THE INCIDENCE OF DIPLOCARPON ROSAE ON ROSA CANINA SHRUBS ON SOUTH WESTERN PART OF ROMANIA. PUBLISHED

Ciui(Mot) Cerasela, Borcean Adrian adrian_borcean@yahoo.com
Rosa canina well known as dog rose grow on reference area as a shrub which populate the all areas within the open space valleys of the hilly and mountain regions. Plants prefer sunny places within meadow areas with medium and fertile soils but never the less it is known to be a good competitor for other plants like blackberry on the lower altitude places where the trees where cleared. It could be very easy considered from this point of view as an invasive weed. One of the dog rose major pathogen is fungus Diplocarpon rosae f.c. Marssonina rosae because of the black spots formed on the leaves which can’t be confused or missed during the plant diseases screening. This pathogen attack symptoms start to show on the early days of June and persist until the leaves are falling in the end of autumn. It is obvious that the leaves affected by pathogen are dry soon because and the plant shrub will show an acute leaf loose starting from the middle of August. Also as a second effect, the pathogen affect the green plant shoots by producing black spots. On the area of this black spots on the young green cane, the cuticle is broken and show deep lesions. During the winter inside this lesions the water will freeze and the affected shoots will be found dry on the next spring. The disease is spread by wind and insects and affects also the ornamental roses. It is easy to see that because of such a wide distributed host as dog rose, this pathogen will have no problem at all to survive and produce important damages to any rose flower culture on the area. This is one of the reasons why the people which take care about some roses will have to pay attention during entire vegetation period to the pathogen Marssonina rosae.
Diplocarpon rosae, Rosa canina,
Biology applied in Agriculture
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