Chemical control of rhododendron twig blight caused by Phytophthora Ramorum
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Research Institute of Pomology & Floriculture Pomologiczna 18, 96-100 Skierniewice, Poland
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Leszek B. Orlikowski
Research Institute of Pomology & Floriculture Pomologiczna 18, 96-100 Skierniewice, Poland
Journal of Plant Protection Research 2004;44(1):41-46
Biological activity of 6 fungicides in the inhibition of Phytophthora ramorum sporulation and development of blight on rhododendron leaves and stems were evaluated. All tested compounds at dose 8 μg o fa.i./cm3 already inhibited zoosporangia formation at least in 73%. On leaf petioles and leaf disks, taken from rhododendron one week after treatment with fungicides, formation of chlamydospores was especially suppressed by fenamidone + phosetyl Al and oxadixyl + mancozeb whereas development o fspores was not inhibited by cymoxanil + famoxate. All tested compounds significantly inhibited the development and spread of twig blight on rhododendron. However, furalaxyl, applied as spraying of plants 48 hrs before or after inoculation of leaves and stems by P. ramorum was the most effective
The authors have declared that no conflict of interests exist.
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