Pests and grapevine diseases in organic production are suppressed by preventive measures with a view to reducing the impact of the attack. Allowed substances acting on patogenous fungi, insects, mites and other harmful organisms are used, if appropriate. Insecticides of plant origin are used in the organic production of grapevine, as well as vegetable oils, powders and insecticidal soaps that are selective, with a narrow range of effects and of lower toxicity, as well as biological products. As a rule, such plant protection products require a more frequent application.

In four interspecies crossing combinations of grapevine (Seedling 108 x Muscat Hamburg, Muscat Hamburg x Seedling 108, S.V.I8315 x Muscat Hamburg and Muscat Hamburg x S.V.I2375) during three years period, resistance to important fungal diseases agents (Plasmopara viticola and Botrytis cinerea) were examined. Based on results of analysis of variance, for investigated characteristics, components of variance, coefficients of genetic and phenotypic variation and coefficient of heritability in a broader sense were calculated.

The purpose of the research is the examination of the climatic characteristics, indexes and coefficients in the Ohrid area of vineyards. In the region under study the average annual air temperature was 11.5ºC, and the vegetative air temperature had a value of 16.7ºC. The annual temperature sum was 4198ºC, and ranged from 4033ºC to 4524ºC. The vegetative sum had a value of 3570ºC, and it ranged from 3326ºC to 3754ºC. The annual rain sum was 665 mm, and ranged from 483 mm to 927 mm.