SELECTIVITY AMONG CABBAGE (BRASSICA-OLERACEA L) CULTIVARS BY CLOMAZONE

Excellent agreement between a two-year replicated study relative to ch lorosis development by clomazone in thirty-six cabbage cultivars and d evelopment of chlorosis in a production field was obtained. The cultiv ars 'Bravo', 'Cheers', and 'Genesis' developed the most severe chloros is symptoms and 'Bently', 'Carlton', 'Cecile', 'Gourmet', 'King Cole', 'Ocala', 'Red Acre', 'Rio Verde', 'Roundup', 'Sombrero', 'Stonehead', 'Straton', 'Titanic', and 'Tristar' the least chlorosis. During a dry soil period chlorosis symptoms were more pronounced. Yield reduction at an application rate exceeding the suggested use rate for weed contr ol varied positively with level of chlorosis in 1992 for the cultivars Bravo, Cheers, Genesis, 'Krautman', and 'Marvelon'.