Use of Preemergence Herbicides for Weed Control in Rye Grass Cover Crops between Watermelon Rows

Peter J Dittmar, Robert Hochmuth


The objective of this study was to determine the effectiveness of preemergence herbicides between watermelon [Citrullus lanatus(Thunb.) Matsum. and Nak.] rows for weed control in rye (Secale cerealeL.) cover crops between rows. Preemergence herbicides tank mixed with paraquat were fomesafen at 0.23 and 0.72 kg/ha, flumioxazin 0.07 and 0.14 kg/ha, S-metolachlor at 0.11 and 0.17 kg/ha, and terbacil at 0.11, 0.17, and 0.43 kg/ha. At 10 and 18 d after application (DAA), a preemergence herbicide tank mixed with paraquat increased wild radish (Raphanus raphanistrumL.) control (0% = no control, 100% = complete control) compared to control with application of paraquat alone. S-metolachlor at 0.11 kg/ha provided reduced wild radish control at 10 and 18 DAA (70% and 66%, respectively) compared to all other preemergence herbicide treatments (83% to 100% and 84% to 96%, respectively). No injury from the preemergence herbicides was observed. Volunteer iron clay pea [Vigna unguiculata(L.) Walpers] emerged at 18 DAA and no differences in iron clay pea control were observed among treatments. The use of a 30.5-cm-wide weed-free strip beside the planting bed will allow farmers to apply posttransplant herbicide treatments later or further away from the planting bed.


Citrullus lanatus, wild radish, Raphanus raphanistrum

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Proc. Fla. State Hort. Soc.     ISSN 0886-7283