The present invention, (a) intensity at 340nm the xenon light of the cut-off 290nm 0.68W / m 2 in 8 hours and irradiated after the residual rate of 50% or more, and the pesticidal active ingredient 56 hours and irradiated after the residual ratio is 60% or less than 40%, (b) a hydrophobic organic solvent, (c) a water soluble polymer dispersing agent, and containing (d) water, the agrochemical active ingredient is emulsified into droplets of water continuous phase comprising been suspended or dissolved in hydrophobic organic solvent It becomes, and the weight ratio of the agrochemical active ingredient and the hydrophobic organic solvent is 5: 95 to 70: relates to an aqueous emulsion pesticidal composition is 30. The pesticidal composition of the present invention, it is possible to suppress light degradation of the pesticidally active ingredient.本発明は、(a)カットオフ290nmのキセノン光を340nmにおける強度0.68W/m2で8時間照射した後の残存率が50%以上、且つ56時間照射した後の残存率が40%以上60%以下である農薬活性成分、(b)疎水性有機溶媒、(c)水溶性高分子分散剤、及び(d)水を含有し、該農薬活性成分が該疎水性有機溶媒に懸濁または溶解されてなる液滴が水連続相に乳濁されてなり、且つ該農薬活性成分と該疎水性有機溶媒との重量比が5:95~70:30である水性乳濁状農薬組成物に関する。本発明の農薬組成物によって、農薬活性成分の光分解を抑制することができる。
