Disclosed herein are acylhydrazone and semicarbazones derivatives of aldehydes and ketones that may act to at¬tract plant pathogenic zoospores and methods of using these compounds. These compounds include the compound according to Formula 1: wherein: X is selected from the group consisting of: (CH2)n, 1,3-phenylene and 1,4-phenylene Rl is selected from the group consisting of iso-butyl, sec -butyl and tert-butyl- CH2 R2 is hydrogen or methyl and n is equal to 0-25. Upon exposure to water, these compounds release aldehydes or ketones mat may attract zoospores. These compounds can be combined with fungi¬cides to form fungicidal formulations mat are especially effective against oomycete producing fungal pathogens.
