A seed treatment aqueous insecticidal and/or nematicidal composition in theform of a suspension comprising: (A) at least one insecticide and/ornematicide in an amount of at least 3 weight %, based on the weight of thecomposition, and optionally at least one other substance which has a meltingpoint above 30~C； and (B) at least two surface active compounds, wherein (i)at least one surface active compound has a molecular weight of less than 2200and a Hydrophile-Lipophilic Balance (HLB) of at least 10 and (ii) at least onesurface active compound is non-ionic, has a molecular weight of at least 2200,wherein 10 to 60 % of the compound molecular weight contributes to thehydrophile constituent of the compound, and the molecular weight of thehydrophobe constituent of the compound is from 2000 to 10000； provided thatthe weight ratio of (B):(A) is in the range 0.08 to 0.5, and the weight ratioof (ii):(i) is at least 0.5. Such compositions demonstrate improved dust-offperformance when applied to propagation material, such as seeds.
