LEAFY SPURGE (EUPHORBIA-ESULA) CONTROL WITH QUINCLORAC

Quinclorac is a systemic herbicide registered to control annual grass and broadleaf weeds in rice. Field research was conducted to determine the most effective quinclorac treatment for leafy spurge control. Lea fy spurge control 12 mo after treatment (MAT) averaged 38 and 77% when quinclorac was applied at 0.56 and 1.7 kg ae/ha, respectively. Quincl orac applied with the crop-oil based adjuvant Scoil provided similar l eafy spurge control compared to quinclorac applied alone. Quinclorac p lus Scoil applied with picloram provided better leafy spurge control t han quinclorac plus Scoil alone. The optimum date for fall treatment w ith quinclorac is broad. Quinclorac at 1.1 kg/ha plus Scoil at 2.3 L/h a applied on September 1, September 15, October 1, and October 15 prov ided similar leafy spurge control and averaged 56% 12 MAT.