An aqueous composition suitable for applying insecticides or acaricides to plant propagation materials comprising water, an insecticidally or acaricidally effective amount of at least one nitroimino- or nitroguanidino-compound in free form or in agrochemically useful salt form and a blend of the following components, by weight: a) 2-10% of a surface-active agent comprising a1) at least one anionic surfactant; b) 4-20% of at least one inorganic solid carrier; and c) 3-25% of at least one antifreeze agent.In one embodiment, the aqueous composition further comprises a fungicidally effective amount of at least one fungicidally active compound.The inventive composition is storage stable, ready-to-apply (RTA), ecologically and toxicologically favorable and has good fungicidal efficacy.