Thank you for your inquiry.
The relationship between allergic rhinitis and asthma has been studied very extensively, and there are a number of excellent references that review this issue. However, the incidence of seasonal allergic rhinitis and asthma has been less well delineated. Nonetheless the references, which I have listed below, will let you evaluate the literature in this regard.
The 2012 article appearing in Therapeutic Advances of Respiratory Disease will be particularly helpful to you. A significant segment of this paper is devoted to the epidemiologic relationship between rhinitis and asthma. This article is available to you free of charge online.
The 2008 article from the Journal of Investigative Allergology and Clinical Immunology is also available to you online without charge, and has a more brief but still helpful discussion of the issue posed by your question.
Finally, the Journal of Allergy and Clinical Immunology article discusses the result of a survey on allergies in America, and your question is dealt with in this article as well. This article, however, is only available by subscription, but I am sure it can be obtained from your medical library.
If you wish for more detailed information, the bibliography of these articles will give you most if not all of the published literature on the topic.
Thank you again for your inquiry and we hope this response is helpful to you.
2012 6: 11 originally published online 16 December 2011
Ther Adv Respir Disp; Tunis Ozdoganoglu and Murat Songu. The burden of allergic rhinitis and asthma DOI: 10.1177/1753465811431975
J Investig Allergol Clin Immunol 2008; Vol. 18(5): 327-334
Burden of allergic rhinitis: Results from the Pediatric Allergies in America Survey
(J Allergy Clin Immunol 2009;124:S43-70.)
Phil Lieberman, M.D.