Hydroximic acid derivatives have the formula (I), in which the substituents have the following meanings: X stands for CH, CHO or NO; Y stands for O or NH; Z stands for O, S or NR ; R stands for hydrogen, alkyl, alkenyl or alkinyl; R stands for hydrogen, alkyl or halogen alkyl; R stands for optionally substituted alkyl, alkenyl, alkinyl or cycloalkyl; R stands for optionally substituted alkyl, alkenyl or alkinyl. Also disclosed are a process for preparing these compounds and agents containing the same for controlling animal pests and harmful fungi.