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Bentazone is a post-emergence herbicide used for selective control of broadleaf weeds and sedges (a weed) in beans, rice, corn, peanuts, mint, and others. Bentazone is a contact herbicide, which means that it causes injury only to the parts of the plant to which it is applied. It interferes with the ability of susceptible plants to use sunlight for photosynthesis.
Bentazone is a selective contact herbicide, absorbed mainly by the foliage, with very little translocation, but also absorbed by the roots, with translocation acropetally in the xylem.
Bentazone is used as a contact herbicide controlling Anthemis, Chamomilla and Matricaria spp., Chrysanthemum segetum, Galium aparine, Lapsana communis and Stellaria media in winter and spring cereals at 1.0-2.0 kg a.i./ha.
Other crops include peanuts, maize, peas, Phaseolus beans, rice and soya beans.
Physical Chemistry:Pure Bentazon is a colorless to slightly brown, odorless crystalline solid.
Water Solubility: 500 mg/L @ 20 C.
Solubility in Other Solvents: acetone v.s.; ethanols, ethyl acetates, and benzene s.s.; cyclohexane s.s.
Melting Point: 137-139 C.
Vapor Pressure: Negligible; <0.46 mPa @ 20 C
The LD50 for bentazon in rats is 1100 to 2063 mg/kg . Its dermal LD50 is 4000 mg/kg in rabbits. When bentazon was applied to the shaven skin of rabbits, it did not cause irritation.

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