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| Treatment Threshold at 7-14 days past 1/2” internode elongation3 | |||||
| Rice Variety | Sheath Blight Reaction | Percent Positive Stops | Percent Infected Tillers | ||
| AB6565 | VS | 35 | 10-May | ||
| Clearfield (R) CL-121 | VS | 35 | 10-May | ||
| Clearfield (R) CL-141 | VS | 35 | 10-May | ||
| Clearfield CL-161 | VS | 35 | 10-May | ||
| Cocodrie | VS | 35 | 10-May | ||
| Cypress | VS | 35 | 10-May | ||
| Lemont | VS | 35 | 10-May | ||
| Madison | VS | 35 | 10-May | ||
| CL161 | VS | 35 | 10-May | ||
| AB 647 | MS | 50 | 15-Oct | ||
| AB1542 | MS | 50 | 15-Oct | ||
| AB6465 | MS | 50 | 15-Oct | ||
| Ahrent | MS | 50 | 15-Oct | ||
| Alan | MS | 50 | 15-Oct | ||
| Bengal | MS2 | 50 | 15-Oct | ||
| Drew | MS | 50 | 15-Oct | ||
| Earl | MS1 | 50 | 15-Oct | ||
| Francis | MS | 50 | 15-Oct | ||
| Jefferson | MS | 50 | 15-Oct | ||
| Kaybonnet | MS | 50 | 15-Oct | ||
| Koshihikari | MS1 | 50 | 15-Oct | ||
| LaGrue | MS | 50 | 15-Oct | ||
| Newbonnet | MS | 50 | 15-Oct | ||
| Priscilla | MS | 50 | 15-Oct | ||
| Saber | MS | 50 | 15-Oct | ||
| Wells | MS | 50 | 15-Oct | ||
| XL-6 Hybrid Rise | MS2 | See footnote3 | See footnote3 | ||
| XL-7 Hybrid Rice | MS | 50 | 15-Oct | ||
| XL-8 Hybrid Rice | MS | 50 | 15-Oct | ||
| 1These varieties rarely benefit from sheath blight fungicide applications. | |||||
| 2Under low nitrogen management, XL-6 should not need a fungicide application. | |||||
| 3Thresholds are based on adequate scouting. Each field should be scouting in a zigzag pattern avoiding the edges | |||||
| and ends of the field, stopping every 50 steps to inspect a 3 ft. long section of rice. If any symptoms are observed | |||||
| in the section, this is a positive stop. At least 50 stops per field should be made or 1 per acre in large fields. If | |||||
| sheath blight is concentrated in certain parts of the field, treat only the infected region if it exceeds the threshold. | |||||
| Field history should also be used to determine the need for a fungicide application. | |||||
| --Rick Cartwright and Fleet Lee, University of Arkansas | |||||
