The present invention has an excellent control effect against plant diseases, the formula (1) wherein X1 represents a halogen atom or the like, and X2 represents a C1-C3 alkyl group or the like. And a tetrazolinone compound represented by formula (2): wherein R1 represents a C1-C6 alkyl group, R2 represents a hydrogen atom or the like, A represents a nitrogen atom or the like, and Y1 represents a halogen atom And n represents 0 or 1. The plant disease control composition containing the azole compound represented by the above formula, and the effective amount of the tetrazolinone compound represented by the formula (1) and the azole compound represented by the formula (2) are cultivated in plants or plants. Provided is a method for controlling plant diseases comprising a step of treating soil.本発明は、植物病害に対する優れた防除効力を有する、式(1)〔式中、X1は、ハロゲン原子等を表し、そしてX2は、C1~C3アルキル基等を表す。〕で示されるテトラゾリノン化合物と、式(2)〔式中、R1は、C1~C6アルキル基を表し、R2は、水素原子等を表し、Aは、窒素原子等を表し、Y1は、ハロゲン原子を表し、そしてnは0または1を表す。〕で示されるアゾール化合物とを含有する植物病害防除組成物、及び前記式(1)で示されるテトラゾリノン化合物と、前記式(2)で示されるアゾール化合物との有効量を植物または植物を栽培する土壌に処理する工程を含む植物病害防除方法を提供する。