Impact of Temperature Warming and Droughts on Ragweed Pollen Count in Ukraine
Sunday, March 6, 2016
South Exhibit Hall H (Convention Center)
Viktoria Rodinkova, Lawrence M. DuBuske, MD, FAAAAI
Rationale: A changing pattern of ragweed pollen season is being observed in Ukraine due to global warming impacting on pollination intensity.

Methods: Pollen counts were obtained by volumetric methods employing a Burkard trap placed at a height of 25 meters above the ground on the roof of a Vinnitsa Medical University building from 2009 to 2015. Samples were taken from March 1 until October 31 each year.

Results: Ambrosia demonstrated the usual pollen count increase in the third ten-day period of August, occurring August 25 to 29 in years 2009 to 2014. Years 2010, 2013 and 2014 were characterized by pollen count increases on August 14, 11 and 6 accordingly as well. The rise of concentration corresponded with the seasonal maximum in 2010 (102 p.g./m3) due to warm weather in Ukraine. The third pollen maximum was seen September 6 to 18 for various years. The total pollen count was lower in seasons when the total rainfall in July was less than 50 mm per month (2009, 2013 and 2015). The pollen count was very low during the first and second ten-day periods of August 2015 as well most likely due to very low total rainfall (14.23 mm on July, 2015).

Conclusions: The pollination mode of Ragweed in Vinnitsa, Ukraine can be described as a “three-maximum” season including pollen concentration increase in the first half of August, in the last ten-day period of August and in September. Although shift of pollen seasons is related to temperature increase, pollen counts can be significantly decreased by droughts.