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Introduction

  • Propanil is a selective post-emergent use herbicide registered to control broadleaf and grass weeds on rice. It is also registered (but not currently marketed) for turf use at commercial sod farms.

  • The small grain use was voluntarily cancelled.

  • On June 5, 2002, EPA published its tolerance reassessment decision on propanil in the Federal Register and released the human health and ecological risk assessments for public comment.

  • Propanil is considered neither carcinogenic nor mutagenic.

  • The risk to occupational handlers of propanil is potentially of concern for several of the aerial exposure scenarios, even with maximum personal protective equipment (PPE) and engineering controls.

  • To reduce these risks initially, the following mitigation measures are needed: (1) Spray drift management practices consistent with best management practices for rice; (2) Require engineering controls including closed cabs and closed mixing/loading systems; and (3) Maintain a reentry interval of 24 hours for rice.

Uses

  • Propanil is used alone and in combination with bensulfuron, carfentrazone, molinate, pendimethalin, quinclorac, thiobencarb and triclopyr.

  • Propanil is used on rice, primarily in California and the midsouthern states (Arkansas, Louisiana, Mississippi, Missouri and
    Texas).

  • Propanil is also registered (but not currently marketed) for turf use at commercial sod farms

  • There are no existing or proposed residential uses of propanil products.

Report

  • The detection of aryl acylamidase from the propanilresistant barnyardgrass was facilitated using a dichloroaniline coupling agent that provided greater sensitivity than that using the diazotization method (Bratton & Marshall 1939).

  • There were 431 presentations with a history of acute propanil poisoning over five years (5th April 2002 to 13th April 2007). Of these patients, 40 had ingested at least one other poison (30 of these were poisoned by a combination product containing propanil and another agent, usually clomazone, fentrazamide, pendimethalin or thiobencarb) and 3 of these died.

  • Patients with co-ingestions were not considered further.

 

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