AHSC logo Allergy and Asthma in the
Southwestern United States
Information for patients with allergy and related problems
in the Southwest

Tucson Pollen Today and Tomorrow - October

Pollen counts are continuing to increase.  This year's summer monsoon has promoted a prolific growth of weeds, including  Ambrosia ambrosiodes (canyon ragweed),  Ambrosia deltoidea (triangle leaf bursage, rabbit bush), and Salsola (Russian Thistle or Tumbleweed).  Russian Thistle is beginning to flower, but neither Canyon Ragweed nor Rabbit Bush are flowering yet.   Ambrosia confertiflora (Slimleaf Bursage) and Amaranthus palmeri (Carelessweed) have reached maturity and are releasing pollen.  Non-native grasses including Bermuda grass (Cynodon dactylon), Eragrostis Lehmanniana (Lovegrass) and Buffelgrass (Pennisetum ciliare) have been releasing pollen.  Native grasses such as Aristida (Threeawn), Bouteloua (Grama Grass) and Eragrostis Lehmanniana (Lovegrass) have also been flowering.  These grasses have been flowering for at least 2 months and most are now going to seed.  The moist warm soil and higher humidity during the monsoon has caused mold growth, and now that the surface layers of soil are drying up, dust containing airborne spores will become a problem for mold-sensitive people.

Note This information is based on ongoing observation of flowering allergenic plants in the Tucson metropolitan area, and not on pollen counts.   Appearance and persistence in the air of any particular species of airborne pollen are expected to be later than the onset and duration   of flowering of the plant of origin.                                                                       Back


Disclaimer:   This site is for educational purposes only.  Any information that you have found in this web site is not intended to replace medical care or advice given to you by your own physicians. You should consider consulting your local medical library and other web sites for additional information. 

Comments and suggestions welcome!   Email: schumach@u.arizona.edu
Content Owner:  Michael J. Schumacher, MB, FRACP, The University of Arizona
Updated 9/30/2012