A seed treatment aqueous insecticidal and/or nematicidal composition in the form of a suspension comprising: (A) at least one insecticide and/or nematicide in an amount of at least 3 weight %, based on the weight of the composition, and optionally at least one other substance which has a melting point a bove 30℃；and (B) at least two surface active compounds, wherein (i) at least one surface active compound has a molecular weight of less than 2200 and a Hydrophile－Lipophilic Balance (HLB) of at least 10 and (ii) at least one surface active compound is non－ionic, has a molecular weight of at least 2200, wherein 10 to 60% of the compound molecular weight contributes to the hydrophile constituent of the compound, and the molecular weight of the hydrophobe constituent of the compound is from 2000 to 10000；provided that the weight ratio of (B):(A) is in the range 0.08 to 0.5, and the weight ratio of (ii):(i) is at least 0.5. Such compositions demonstrate improved dust－off performance when applied to propagation material, such as seeds.本發明係關於一種呈懸浮液形式之水性種子處理殺蟲及/或殺線蟲組合物，其包含：；(A)至少一種殺蟲劑及/或殺線蟲劑，含量為以該組合物之重量計至少3重量%，及視情況選用之至少一種熔點高於30℃之其他物質；及；(B)至少兩種表面活性化合物，其中(i)至少一種表面活性化合物的分子量係小於2200且親水親脂平衡(HLB)至少為10及(ii)至少一種表面活性化合物是非離子性的並具有至少2200之分子量，其中10至60%之化合物分子量係貢獻給該化合物之親水組成分，而該化合物之疏水組成分的分子量係從2000至10000；；其條件為(B)：(A)之重量比係在0.08至0.5之範圍內，而且(ii)：(i)之重量比至少為0.5。當該等組合物應用在繁殖物質(如種子)時，證明可提供較佳除塵效果。
