Naptalam

Trade name(s) Alanap-L

Manufacturer(s) Chemtura

Formulation(s) 2 lb/gal soluble concentrate

Remarks A selective, preemergence, phthalic acid herbicide. A nonvolatile chemical activated by moisture, it usually does not last more than 6 to 8 wk in soil.

Water solubility Acid 200 ppm; sodium salt 230,800 ppm

Storage conditions Store below 140°F or it will precipitate. Crystals will form at freezing but will redissolve with agitation at warmer temperatures.

Acute toxicity LD50 - 1,770 mg/kg

Action in plant Inhibits transport of auxins; causes negative geotropism.

Site of action Group 19: inhibits indole acetic acid transport

Chemical family Phthalamate

Koc Average is 20 mL/g (estimated) at pH 7