Leś. Pr. Bad., 2008, 1: 7-14.

Wzrost naturalnych odnowień sosny zwyczajnej i stan ich mikoryz
po chemicznej ochronie przed osutką
Growth and mycorrhiza condition of Scots pine natural regeneration
after chemical treatment against needle cast

Marta Aleksandrowicz-Trzcińska
Szkoła Główna Gospodarstwa Wiejskiego, Wydział Leśny, Katedra Ochrony Lasu i Ekologii, ul. Nowoursynowska 159, 02-776 Warszawa; fax: 022 59 38 171; e-mail: marta_aleksandrowicz_trzcinska@sggw.pl

Abstract. Effectiveness and influence of two fungicides: Falcon 460 EC and Gwarant 500 SC on the growth and mycorrhiza condition of Scots pine natural regeneration was investigated. Treatments were done according to the recommended doses, once or twice during two successive vegetation seasons to protect natural regeneration against pine needle cast caused by Lophodermium seditosum. On the permanent plots representing different location in respect to the mother stand the density of seedlings and the degree of needle cast infection were evaluated, seedlings’ height was measured, roots were collected and the share of their autotrophic and mycorrhiza tips counted. Performing one or two Falcon or Gwarant treatments during vegetation season might be insufficient to fully prevent regeneration from needle cast, especially in the case of more severe disease endangerment. Falcon was more effective in comparison with Gwarant. None of the tested fungicides limited mycorrhiza formation nor influenced the growth of regeneration.

Key words: ectomycorrhiza, fungicides, natural regeneration, needle cast of pine, Scots pine.