Efficacy of Clomazone with Disulfoton and Aldicarb

M. C. Smith, R. D. Bagwell, N. P. Tugwell, and R. E. Frans


Clomazone tank-mixed with fluometuron has been shown to provide excellent control of many annual grass and broadleaf weeds in cotton. Excessive cotton injury is probable when clomazone is applied without an in-furrow organophosphate insecticide.

A plant response experiment comparing four treatments in 1992 and five treatments in 1993 was conducted at the Cotton Branch Experiment Station in Marianna, Arkansas. The treatments were disulfoton 0.84 kg/ha, disulfoton 0.56 + aldicarb 0.56, disulfoton 0.27 + aldicarb 0.56, aldicarb 0.56 (1993 only) in-furrow insecticide applications in combination with fluometuron 1.7 + clomazone 0.84 (PRE). The standard treatment for comparison in 1992 and 1993 was aldicarb 0.56 with trifluralin 0.84 + norflurazon 0.84 (PPI) followed by fluometuron 1.7 (PRE).

Plant growth and development were not effected by herbicide or in-furrow insecticide application in 1992. No treatment resulted in crop injury either year.In 1993, cotton treated with in-furrow applications of either aldicarb or aldicarb + disulfoton matured slightly earlier than cotton treated with a full rate of disulfoton. Yields were equal for all plots in the plant response experiments in 1992 and 1993.

A weed control experiment was conducted in 1993 at the Cotton Branch Experiment Station at Marianna, Arkansas comparing trifluralin 0.84 kg/ha (PPI) followed by fluometuron 1.34 (PRE), fluometuron 1.34 + clomazone 1.1 (PRE), clomazone 1.1 (PRE) with either aldicarb 0.56 or disulfoton 0.84 in-furrow. The standard treatment for weed control comparison was aldicarb 0.56 with trifluralin 0.84 + norflurazon 0.84 (PPI) followed by fluometuron 1.34 (PRE).

Clomazone tank-mixed with fluometuron decreased cotton injury, compared to clomazone alone, when applied in combination with aldicarb in-furrow, but both of these treatments resulted in excessive cotton injury 3 WAT. Treatments containing disulfoton in-furrow resulted in no cotton injury.

Weed control with clomazone plus fluometuron was equal to weed control with trifluralin + norflurazon followed by fluometuron regardless of soil insecticide. Control of pitted morningglory and entireleaf morningglory with clomazone was slightly less when disulfoton was used as the soil insecticide as compared to clomazone in combination with aldicarb.

Fluometuron + clomazone and clomazone alone in combination with aldicarb reduced cotton stands when compared to the standard treatment. Yields were equal for all treatments regardless of early season herbicide injury or stand reduction.

Reprinted from Proceedings of the 1994 Beltwide Cotton Conferences pp. 1685 - 1688
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998