Leveillula taurica Powdery Mildew on Greenhouse Cucumbers in Libya. S. S. El-Ammari, Graduate Student, Department of Plant Protection, Faculty of Agriculture, Al-Fateh University, Tripoli, Libya. M. Wajid Khan, Associate Professor, Department of Plant Protection, Faculty of Agriculture, Al-Fateh University, Tripoli, Libya. Plant Dis. 67:553-555. Accepted for publication 9 December 1982. Copyright 1983 American Phytopathological Society. DOI: 10.1094/PD-67-553.

Leveillula taurica powdery mildew on cucumbers (Cucumis sativus) is reported for the first time in Libya. A survey of cucurbits in different regions of the country for powdery mildew during March through July 1981 showed the existence of L. taurica on cucumber in that country. Powdery mildew was causing serious damage to cucumbers in one greenhouse at El-Khoms in the western region and in another at Derna in the eastern region of the country. Plants were heavily infected and showed typical symptoms of powdery mildew caused by L. taurica. Morphological characteristics of the conidial state of the pathogen were those of L. taurica. This fungus perhaps should be considered potential causal organism of powdery mildew of cucurbits in addition to Sphaerotheca fuliginea and Erysiphe cichoracearum.