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G. L. Tylka, Gebhart, G. D., and Marett, C. C., Evaluation of soybean varieties resistant to soybean cyst nematode in Iowa, Iowa State University IPM Bulletin, vol. 52, 2002.
G. L. Tylka, Hussey, R. S., and Roncadori, R. W., Axenic germination of vesicular-arbuscular mycorrhizal fungi: effects of selected Streptomyces species, Phytopathology, vol. 81, no. 7, pp. 754-759, 1991.
G. Tylka, Winter annual weeds and SCN: What's the connection, Integrated crop management, 2007.
G. L. Tylka, Gebhart, G. D., Marett, C. C., and Mullaney, M. P., Evaluation of Soybean Varieties Resistant to Soybean Cyst Nematode, 2011.
G. Tylka, Soh, D., and Coats, J., Glucosinolate breakdown products for management of Heterodera glycines, J. Nematol, vol. 609, 1997.
G. Tylka, Soybean Cyst Nematode Females now Apparent on Soybean Roots, Integrated crop management news, 2008.
G. L. Tylka, Trial Results Show Dual Benefits of SCN Resistance, 2014.
G. L. Tylka, Possible Breakdown of SCN Resistance Topic of New Webcast, 2012.
G. Tylka, Soybean cyst nematode: Still a major threat to soybean production, Integrated crop management, 2007.
G. L. Tylka, 2012 Season is Not a Good One to “Roll the Dice” with SCN, 2012.
G. Tylka, Results of SCN-resistant soybean variety testing become available, Integrated crop management, 2007.
G. L. Tylka, Management of Nematode Diseases: Options, in Encyclopedia of Plant and Crop Science, Taylor & Francis, 2004, pp. 684-688.
G. L. Tylka, Soybean cyst nematode-resistant soybean varieties for Iowa. PM 1649. Iowa State Univ, Ext. Serv., Ames. Soybean cyst nematode-resistant soybean varieties for Iowa. PM, vol. 1649, Submitted.
G. L. Tylka, Gebhart, G. D., Marett, C. C., and Mullaney, M. P., Evaluation of Soybean Varieties Resistant to Soybean Cyst Nematode in Iowa--2008. Iowa State University University Extension, 2010.
G. Tylka, new take on soil sampling fields for SCN, Integrated crop management, 2007.
G. L. Tylka, Da Silva, M. Batista, R Saeugling, A., and Marlay, S., Effects of Nematode-Protectant Seed Treatments on Corn Yields and Nematode Population Densities, 2011.
G. L. Tylka, SCN Females Already Seen on Soybean Roots, 2013.
G. L. Tylka, Gebhart, G. D., and Marett, C. C., Iowa 2005 soybean cyst nematode-resistant soybean variety trial results, Crop Manage, 2003.
G. L. Tylka and Hunter, B. B., QUANTITATIVE RECOVERY OF CYLINDROCLADIUM-SCOPARIUM FROM NURSERY SOILS IN PENNSYLVANIA, PHYTOPATHOLOGY, vol. 75, no. 5. AMER PHYTOPATHOLOGICAL SOC 3340 PILOT KNOB ROAD, ST PAUL, MN 55121, pp. 629-629, 1985.
G. L. Tylka, Stunted, Yellowing or Wilting Corn: Could Nematodes Be the Cause?, 2012.
G. Tylka, SCN-resistant soybean varieties: Not all are created equal, Integrated crop management, 2007.
G. L. Tylka, Da Silva, M. Batista, and Pecinovsky, K. T., Effects of Seed Treatments and a Soil-applied Nematicide on Corn Yields and Nematode Population Densities, 2012.
G. L. Tylka, Comparing Nematode Management Products on Corn in Strip Trials, 2011.
G. Tylka, Fall is Ideal Time to Check for Presence of SCN, Integrated crop management news, 2008.
G. L. Tylka and Marett, C. C., Comparing Yields and Nematode Control of Soybean Varieties with Different Sources of SCN Resistance in Strip Trials, 2008.
G. Tylka, A biorational approach to soybean cyst nematode management in Iowa, Leopold Center Progress Reports, vol. 3, pp. 41-44, 1994.
G. L. Tylka, Niblack, T. L., Walk, T. C., Harkins, K. R., Barnett, L., and Baker, N. K., Flow cytometric analysis and sorting of Heterodera glycines eggs, Journal of nematology, vol. 25, no. 4, p. 596, 1993.
G. Tylka, It is Time to Sample for Corn Nematodes, Integrated crop management news, 2009.
G. L. Tylka, Todd, T. C., Niblack, T. L., MacGuidwin, A. E., and Jackson, T., Sampling for Plant-parasitic Nematodes in Corn Strip Trials Comparing Nematode Management Products, Submitted.
G. L. Tylka, Symptoms of SCN Damage Apparent Early, Yield Loss Likely Great in 2012, 2012.
G. Tylka, Winter Annual Weeds and SCN–Is There Cause for Concern, Integrated crop management news, 2008.
G. L. Tylka and da Silva, M. Batista, Effects of Seed Treatments and a Soil-applied Nematicide on Iowa Corn Yields and Nematode Population Densities—2011, 2012.
G. Tylka, Now is the Time to Sample for Corn Nematodes, Integrated crop management news, 2008.
G. L. Tylka, Managing Soybean Cyst Nematode for Maximum Soybean Productivity, 2008 Illinois Crop Protection Technology Conference, p. 7, Submitted.
G. Tylka, Spring Sampling OK for Two Corn Nematode Species, Integrated crop management news, 2008.
G. Lee Tylka, Interactions of vesicular-arbuscular mycorrhizal fungi with Heterodera glycines and soil actinomycetes, University of Georgia, 1990.
G. L. Tylka, SANORGO, С., and Souhrada, S. K., Relationships among soybean cyst nematode population densities, soybean yields and soil pH, Proceedings of the National Soybean Cyst Nematode Conference, Orlando, FL, USA, p. 25, 1999.
G. L. Tylka and Flynn, P., Interpreting SCN soil sample results. Iowa State University, University Extension, 1999.
G. L. Tylka and Marett, C. C., Distribution of the Soybean Cyst Nematode, Heterodera glycines, in the United States and Canada: 1954 to 2014, Plant Health Progress, no. doi:10.1094/PHP-BR-14-0006, 2014.
G. L. Tylka, Hundreds of SCN-resistant Soybean Varieties Available for 2014, 2014.
G. L. Tylka, New Approach to Assessing Possible Nematode Damage to Corn, 2012.
G. Tylka, New cyst nematode species on corn, Integrated crop management, 2007.
G. L. Tylka, MAXIMIZING EFFECTIVENESS OF EXTENSION EDUCATION EFFORTS, JOURNAL OF NEMATOLOGY, vol. 42, no. 3. SOC NEMATOLOGISTS PO BOX 311, MARCELINE, MO 64658 USA, pp. 274-275, 2010.
G. L. Tylka, Fall Time to Sample for SCN—But Not for Nematodes That Feed on Corn, 2011.
G. Tylka, Check SCN Resistant Soybean Roots for SCN Females, Integrated crop management news, 2009.
G. L. Tylka, Hussey, R. S., and Roncadori, R. W., INTERACTION OF SOYBEAN AND HETERODERA GLYCINES AS AFFECTED BY VESICULAR-ARBUSCULAR MYCORRHIZAL FUNGI AND PHOSPHORUS FERTILITY, JOURNAL OF NEMATOLOGY, vol. 20, no. 4. SOC NEMATOLOGISTS 3012 SKYVIEW DRIVE, LAKELAND, FL 33801-7072, pp. 662-662, 1988.
G. Tylka, SCN females on roots signal infestations and possibly ineffectiveness of resistance, Integrated crop management, 2007.
G. L. Tylka and Wisner, R. N., Soybean rust and the food processing industry, Food technology, vol. 59, no. 6, 2005.
G. L. Tylka, Fall Soil Sampling for SCN Can Pay Big Dividends in 2013, 2012.
G. Tylka, Fall Is Great Time to Sample For SCN, But Not Corn Nematodes, Integrated crop management news, 2009.

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