Fruit growing
and viticulture of South Russia

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�he results of study and development of root cancer eradication technology in the mother plantation of apple tree clonal rootstocks �re presented on the basis of own study and analysis of literary sources

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The data of efficiency of Vintsit Forte preparation against the fungus pathogens of diseases at storage of strawberries seedlings Frigo, and after transplanting of seeblings in the field is obtained. Stimulating action of preparation on growth of the strawberries plants is established

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The study of the changes in the characteristics of plant tolerance in the process of vegetative reproduction is of considerable interest for fruit crops propagated by bud grafting and other types of grafting and other methods, due to the large economic significance of viral infections. There are many plum varieties manifested the tolerance to infection of plum shark (PPV) virus. These varieties practically do not lose the yield and quality of the fruit in case of PPV infection. It is believed that tolerance can be determined by changes in plant metabolism caused by the penetration and multiplication of viruses. The purpose of this study is to gain the new knowledge about the tolerance of domestic plum-tree to viral infections in order to reveal the regularities of change in susceptibility of plum plants to virus of PPV. This paper presents the results of studying the tolerance of the plum domestic varieties to Sharkey's virus on the criterion �the manifestation of symptomatology� in the leaves of sapling. The urgency of study is determined by the high economic value of Sharkey's virus (PPV) at the cultivation of stone fruit crops. The presence or the absence of the symptomatology of virus infection is the sign of different receptivity of the plum varieties to the infection. The symptoms of contamination in a course of infection are not manifested in the steady varieties, they are manifested in the less steady varieties. As a result of study of the external infection manifestation (simptoms) and diagnostics of virus carrying by the method of PCR-analysis it is found that the part of vegetative posterity of the same varieties � PPV virus carriers have been appeared the signs of infection by Sharkey's plum virus in the form of specific annular patch effect, but the part of the sapling did not appear the infection signs, that also is the peculiarity of different receptivity in the vegetative generation (saplings). This means that the tolerance, as a plant property, is able to change in a course of vegetative reproduction.