.- The willow season can be sporadic with mostly low and rare moderate counts. During warm springs like 201 and 2012 the season can start the second week of April. Generally the season starts the third week of April to early May and ends the third week of May. May cause allergic reactions in highly sensitized individuals.

Quercus sp.- The oak season varies a great deal from year to year due to the effect of weather. An early short season may occur from late April to mid-May. The more stable season with moderate and low counts can occur from the second to the last week of May. Some species are known to cause allergic reactions.

Fagus sp.- The beech season can vary from year to year due to cyclical patterns and the effect of weather. Low counts are generally observed. The season can start the first to the third week of May and end the third week of May to mid-June.

Ulmus sp.- The elm season and pollen levels is very dependant on the site location. An early low season can occur from mid to late March. The main season can have moderate and occational high counts, depending on the site location. Season start is from the first to the third week of April and ends late April to the second week of May.

Gramineae family- The highest counts for the grass season occur from mid-June to the third week of July. The season can start from the second to the third week of May and end late September to early October. They are considered important allergens.

Ambrosia sp.- The season can start from the third week of July to early August and lasts until mid-October or until a hard frost occurs. Mostly low counts are observed with the occasional moderate counts possible.

Plantago sp.- The plantain season can start from the first to the third week of June and end the third week of September to early October. The counts are in the low range but they may cause allergic reactions in highly sensitized individuals.

Urticaceae sp.- The nettles occur only in low numbers. The season can start late June to early July and end late August to mid-September. They are considered important allergens due to their small size.

Predominant Spores:

Diatrypaceae sp.- The counts are very sporadic and vary throughout the whole counting season. They are not known to cause allergic reactions.

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 the end of May to mid-October with great fluctuations in counts from day to day. This is probably due to the effect of weather. The significant counts are mostly in the moderate range.

Erysiphe (Oospora) sp.- Powdery mildew - The season, with significant counts, is from late April to mid-October. Highest counts are mostly in the moderate range.

Caloplaca sp.- Moderate and high counts are observed from April to early October. The counts are very sporadic.

Boletus sp.- Season is from mid-June to mid-October and very high counts can occur. Considered an important allergen.

Coprinus sp.- Very high counts are observed. Season is from mid-May to late fall. Very high counts are observed from July to Mid-October. Considered an important allergen.

Ganoderma sp.- Very high counts are observed from mid-June to late fall. Considered an important allergen.

Ustilaginales sp.- The smuts produce low and moderate counts from late May to mid-October.

Uredinales sp.- The rusts as well produce low and moderate numbers from mid-May to mid-October.

Penicillium sp. & Aspergillus sp.- Significant counts occur throughout the whole counting season with high counts occuring from late May to early October.

Alternaria sp.- Most of the significant counts are found from mid-June to the end of September.

Cladosporium sp.- Found throughout the whole counting season. The highest counts are observed from late March to early October.

Fusarium sp.- Counts are very sporadic throughout the whole counting season. The majority of the season occurs from May to mid-October with some high counts. It is known to cause allergic reactions.

Botrytis sp.- The counts are very sporadic. They can occur in the moderate ranges from late April to October.

Helicomyces sp.- Counts fluctuate throughout the season with low to high counts from late April to mid-October.

Pithomyces sp.- Moderate counts are observed in August and September.

Polythryncium sp.- Moderate counts are observed from July to late September.

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

Myxomycetes- Moderate counts are observed from mid-June to late September.

Last Updated : 4 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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