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eturn to table of contents The plant may have uneven and/or poor head development and emergence, poor grain set, potentially increased stalk lodging, and harvest issues. Yield loss in sorghum can be severe with cases of 100% loss reported. ALTERNATE HOSTS Sugarcane aphids need living host plants to persist. In addition to sorghum, they can feed on shattercane (Sorghum bicolor), Johnsongrass (Sorghum halapense), as well as volunteer sorghum plants. Aphids also overwinter on these same plant species. In Mexico, the sugarcane aphid has been found colonizing barnyard grass (Echinochloa crus-galli). SCOUTING FOR SUGARCANE APHID Scouting should begin a few weeks after sorghum emergence. Scout at least once per week until aphids are found, then increase frequency to two field visits per week. In four or five areas within the field, inspect the underside of an upper leaf and a lower leaf for aphid presence. When populations begin to build, honeydew will be present on the top side of leaves. Take notes on the number of aphids present in each area. Several southern universities recommend an action threshold of 50 to 125 or more aphids per leaf on 25% or more of the plants. Understanding Differences in Hybrid Tolerance Sorghum hybrids vary in their ability to tolerate sugarcane aphid feeding. Significant work is underway with third party collaborators and at DuPont Pioneer to understand sorghum hybrid tolerance to sugarcane aphids. Pioneer ® hybrids 83P17 and 83P56 are known to possess at least some degree of aphid tolerance. However, tolerance is not the same as immunity, and tolerant hybrids must be scouted and sprayed if populations reach the action threshold. Contact your DuPont Pioneer field team for the latest information on hybrid results. Best Management Practices Best management practices include removing volunteer sorghum plants, using tolerant sorghum hybrids, utilizing high quality seed treatments, maintaining good grass weed management, scouting, and using insecticides, if needed. Here is a brief checklist: 1. Control volunteer sorghum to remove source of early infestation. 2. Plant a sorghum hybrid with aphid tolerance. 3. Use an effective insecticide seed treatment. 4. Plant early. 5. Scout fields early and weekly. 6. Apply an approved insecticide when the action threshold is reached. Avoid pyrethroid insecticides, which are harmful to beneficial insecticides and may cause aphid populations to rebound rapidly. 7. Consider using a harvest aid when sorghum nears maturity (25% grain moisture in the lower portion of the head) to kill and dry down the crop. Sooty mold on sorghum resulting from a heavy infestion of sugarcane aphid. Tractor in Central Mexico after traveling through an aphidinfested sorghum field. SUGARCANE APHID MANAGEMENT Insecticides for Sugarcane Aphid Several insecticides are labeled for use on sorghum in the U.S. Insecticide trials conducted by Texas A&M University have shown that Sivanto 200 SL insecticide (flupyradifurone) (Bayer CropScience) has provided significant reductions in aphid populations up to two weeks after application. Transform insecticide (sulfoxaflor) (Dow AgroSciences) was previously used in some states, but its registration was canceled by the EPA in November 2015. Existing inventories of sulfoxaflor may not be sold and distributed to end-users; however, some states are pursuing an emergency exemption (Section 18) from the EPA. When applying insecticides by ground equipment, University of Arkansas recommends that insecticides be applied in 10 gallons of water per acre. Growers should consult their Cooperative Extension Service for a current list of registered chemicals in their respective states and updated results on the efficacy of sugarcane aphid insecticides. Read and follow all label directions before applying an insecticide. 162 Plot in Central Mexico showing tolerant sorghum hybrids in the back compared to a susceptible hybrid in the front. ACKNOWLEDGMENTS Thanks to Dr. Robert Bowling, Texas A&M AgriLife, for providing information and insect close-up photograph. Field photos of sugarcane aphids on plant leaves, tolerant vs. non-tolerant plants, and tractor are courtesy of DuPont Pioneer Mexico Agronomy team.

eturn to table of contents REFERENCES Abendroth, L.J., R.W. Elmore, M.J. Boyer, and S.K. Marlay. 2011. Corn growth and development. PMR 1009. Iowa State University Extension, Ames, Iowa. Afuakwa, J.J., and R. Kent Crookston. 1984. Using the kernel milk line to visually monitor grain maturity in maize. Crop Sci. 24:687-691. Afuakwa, J.J., R. Kent Crookston, and R.J. Jones. 1984. Effect of temperature and sucrose availability on kernel black layer development in maize. Crop Sci. 24:285-288. Badu-Apraku, B., R.B. Huner, and M. Tollenaar. 1983. Effect of temperature during grain filling on whole plant and grain yield in maize (Zea mays L.). Can. J. Plant Sci. 63:357-363. Bajet N.B., B.L. Renfro, J.M. Valdez Carrasco. 1994. Control of tar spot of maize and its effect on yield. International Journal of Pest Management. 40:121-125. Baker, R. 1970. Black layer development - one way to tell when your corn is mature. Crops Soils 24(1): 8-9. Barrangou, R., Fremaux, C., Deveau, H., Richards, M., Boyaval, P., Moineau, S., Romero, D.A., Horvath, P., 2007 CRISPR provides acquired resistance against viruses in prokaryotes. Science 315:1709-1712. Bertram, M.G., and P. Pedersen. 2004. Adjusting management practices using glyphosate-resistant soybean cultivars. Agron. J. 96:462-468. Board, J.E., and B.G. Harville. 1992. Explanations for greater light interception in narrow- vs. wide-row soybean. Crop Sci. 32:198-202. Bobryk, C.W., D.B. Meyers, N.R. Kitchen, J.F. Shanahan, K.A. Sudduth, S.T. Drummond, B. Gunzenhauser, and N. N. Gomez Raboteaux. 2016. Validating a digital soil map with corn yield data for precision agriculture decision support. Agron. J. 108:3. Bundy, L.G., and P.R. Carter. 1988. Corn hybrid response to nitrogen fertilization in the Northern Corn Belt. J. Prod. Agric. 1:99-104. Butzen, S. 2010a. Blunt ear syndrome of corn. Field Facts. Vol. 8. No. 11. DuPont Pioneer, Johnston, Iowa. Butzen, S. 2010b. Micronutrients for crop production. Crop Insights. Vol. 20. No. 9. DuPont Pioneer, Johnston, Iowa. https://www.pioneer.com/home/site/ us/agronomy/micronutrients-crop-production/ Butzen, S. 2012. Best management practices for corn-after-corn production. Crop Insights. Vol. 22. No. 6. DuPont Pioneer, Johnston, Iowa. https:// www.pioneer.com/home/site/us/agronomy/library/best-managementpractices-corn-on-corn/ Butzen, S. 2014. Managing for delayed corn crop development. Crop Insights. Vol. 24. No. 10. DuPont Pioneer, Johnston, Iowa. Butzen, S., and S. Paszkiewicz. 2008. Narrow-row corn production – when does it increase yield? Crop Insights. Vol. 18. No. 15. DuPont Pioneer, Johnston, Iowa. CABI. 2016. Invasive species compendium. Melanaphis sacchari (yellow sugarcane aphid). http://www.cabi.org/isc/datasheet/33256 Cantarero, M.G., A.G. Cirilo, and F.H. Andrade. 1999. Night temperature at silking affects kernel set in maize. Crop Sci. 39:703-710. Ceballos H., and J.A. Deutsch. 1992. Inheritance of resistance to tar spot complex in maize. Phytopathology 82:505-512. CIMMYT. 2004. Maize diseases: A guide for field identification. 4 th Edition. Mexico, D.F., Mexico: International Maize and Wheat Improvement Center, p. 119 Clark, R.A. 2013. Hybrid and plant density effects on nitrogen response in corn. M.S. Thesis. University of Illinois at Urbana-Champaign. Cooper, R.L., and D.L. Jeffers. 1984. Use of nitrogen stress to demonstrate the effect of yield limiting factors on the yield response of soybean to narrow row systems. Agron. J. 76:257-259. Cox, W.J., and J.H. Cherney. 2011. Growth and yield responses of soybean to row spacing and seeding rate. Agron. J. 103:123-128. Davis, R.M. 2016. UC IPM pest management guidelines: corn. UC ANR Publication 3443. Daynard, T.B. 1972. Relationships among black layer formation, grain moisture percentage, and heat unit accumulation in corn. Agron. J. 64:716-719. Daynard, T.B., and W.G. Duncan. 1969. The black layer and grain maturity in corn. Crop Sci. 9:474-476. De Bruin, J.L., and P. Pedersen. 2008. Effect of row spacing and seeding rate on soybean yield. Agron. J. 100:704-710. Deltcheva, E., Chylinski, K., Sharma, C.M., Gonzales, K., Chao, Y., Pirzada, Z.A., Eckert, M.R., Vogel, J., Charpentier, E. 2011 CRISPR RNA maturation by transencoded small RNA and host facter RNase III. Nature 471:602-607. Dornbos, D.L. 1988. Soybean seed yield, viability and vigor, and chemical composition resulting from drought and high temperature stress during seed fill. Retrospective Theses and Dissertations. Paper 9337. Iowa State University. Dunphy, E.J., and J.M. Ferguson. 1991. Field performance of farmer-saved and professionally grown soybean seed lots. Proceedings of the American Seed Trade Association Annual Meeting. Elmore, R. 2010. Reduced 2010 corn yield forecasts reflect warm temperatures between silking and dent. Integrated Crop Management. Iowa State University, Ames, Iowa. Endicott et al. 2015. Corn growth and development. DuPont Pioneer, Johnston, Iowa. Eubank, T. W., D. H. Poston, and C. H. Koger. 2005. Remote sensing as a decision-making tool for desiccation of Mississippi soybean. Proc. South. Weed Sci. Soc. 58:46. Fawcett, J., J. Sievers, L. Rossiter, and J. Rogers. 2015. On-farm soybean row spacing trials. Iowa State Research Farm Progress Reports. Paper 2131. http://lib.dr.iastate.edu/farms_reports/2131 Frantz, J.M., N.N. Cometti, and B. Bugbee. 2004. Night temperature has a minimal effect on respiration and growth in rapidly growing plants. Annals of Botany. 94:155-166. Galinat, W.C. 1988. The origin of corn. In: C.F. Sprague and J.W. Dudley, editors, Corn and corn development. American Society of Agronomy Press, Madison, Wisconsin. p. 1-32. Gardner, C.A.C., P.L. Bax, D.J. Bailey, A.J. Cavalieri, C.R. Clausen, G.A. Luce, J.M. Meece, P.A. Murphy, T.E. Piper, R.L. Segebart, O.S. Smith, C.W. Tiffany, M.W. Trimble, and B.N. Wilson. 1990. Response of corn hybrids to nitrogen fertilizer. J. Prod. Agric. 3:39-43. Gaspar, P.E. 1998. Environment influence on herbicide-hybrid sensitivity. Proc. 53 rd Annual Corn and Sorghum Research Conference. American Seed Trade Association. Griffin, J., and J. Boudreaux. 2013. Gramoxone Inteon/Paraquat use as a soybean harvest aid: application timing. http://mssoy.org/ wp-content/uploads/2013/09/HARVEST-AIDS-LSU-PP-3.pdf Hanna, S.O., S.P. Conley, G.E. Shaner, and J.B. Santini. 2008. Fungicide application timing and row spacing effect on soybean canopy penetration and grain yield. Agron. J. 100:1488-1492. Hartzler, B., and M. Owen. 2015. 2015 Herbicide guide for Iowa corn and soybean production. Weed management update for 2015. Pub WC-94. Iowa State University Extension, Ames, Iowa. Heap, I. 2016. The international survey of herbicide resistant weeds. www.weedscience.com Hock, J., J. Kranz, and B.L. Renfro. 1995. Studies on the epidemiology of the tar spot disease complex of maize in Mexico. Plant Pathology 44:490-502. Hock, J., U. Dittrich, B.L. Renfro, and J. Kranz. 1992. Sequential development of pathogens in the maize tarspot disease complex. Mycopathologia 117:157- 161. Hock, S.M., S.Z. Knezevic, A.R. Martin, and J.L. Lindquist. 2006. Soybean row spacing and weed emergence time influence weed competitiveness and competitive indices. Weed Science. 54:38-46. Hoeft, R.G., S.R. Aldrich, E.D. Nafziger, and R.R. Johnson. 2000. Modern corn and soybean production. MCSP Publications, Champaign, IL. Holshouser, D.L., and J.P. Whittaker. 2002. Plant population and row-spacing effects on early soybean production systems in the Mid-Atlantic USA. Agron. J. 94:603-611. Holshouser, D.L., and R.D. Taylor. 2008. Wheel traffic to narrow-row reproductive-stage soybean lowers yield. Crop Management. doi:10.1094/ CM-2008-0317-02-RS. Holshouser, D.L., R.D. Grisso, Jr., and R.M. Pitman. 2006. Uniform stand and narrow rows are needed for higher double-crop soybean yield. Crop Management. doi:10.1094/CM-2006-0417-01-RS. Hopkins, W.G. 1999. Introduction to plant physiology, 2 nd ed. John Wiley & Sons, New York. 163

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