New imidazopyridazine derivs. comprise 2-(diethoxyphosphoryloxy)-imidazo 1,2-b pyridzine (I) and 2- dimethoxythiophosphoryloxy)-imidazo 1,2-B pyridazine (II). Cpds. (I) and (II) are insecticides, e.g. active aainst Drosophila, melanogaster, Blattella germanica, Sitophilus granarius, Musca Domestica (adults and larvae) and Aphis fabae. In an example, (I) is prepd. by reacting 2-hydroxy-imidazo 1,2-b pyridazine with O, O-diethyl phosphorochloridate.
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