DISTRIBUTION AND DEVELOPMENT OF BLACK LEAF SPOT OF ROSES (DIPLOCARPON ROSAE F. A. WOLF) IN CONDITIONS OF URBAN ECOSYSTEMS AND CONTROL MEASURES

A.B. Marchenko

Abstract


Phytopathological monitoring of agrobiocenosis of roses in conditions of urban ecosystems of forest steppe of Ukraine was conducted during the 2008-2016 in garden and park objects limited and common use of large, medium and small cities in forest steppe of Ukraine and in private nurseries in Kiev area by route inspection according to generally accepted methods in phytopathology. Average annual spread of black leaf spot of roses D. rose F. A. Wolf is 46.9±18.5 %. The development of black leaf spot of roses occurred at the average daily air temperature 19.4±3.9 °C, amount of precipitation – 15.8±19.4 mm RH (relative humidity of air) – 66±19 %, HTC (hydrothermal coeficient) – 1.4±2.0. Appearing of the first signs of the manifestation of black leaf spot of roses in conditions of urban ecosystems ranged from the third decade of April to the third decade of May, against the background of multi-year of the following climatops indicators: the average temperature is 17.3±0.7 °C; precipitation 13.1±6.7 mm; RH – 58.2±1.8 %; HTK – 1.15±0.6. Periods of mass manifestation of pathology – from the first decade of July to the first decade of September, against the background of multi-year of climatope indicators: the average daily temperature is 21.25±4.5 °C; precipitation – 35.4±2.4 mm; RH – 71±8 %; HTK – 2.8±1.6. As a result of the immunological estimates of aggregate sample collection of genus Rosa L., by lesions of D. rosae F. A. Wolf in conditions of a natural background iss rewealed that varietes of samples is distributed by manifestation of stability to the: immune (R) – 22.1 %, practically resistant (R+) – 47.1 %, medium-resistant (S/) – 29.4 %, highly susceptible (S+) – 1.4 %. While the distribution in groups is as follows: Hybrid Tea roses are divided into immune (R) – 17.7 %, practically resistant (R+) – 26.5 %, medium resistant (S/) – 13.3 %; climbing – (R) – 2.9 %, (R+) – 16.2 %, (S/) – 10.2 %, (S+) – 1.5 %; English – (R) – 1.5 %, (R+) – 2.9 %, (S/) – 2.9 %; floribunda – (R+) – 1.5 %, (S/) – 2.9 %, to the total number of investigated varieties of samples. For selection as a source of polygenic resistant and for agroecology, as a factor in the selection of highly virulent pathotypes of the fungus D. rosae F.A. Wolf uses varieties of a group of Hybrid Tea roses. The effectiveness of biologics 56.4±16.3 % in the range of 21.1 to 72.3 %, while the highest indices of the protective action against the black spot of the leaves of the roses were: Trichopsin – 72.8 %, Tryhodermin BT+Planryz BT (1:1) and Tryhodermin BT+Haupsyn BT (1:1) 72.3 %, Planryz BT – 65.3 %.

Keywords


Rosa L.; Diplocarpon rosae F. A. Wolf; polygenic resistance; biotic factors; efficiency; biologicals

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References


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DOI: https://doi.org/10.15421/40270413

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