RESEARCHES REGARDING THE INTRODUCTION OF ANTHRACNOSE-RESISTANT VARIETIES IN CHERRY TREE (COCCOMYCES HIEMALIS SIN BLUMERIA JAAPI) IN THE ORCHARD CENTRE LUGOJ HERINDEŞTI PUBLISHEDSnejana Damianov, Gheorghe Simeria, Ioana Grozea, Ramona Ştef, Ana Maria Vîrteiu
The pathogen Coccomyces hiemalis Higg. causes big losses in nursery gardens, generating massive defoliations. The fungus causing this disease produces infections in the spring, during flowering and during petal falling, by generating a mycelium that has several infection cycles in the vegetation stage, with 7-9-day incubation period, if the mean temperature is 17.6-21.8°C. The leaves attacked fade under conditions of premature defoliation and shoots and twigs die down, at the beginning of autumn. To determine the attack caused by Coccomyces hiemalis Higg. that produces cherry tree anthracnose, the main disease affecting this tree species, we carried out observations on a number of 8 cherry tree varieties and determined attack’s risk degree, frequency and intensity during the maximal attack period. We have done research on the influence of varieties, shapes and distance crown planting trees on the main diseases and pests attack. The fungus forms completed in the conditions of the area, with a high degree of sporulare being pretentious to temperature (biological threshold 10 ° C)and humidity. Terms of disease evolution were fired since April when he made ascosporilor design. Varieties’ resistance was determined according to the results obtained; then we determined the warning and the application of phyto-sanitary treatments. From the viewpoint of the attack caused by Coccomyces hiemalis Higg., in the South-West of the country, we grouped the cherry tree varieties as follows: slightly attacked (SA: Seneca, Cerna, Ulster); medium attacked (MA: Timpurii de Mai, Rosii de Bistrita); strongly attacked (PA: Van, Bing, Germesdorf). To reduce the environmental pollution occurred during the chemical control of this disease, we recommend the introduction of slightly- and medium- attacked varieties in cherry tree orchards. Compared with the number of 8 phyto-sanitary treatments warned, we applied only 4 treatments, in the slightly attacked varieties: Seneca, Cerna, Ulster; this represents a 50% reduction of treatments and environmental pollution.
anthracnose, cherry tree, variety, attack degree, resistance