Allergen Update

Fredericton, New Brunswick

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.- The maple season is affected by the weather in when it will occur and how much pollen will be released. In the warm years, like 2010 and 2012, the season started the second th third week of Marh. Generally the season can start from early to mid-April and end mid to late May. 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 can reach high levels. The season can start from mid-March to mid-April and ends early to mid-June.

Betula sp.- Very high birch counts are observed, the season can last almost two months and can start from mid-April to early May and end early to late June.

Birch look-a-likes sp.- The birch look-a-likes' season is sporadic and can occur from late April to early June. Low to moderate counts are possible and may cause allergic reactions in individuals who are highly sensitized.

Juglans sp.- The walnuts are considered important in causing allergic reactions. The pollen season can start from early May to the third week of May and can end the second to last week of 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 counts.

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.

The cedars, junipers, and yews can produce high counts from April to early May. There are two distinct seasons.

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.

Tsuga sp.- The hemlocks usually only produce low counts but rarely moderate counts can occur. The season varies a great deal from year to year due to the effect of weather and cyclical patterns. The season can start from mid-May to early June and end from the first to the second week of June.

Pinaceae family- The season for the pine, spruce and firs lasts at least two months. Some very high counts are observed. The season can start from the second week to the third week of May and end the first to the third week of July. Very high counts are observed and they could be 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 the 3rd week of Marh in warm years like 201 and 2012. Generally the season starts from the first to the third week of 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.

Quercus sp.- The oak season can vary from year to year due to the effect of weather. The season can start the third week of April to mid-May and end late May to mid-June. Moderate and high counts are observed. Some species are known to cause allergic reactions.

Tilia sp.- The linden and basswood season can vary from year to year. The season can start around the first week of July and end the third week of July to early August. Mostly low counts are observed with the occasional moderate possible. Some years only sporadic low counts are observed. The variation in seasons is due to the effect of weather and cyclical patterns.

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. High counts are observed. May cause allergic reactions.

Salix sp.- The willow season can produce moderate and high counts. The season can start from late April to early May in warm years like 2010 and 2012. Generally the season starts from the first to the second week of May and ends late May to the second week of June. They can cause allegice reactions at these levels.

Fagus sp.- The beech season can vary a great deal from year to year due to cyclical patterns and the effect of weather. Low counts are generally observed but moderate counts are possible in certain years. The season can start early to late May and end late May to mid-June. May cause reactions in highly sensitized individuals.

Ulmus sp.- The elms have an early low season that can occur in March. The main season can start late March to early April in warm years like 2010 and 2012 but generally it starts around the third week of April. The main season can have very high counts. The season can end from the first week to last week of May. At these levels they are considered important allergens.

Gramineae family- The heaviest counts for the grass season occur in June and July. Low and moderate counts are observed and the season starts the first to the last week of May and ends late September.

Ambrosia sp.- Ragweed only produces low counts. The season can start the third week of July to the second week of August and end late September to early October, or with a hard frost.

Plantago sp.- The plantains pollinate from late June to late September. The counts are mostly in the low range with an occasional moderate possible. This may cause allergic reaction 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 early 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: 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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