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Journal of Biological Sciences

Year: 2002 | Volume: 2 | Issue: 6 | Page No.: 403-407
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Research Article

Control of Downy Mildew on Protected Cucumber Plants With Film Forming Antitranspirants

Wafaa M. Haggag

ABSTRACT

Downy mildew in cucumber plants, caused by Pseudoperonospora cubensis, was reduced by foliar spraying of antitranspirants film Kaolin nu-film, bio-film, folicote and Polyacrylamide Anti-Stress 550. In greenhouse test, antitranpirants proved to be effective treatments in reducing disease incidence, severity and pathogen sporulation when applied prior or post to inoculation. Among these compounds, Kaolin and Nu-Film (1.0 %) were more effective in reducing spores counts, germination and infection as well as downy infected area and lesions number. Scanning electron microscope examination showed that, Kaolin antitranspirant inhibited zoospores germination, growth and development as well as had become collapsed and lost its turgidity when applied either pre or post inoculation. Although, spraying of Bio-Film and Polyacrylamide Anti-Stress 550 antitranspirants, at 1 and 3%, resulted also in better disease control. Under protected cultivation and natural infection conditions, all antitranspirants showed a remarkable effectiveness on the reduction of disease severity and pathogen density when applied twice at 45 and 75 days after sowing in cucumber leaves. Furthermore, all tested antitranspirants, significantly increased the cucumber plant height and yield. Kaolin strongly protected cucumber against downy mildew and yield increased. Conclusively, antitranspirants film can be used as effective treatments for the control of downy mildew disease in cucumber plants under plastic houses.
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