Bentazone has low acute mammalian toxicity by oral (LD50=1,100 mg/kg, Toxicity Category III), dermal (LD50 > 2,500 mg/kg, Category III), and inhalation (LC50 > 5.1 mg/L, Category IV) exposures. It is moderately irritating to the eye (Category II) and slightly irritating to the skin (Category IV). Bentazone is a dermal sensitizer. It is practically nontoxic to nontarget insects (honeybee), LD50 > 100 ug/bee, and fish, LC50 > 100 ppm.

Plant injury can occur due to misapplication, spray tank contamination, or spray drift. Affected foliage will become yellow or bronze in color and eventually necrotic. Injury is confined to foliage that has come in contact with the herbicide since there is limited translocation within plants after absorption. Injury symptoms can look similar to those caused by cell membrane disrupters herbicides. Crop oil concentrate and other spray additives may increase weed control and crop injury symptoms.

Bentazone and Human Health

Besides the acute toxicity mentioned, Bentazone has not been shown to cause acute neurotoxicity, carcinogenicity, mutagenesis, or cytotoxicity. It is a skin sensitizer and causes eye irritation. Applicators and handlers are required to wear chemical protective clothing and eyeware.

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DiazinonBentazone is used as herbicide in wheat field
Bentazone has low acute mammalian toxicity by oral (LD50=1,100 mg/kg, Toxicity Category III), dermal (LD50 > 2,500 mg/kg, Category III), and inhalation (LC50 > 5.1 mg/L, Category IV) exposures. It is moderately irritating to the eye (Category II) and slightly irritating to the skin (Category IV). Bentazone is a...