|Griffin, J. - LOUISIANA STATE UNIV.|
|Clay, P. - LOUISIANA STATE UNIV.|
|Grymes, C. - LOUISIANA STATE UNIV.|
Submitted to: Proceedings of Southern Weed Science Society
Publication Type: Abstract Only
Publication Acceptance Date: October 20, 1998
Publication Date: N/A
Technical Abstract: In 1995, Roundup plus Induce was applied with a hooded sprayer on October 20 to surgarcane. Bermudagrass ground cover was approximately 85%. Bermudagrass control within the treated area 43 DAT was 68, 80, and 91% for 1, 2, and 3 qts/A, respectively. On May 17 of the following year, bermudagrass coverage of the row top was 28, 24, and 11% for roundup at 1, 2, and 3 qts/A, respectively, compared with 71% for the nontreated check. In 1996, bermudagrass control was compared using a standard hood and one equipped with a Weedseeker Model 612 system which consisted of four sensors. Both hoods were attached to the same tool bar to allow for side-by-side comparisons. Use of the sensor-equipped hood resulted in 29 to 68% savings (experiment 1) and 5 to 27% savings (experiment 2) in Roundup volume sprayed compared with the standard hood. Bermudagrass control on the row tops and in the middles 24 DAT was excellent (98 to 100%) where both the standard and sensor-equipped hoods were used. No visual differences in sugarcane height or shoot population were observed between the treated and nontreated plots. In 1997, Roundup Ultra at 2 qt/A was applied using standard and sensor-equipped hoods on October 30 at three locations. Bermudagrass ground cover ranged from 15 to 60%. Use of the sensor-equipped hood resulted in an average savings of 17 to 30%. Bermudagrass control was at least 94% and sugarcane was not injured. Results indicate that Roundup application with a hooded sprayer can be an effective bermudgrass management tool. Use of a sensor-equipped hooded sprayer significantly reduced herbicide cost without sacrificing bermudagrass control. When Roundup was applied in October the rate required for bermuda grass control was less than when applied in April.