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Tolerance of Southern US Rice Cultivars to Benzobicyclon

  • Mason L. Young (a1), Jason K. Norsworthy (a1), Robert C. Scott (a1) and Lon T. Barber (a1)


Benzobicyclon is the first 4-hydroxyphenylpyruvate dioxygenase-inhibiting herbicide pursued for commercial registration in U.S. rice production. A study was conducted in 2015 and 2016 to evaluate the response of eight rice cultivars to post-flood application timings of benzobicyclon at 494 g ai ha-1 (proposed 2X rate). ‘Caffey’, ‘CL151’, ‘CLXL745’, ‘Jupiter’, ‘LaKast’, ‘Mermentau’, ‘Roy J’, and ‘XL753’ were evaluated in response to applications of benzobicyclon. The highest level of visible injury was observed in LaKast at 7% in 2015. No visible injury was detected among other cultivars either year at 2 weeks after treatment. In 2015 and 2016, no more than a four-day delay to reach 50% heading occurred across all cultivars. Rough rice yield was not affected by any of the post-flood application timings of benzobicyclon. A second study was conducted in 2016 at three locations throughout Arkansas to investigate the tolerance of 19 tropical japonica (inbred and hybrid) and two indica inbred cultivars to a premix containing benzobicyclon at 494 g ai ha-1 and halosulfuron at 72 g ai ha-1 applied 1 week after flooding. The tropical japonica cultivars have excellent crop safety to benzobicyclon while application to the indica cultivars, Rondo and Purple Marker, expressed severe phytotoxicity. Benzobicyclon caused less than a 2 d delay in heading to the japonica cultivars. Rough rice yield of the tropical japonica cultivars was not affected by benzobicyclon while yields of both indica cultivars were negatively affected. Benzobicyclon can safely be applied to drill-seeded tropical japonica inbred and hybrid cultivars in a post-flood application without concerns for crop injury. Benzobicyclon should not be used on indica cultivars as it will cause severe injury, delayed heading, and yield loss.


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Associate Editor for this paper: Jason Bond, Mississippi State University.



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Almsick, A (2009) New HPPD-inhibitors. A proven mode of action as a new hope to solve current weed problems. Outlooks Pest Manag 20:2730
Brazzle, JR, Alonso, DF, Holmes, KA, Takahashi, A (2014) Development of a novel herbicide, benzobicyclon, for California rice production. Page 100 in Proceedings of the 35th Rice Technical Working Group. New Orleans, Louisiana: Louisiana State University Agricultural Center
Bond, JA, Walker, TW (2012) Effect of postflood quinclorac applications on commercial rice cultivars. Weed Technol 26:183188
Bond, JA, Walker, TW, Webster, EP, Buehring, NW, Harrell, DL (2007) Rice cultivar response to penoxsulam. Weed Technol 21:961965
Burgos, NR, Norsworthy, JK, Scott, RC, Smith, KL (2008) Red rice (Oryza sativa) status after 5 years of imidazolinone-resistant rice technology in Arkansas. Weed Technol 22:200208
Burgos, NR, Singh, V, Tsend, TM, Black, H, Young, ND, Huang, Z, Hyma, KE, Gealy, DR, Caicedo, AL (2014) The impact of herbicide-resistant rice technology on phenotypic diversity and population structure of United States weedy rice. Plant Phys 166:12081220
Hardke, JT (2013a) Arkansas Rice Production Handbook. Arkansas Cooperative Extension Service Miscellaneous Publications 192. Little Rock, AR: University of Arkansas
Hardke, JT (2013b) Trends in Arkansas rice production. BR Wells Rice Res Stud AAES Res Ser 617:1323
Heap, I (2016) The International Survey of Herbicide Resistant Weeds. Accessed: December 1, 2016
Kato, H, Maeda, H, Sunohara, Y, Ando, I, Oshima, M, Kawata, M, Yoshida, H, Hirose, S, Kawagishi, M, Taniguchi, Y, Murata, K, Maeda, H, Yamada, Y, Sekino, K, Yamakazi, A, inventors; Toyama Prefecture, SDS Biotech K.K., Incorporated Administrative Agency National Agriculture and Food Research Organization, assignees. (2015) February 12. Plant having increased resistance or susceptibility to 4-HPPD inhibitor. US patent 0047066
Kim, SY, Oh, SH, Lee, JY, Yeo, US, Lee, JH, Cho, JH, Song, YC, Oh, MK, Han, SI, Seo, WD, Jang, KC, Na, JE, Park, ST, Nam, MH (2012) Differential sensitivity of rice cultivars to HPPD- inhibiting herbicides and their influences on rice yield. Korean J Crop Sci 57:160165
Komatsubara, K, Sekino, K, Yamada, Y, Koyanagi, H, Nakahara, S (2009) Discovery and development of a new herbicide, benzobicyclon. J Pestic Sci 34:113144
Kwon, OD, Shin, SH, An, KN, Lee, Y, Min, HK, Park, HG, Shin, HR, Jung, H, Kuk, YI (2012) Response of phytotoxicity on rice varieties to HPPD-inhibiting herbicides in paddy rice fields. Korean J Weed Sci 32:240255
Lancaster, ZD, Norsworthy, JK, Martin, SM, Young, ML, Scott, RC, Barber, LT (2015) Optimizing rate structure for sequential application in Provisia rice. BR Wells Rice Res Stud AAES Res Ser 634:180184
Mackill, DJ (1995) Classifying japonica rice cultivars with RAPD markers. Crop Sci 35:889894
McKnight, BM, Webster, EP, Fish, JC, Bergeron, EA, Sandoski, CA (2014) Potential for benzobicyclon under common Louisiana cropping systems. Pages 100–101 in Proceedings of the 35th Rice Technical Working Group. New Orleans, Louisiana: Louisiana State University Agricultural Center
Meier, JR (2012) Rice (Oryza sativa) Response to Low Glyphosate Rates As Influenced by Cultivar, Growth Stage, and Imazethapyr Applications. MS thesis. Fayetteville, AR: University of Arkansas. 217 p
Montgomery, GB, Bond, JA, Golden, BR, Gore, J, Edwards, HE, Eubank, TW, Walker, TW (2014) Response of commercial rice cultivars to postemergence applications of saflufenacil. Weed Technol 25:679684
Norsworthy, JK, Bond, J, Scott, RC (2013) Weed management practices and needs in Arkansas and Mississippi rice. Weed Technol 27:623630
Norsworthy, JK, Burgos, NR, Scott, RC, Smith, KL (2007) Consultant perspectives on weed management needs in Arkansas rice. Weed Technol 21:832839
Norsworthy, JK, Sandoski, CA, Scott, RC (2014) A review of benzobicyclon trails in Arkansas rice. Page 99–100 in Proceedings of the 35th Rice Technical Working Group. New Orleans, Louisiana: Louisiana State University Agricultural Center
Norsworthy, JK, Scott, RC, Johnson, DB (2012) A six-year summary of the herbicide-resistance weed screening program in rice at the University of Arkansas: 2006–2012. BR Wells Rice Res Stud AAES Res Ser 609:153158
Sandoski, CA, Brazzle, JR, Holmes, KA, Takahashi, A (2014) Benzobicyclon: a novel herbicide for U.S. rice production. Page 99 in Proceedings of the 35th Rice Technical Working Group. New Orleans, Louisiana: Louisiana State University Agricultural Center
Scott, RC, Norsworthy, JK, Barber, LT, Boyd, JW, Burgos, N, Selden, G (2016) Recommended Chemicals for Weed and Brush Control. Little Rock, AR: University of Arkansas System Division of Agriculture, Cooperative Extension Service MP442016. Pp 91107
Scott, RC, Norsworthy, JK, Burgos, NR, Rouse, C, Bagavathiannan, M (2016) Identification and control of problematic sedges in Arkansas rice. Fayetteville, AR: Crop Soil and Environmental Sciences Department at the University of Arkansas System Division of Agriculture FSA2173
Sekino, K, Koyanahi, H, Ikuta, E, Yamada, Y (2008) Herbicidal activity of new paddy bleaching herbicide, benzobicyclon. J Pestic Sci 33:364370
Street, JE, Snipes, CE (1987) Susceptibility of rice (Oryza sativa) to various postemergence grass herbicides. Weed Sci 35:686690
Sudianto, E, Beng-kah, S, Ting-Xiang, N, Saldain, NE, Scott, RC, Burgos, NR (2013) Clearfield rice: its development, success, and key challenges on a global perspective. Crop Prot 49:4051



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