Skip to main content
ARS Home » Plains Area » Sidney, Montana » Northern Plains Agricultural Research Laboratory » Pest Management Research » People » Stefan Jaronski

Stefan Jaronski
headline bar



Stefan Jaronski.Stefan T. Jaronski

Research Entomologist


Phone: 406.433.9486
Fax: 406.433.5038


EducationCurrent ResearchResearch ExperienceRelated Web PagesPublicationsSymposiaAbstracts



Additional Pages: Research Projects,*Publications*

*Taken from the Agricultural Research Information System (ARIS) database.




   B.S. 1969 Manhattan College, Riverdale NY
   M.S. 1972 Cornell University, Ithaca NY
   Ph. D. 1978 Cornell University, Ithaca NY




Development of Grasshopper Biocontrol Agents a Lengthy Process 
(PDF; 315KB)   The Roundup ( By Lois Kerr, June 2010, p. 17-18



NPARL Research Entomologist Stefan Jaronski and Biological Science Technician Julie Grace hosted a Solid Substrate Fermentation Workshop for ARS scientists from related programs Feb. 16 - 18, 2005 at the Sidney ARS facility.  In addition to the workshop, Grace developed a short how-to manual illustrating the techniques discussed during the workshop.  Click here to download The Art of Fermentation. (PDF; 1.39 MB)




My research at Sidney centers on biocontrol of grasshoppers on U.S. rangeland, as well as continuation of older research on management of soil dwelling insect pests of various crops, including sugar beets and corn. My grasshopper work concerns evaluating new technologies and new insect pathogenic fungi for the microbial control of grasshoppers, in close collaboration with USDA APHIS CPHST. This research includes identification of baits, and chemical synergists, as well as new, better fungi and other microorganisms, and taking such technologies from the lab bench to the field.  In the process I have created small scale solid substrate mass production systems based on my industrial experience which not only allows Kg amounts of fungus spores for testing, but also to provide technical advice about such technology worldwide. As a side project I am studying the population genetics of Beauveria bassiana derived from grasshoppers using molecular techniques and comparing the molecular data with other phenotypical charactersitics of the more than 400 Beauveria isolates.  My soil insect-targeted research is directed towards developing a practical mycoinsecticide, based on discovery of Metarhizium microsclerotia, that can be transferred to industry for commercialization for use against soil pest insects (sugarbeet root maggot, cabbage maggot, corn rootworm).  The sugarbeet research is within the larger context of a biologically based management system for both pests and pathogens, using microorganisms, cultural practices, resistant/tolerant hybrids, and induced systemic response.




I joined NPARL in March 2000 as an insect pathologist after a 17-year career in industry. After a Ph.D. program and two postdoctoral appointments concerning microbial control of mosquitoes, I did an abrupt left turn and (a) left the academic community for industry, (b) changed from medical entomology to agricultural pests. From 1983 to 1992, I worked at Abbott Laboratories as an insect pathologist, during which time my research involved commercial development of Beauveria bassiana and Bacillus thuringiensis for use against a wide variety of insects. In 1992 I switched to Mycotech Corp., Butte MT, a small, venture-capital biotech group commercializing Beauveria-based mycoinsecticides. There, I spent 8 years involved in all aspects of commercial development of the fungus - from the early basic research through field trials to generation of registration data, from basic mycology to formulation chemistry, from science to marketing. My last position prior to joining ARS was Manager of Biopesticide Research and Development for Mycotech.




Homing in on HopperHordes


Grasshopper Research atNPARL

Grasshoppers: Their Biology, Identification and Management

Microbes for Sugar Beet Maggots (PDF; 24 KB)

PestManagement Research Unit Projects



ARS: NEWS & EVENTS (This link leads to Dr. Jaronski's query within ARS's news and events)




Please note: The most recent publications by this scientist may not yet be listed here. Please check the ARIS "Publications" page for possible new titles.





Back to Top