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Wyszukujesz frazę "acantholyda posticalis" wg kryterium: Temat

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    Tytuł:
    Ograniczanie liczebności osnui gwiaździstej Acantholyda posticalis Mats. w drzewostanach sosnowych
    Reducing the abundance of great pine web-spinning pine sawfly Acantholyda posticalis Mats. in pine stands
    Autorzy:
    Głowacka, B.
    Skrzecz, I.
    Bystrowski, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/991109.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    ochrona lasu
    drzewostany sosnowe
    szkodniki roslin
    osnuja gwiazdzista
    Acantholyda posticalis
    ograniczanie liczebnosci
    zwalczanie szkodnikow
    insektycydy
    acetamipryd
    Mospilan 20 SP
    skutecznosc dzialania
    acantholyda posticalis
    pinus sylvestris
    mospilan 20 sp
    Opis:
    The study aimed at the estimation of efficacy of the insecticide Mospilan 20 SP (active substance: acetamipryd 20%) used at different doses to reduce the number of great pine web−spinning pine sawfly Acantholyda posticalis Mats. in aerial (doses: 0.2, 0.3 and 0.4 kg/ha) and ground treatments (dose: 0.4 kg/ha). The mortality of A. posticalis larvae reached 57.5−71.6% in aerial treatments. However the insecticide used at the dose of 0.4 kg/ha in aerial and ground treatments caused 95−99% mortality of the pest.
    Źródło:
    Sylwan; 2014, 158, 05; 323-330
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rozmieszczenie zimujących stadiów przedimaginalnych osnui gwiaździstej Acantholyda posticalis Mats. w drzewostanach sosnowych będących ogniskami gradacyjnymi szkodnika
    Distribution of wintering pre-imaginal stages of the great web-spinning pine sawfly Acantholyda posticalis Mats. in Scots pine stands being the outbreak centres
    Autorzy:
    Sławski, M.
    Mokrzycki, T.
    Perliński, S.
    Rutkiewicz, A.
    Sławska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/980205.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewostany sosnowe
    szkodniki roslin
    osnuja gwiazdzista
    Acantholyda posticalis
    larwy zimujace
    eonimfy
    pronimfy
    rozmieszczenie przestrzenne
    autumn survey
    scots pine pests
    eonymphae
    pronymphae
    abundance
    distribution variability
    Opis:
    Acantholyda posticalis Mats. for over twenty years increases the extent of occurrence and causes defoliation of Scots pine stands. The population size is estimated annually based on the autumn surveys of phytophagous insects, but accuracy of these prognoses is far from satisfactory. The aim of the study was to describe the spatial distribution of pre−imaginal stages of A. posticalis wintering in the litter and soil to improve the methods of survey currently applied in Polish forestry. The research was carried out in four forest district located in different regions of Poland. In each forest stand three following zones were outlined: the belt of trees on the edge of the stand adjoining to young plantation or thicket, the belt 15−20 m from the stand edge and the belt in the forest interior at least 30−40 m from the edge of a stand. 152 trees were examined and 1540 plots of size 1×0.5 m were established under their canopy. The pre−imaginal stages were searched within each of these plots in the litter and soil to the depth of 20 cm. Later on they were divided into eonymphae and pronymphae, and counted. The significant differences in number of pre−imaginal stages of A. posticalis between studied forest stands in different forest districts were found. The spatial distribution of larvae wintering in the litter and soil was highly variable in scale of both stand and single tree. The abundance of larvae depended on the distance from the forest edge, but the values of this parameter calculated for trees in the same zone also varied substantially. The lowest mean abundance of pre−imaginal stages of A. posticalis denoted under pines growing at the edges of trees stand. Within the canopy projection on forest floor, the distribution of larvae was significantly dependent on the distance from the tree trunk. The highest abundance was observed within one meter from the trunk. The survey method currently used for primary pine pest assessment in Polish forests bases on ten plots and five of them are located 1.5 m from the tree trunk. In the light of presented results, the assessment of A. posticalis number could be inaccurate, because half of these plots in which scrutiny of litter and soil take place, omit the areas of higher concentration of wintering stages of the pest.
    Źródło:
    Sylwan; 2019, 163, 07; 556-563
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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