No abstract

A study conducted in 1999&ndash;2000 in 6 compartments of the Chełmowa G&oacute;ra forest reserve, situated in the ŚwiętokrzyskieMountains, was aimed at harmful insects infesting cones and seeds of Larix decidua Mill. subsp. polonica (Racib.) Domin. Insect rearing and seed and cone cutting yielded 1,045 specimens of insects belonging to <br />8 species. Resseliella skuhravyorum Skrzypcz. (Diptera: Cecidomyiidae) and Megastigmus pictus (F&ouml;rster) (Hymeno-ptera: Torymidae) were the most abundantly represented species. They were present in cone samples of all investigated trees. The index of infestation of cones by insects (WZS) was higher in the case of trees growing at the forest edge. The analysis by cutting showed an insignificant percent increase &ndash; 6.7% of sound seeds while 88.9% of seeds were blind. M. pictus damaged 2.6% of larch seeds, while R. skuhravyorum 1.7%. The parasitoid Mesopolobus zetterstedtii (Dalla Tore) was received from the mass rearing where its host is M. pictus.

We prove that a player α has a winning strategy in the Banach-Mazur game on a space X if and only if X is F-Y countably π-domain representable. We show that Choquet complete spaces are F-Y countably domain representable. We give an example of a space, which is F-Y countably domain representable, but it is not F-Y π-domain representable.Date: ver.30.

A total of 14,537 individuals representing 22 insect species were obtained from 2204 cones of Abies alba Mill. The coenotic groups of insects have been given and the indexes of domination (D), stability of incidences (C), species diversity (d) and Agrell's index of species co‐existence (Ag) have been calculated. Investigations were conducted during 1987–1992 in 14 compartments of the St. Cross Mts. National Park in central Poland.