Controlled release formulations of pesticides based on starch

New pesticide controlled release formulations based on starch were prepared by injecting a starch-clay-linseed oil slurry containing the herbicide tri flusulfuron-methyl in a calcium chloride solution. The formulations are sph erical in shape with a mean diameter of 0.19 cm and are resistant in water during three months. Pesticide release was evaluated in aqueous medium Comp lex two phase release kinetics is observed. Mobility was tested in packed s oil columns; residue analysis in leachates and in soil sections were perfor med by HPLC and on the basis of a bioassay using lentil plant. The new form ulations gave considerably slower release and reduced soil mobility in comp arison with conventional formulations.