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Purple nutsedge  (Cyperus rotundus)  has become increasingly widespread in vegetable crops planted from August to October in the low deserts. A herbicide that is both effective and safe to crops has not yet been found. Several tests were conducted in southwestern Arizona to evaluate the efficacy of EPTC combined with summer fallow for the control of purple nutsedge. Preirrigation applications of the emulsifiable concentrate and granular formulation of EPTC were ineffective. These same treatments, applied after irrigation, when the top 6 inches of soil were dry, were very effective (75% to 90%) in controlling the emergence of purple nutsedge shoots. These tests demonstrated the importance of proper application and cultural practices when using this treatment before planting fall vegetables.

PURPLE NUTSEDGE CONTROL IN FALL VEGETABLES WITH EPTC AND SUMMER FALLOW