Submitted to: Weed Science Society of America Meeting Abstracts
Publication Type: Proceedings
Publication Acceptance Date: May 10, 2000
Publication Date: N/A
Technical Abstract: Growth chamber experiments were conducted to investigate the effect of ambient temperature on the response of cole crops (broccoli and collard) to oxyfluorfen. Cole crops grown at cool temperatures (15/10 C) were more susceptible to preemergence or postemergence application of oxyfluorfen than those grown at warm temperatures (25/20 C) as quantified by injury ratings or shoot weight reduction. Differences between the response of susceptible and tolerant cultivars to preemergence oxyfluorfen application were greater at warm temperatures than at cool temperatures. However, the temperature effect on differential tolerance between cultivars was not as marked with postemergence application. Comparison of the leaf wax contents of cultivars included in this study indicated that while the cultivars varied in leaf wax content and tolerance to postemergence oxyfluorfen application, their relative tolerance to oxyfluorfen in the growth chamber was not always closely linked to leaf wax content. The results of this study indicate that varietal differences and ambient temperature may contribute to the inconsistency observed in the response of cole crops to oxyfluorfen.