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Анотація

PATHOLOGICAL PROCESSES OF WITHERING PINE STANDS IN VOLYN POLISSYA

V. Borodavka, A. ?Getmanchuk, O. Kychylyuk, V. Voytyuk

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Abstract. The article presents the results of the plots inspection of withering pine stands in Volyn Polissya. It describes the most common regularities of current acute desiccation. Also, it diagnosing in the pine forests the spread of aggressive xylophages associations and ophiostamoid fungi causing rapid withering of forest stands. It was found that certain types of xylophages by its numbers, by the concentration in the lesions and by the intensity of the impact of harmful influence, reached the role and importance of primary pests. The increase of xylophages populations that serve as delivery agents of the complex ophiostamoid fungi, is accompanied by a simultaneous mass infection of stands with mycosis.

It was established that in the modern nomenclature of the current ophiostamoid pine fungi species, there are types which impressively manifested as plant pathogens and are beginning to develop on living trees immediately after the attacks of stem pests. With that, the xylophago-mycotic infection of pine dates back several cycles, while withering (extinction) of the main part of the damaged trees occurs throughout one growing season, intensifying in the second half. The trees infested or infected by pests and fungal infection in the late fall, are mostly dying at the start of the next growing season.

Numerous nature specifications proved of clear confinement of mycosis infection in place of the immigration of xylophages. Already at the initial stage the plot of the mycotic withering of bast fabrics increases rapidly, and after a month the area of pests resettlement increases several times.

The damage occurs mainly on the apical type. There are also butt and combined variations that ophiostamoid fungi entered by the specialized kinds of stem pests in the lower and middle part of the trunk. It was concluded that coniferous mycosis due to association with stem pests moved from the end to the initial stages of pathological processes, significantly speeding them.

Keywords: xylophages, ophiostamoid fungi, pathological processes of forest, sanitation forest conditions, common pine (Scots), coniferous mycosis.