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allergies




Pollen & Allergies

Ragweed Pollen

allergiesRagweed and other weeds such as curly dock, lambs quarters, pigweed, plantain, sheep sorrel and sagebrush are some of the most prolific producers of pollen allergens.

Although the ragweed pollen season runs from August to November, ragweed pollen levels usually peak in mid-September in many areas in the country.

In addition, pollen counts are highest between 5 - 10 AM and on dry, hot and windy days.

Preventive Strategies

Grass Pollen

As with tree pollen, grass pollen is regional as well as seasonal. In addition, grass pollen levels can be affected by temperature, time of day and rain.

Of the 1,200 species of grass that grow in North America, only a small percentage of these cause allergies. The most common grasses that can cause allergies are:

  • Bermuda grass
  • Johnson grass
  • Kentucky bluegrass
  • Orchard grass
  • Sweet vernal grass
  • Timothy grass

Preventive Strategies

Specifically:

In General:

Tree Pollen

Trees are the earliest pollen producers, releasing their pollen as early as January in the Southern states and as late as May or June in the Northern states.

Trees can aggravate your allergy whether or not they are on your property, since trees release large amounts of pollen that can be distributed miles away from the originial source.

Of the 50,000 different kinds of trees, less than 100 have been shown to cause allergies. Most allergies are specific to one type of tree such as:

  • catalpa
  • elm
  • hickory
  • olive
  • pecan
  • sycamore
  • walnut

or to the male cultivar of certain trees. The female of these species are totally pollen-free:

  • ash
  • box elder
  • cottonwood
  • date palm
  • maple (red)
  • maple (silver)
  • Phoenix palm
  • poplar
  • willow


Some people, though, do show cross-reactivity among trees in the alder, beech, birch and oak family, and the juniper and cedar family.

Preventive Strategies