ABSTRACT
Clay loaded carboxymethylcellulose and plaster of Paris granules have been manufactured as substitutes of initially tested synthetic polymers as controlled release matrices for the repellent naphthalene. The formulations loaded with different percentages of active ingredient have been used in experiments in fields with cauliflower, attacked by the cabbage root fly, Delia radicum (brassicae). The results were compared with the effectivity of a conventional insecticide treatment.
