Pesticide compositions and pesticidal preparation

A particulate composition of matter capable of destroying an insect upon entering the insect body, the particles of said composition comprising substances that function to destroy an insect upon entering the insect body, wherein said substances comprise a first active substance, a second active substance and a bubble stabilizing agent, said first active substance and said second active substances being chosen such that contact of said first active substance with said second active substance in an aqueous environment causes a reaction that generates at least one gaseous product, with or without heat generation, and said bubble stabilizing agent being chosen such that the bubbles of gaseous product formed in the aqueous environment are stabilized, and wherein each of the substances that function to destroy an insect upon entering the insect body are non-toxic.