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The Annosum root rot (Heterobasidionannosum) is one of the most economically significant of the pathogens of pine plantings of the Central Russian forest-steppe and one Florida. The considerable package of measures on protection of a pine against Annosum root rot is so far recommended. But the problem remains as the recommended protective measures do not meet ecological, economic or social requirements, or they are insufficiently effective. The purpose of this work consists in the radical increase of efficiency of preventive pine protection against Annosum root rot on the basis of formation of plantings, adverse for development and distribution of the pathogen. The most intensive work in the Central Russian forest-steppe began in about 2001, Естественные науки и лес  Лесотехнический журнал 2/2017 7 in Florida the researches in this field were carried out permanently. The methods of phytopathologic survey and methods of laboratory mycologic researches were standard. Research conditions were high-heterogeneous landscapes. As a result of researches it is established that splitting a pathogen population into the rather small reproductive isolated subpopulations suppresses pathogen population. The essence of this phenomenon is that within subpopulations the probability of pairing of genetically close individuals during change of generation inevitably increases. It causes the increase of homozygosity in the pathogen posterities. Decrease in level of a genetic variety worsens fitness of a pathogen. The fitness characterizes ability of a survival and reproduction of population. The pathogen population splitting on subpopulation is reached by means of mosaic structure formation. It is empirically established (on the basis of multiple forest cultures of 1936 and later decades in the Central Russian forest-steppe), that ecologically isolated pine sites on the patches of 0,25 ha are adverse for a development and distribution of the pathogen and can be an effective factor of preventive protection of pine plantings against H. annosum. Group placement of the selection improved trees strengthens effect of an inbridingovy depression in pathogen subpopulations.

lesotehničeskij žurnal

Annosum root rot (heterobasidion annosum (fr.) Bref.) in the pine plantings of the Central Russian forest-steppe and Florida – the features of control of the pathogen