61. Estimating the most effective and economical pheromone for monitoring the European spruce bark beetleNina Šramel, Andreja Kavčič, Marija Kolšek, Maarten De Groot, 2021, original scientific article Abstract: In recent decades, there have been an increasing number of outbreaks of Ips typographus in Europe. A large amount of sanitary felling has taken place, with significant economic and ecological consequences. In order to anticipate such large%scale outbreaks, an effective monitoring system should be set up. One important aspect of monitoring is deciding which pheromone to use. Therefore, we decided to test five different commercially available pheromone lures under different disturbance conditions: Pheroprax%, IT Ecolure Extra%, Ipstyp%, Ipsowit% and Typosan%. We investigated the ability of the pheromones to distinguish between disturbed and undisturbed locations, their cost%efficiency ratio, and side effects such as bycatch abundance and composition. We set 50 traps in two areas with sites that were disturbed and undisturbed by windstorms. We collected the catch from traps every 1%2 weeks from the end of March until the end of September in 2019. We found that IT Ecolure Extra%, Ipsowit% and % Pheroprax% caught the most I. typographus and best showed changes in the trap catch of I. typographus throughout the whole season. There was a low amount of bycatch (<6% of the total catch) and a low number of predators (a few specimens), but some groups seem to prefer certain pheromones. The cost of the pheromones increased with their effectiveness. However, pheromone costs are low relative to the personnel costs involved in setting traps and collecting the catch. Based on all of the gathered data, we created an index which helps to assess the cost%efficiency of the five chosen commercially available pheromones. We also present guidelines on how to make such an index to assist other researchers in choosing the right pheromone for monitoring populations of I. typographus or other bark beetle species. Keywords: bark beetles, cost-efficiency, Ips typographus, monitoring pheromones, Picea abies Published in DiRROS: 21.01.2021; Views: 1380; Downloads: 746 Full text (1,21 MB) This document has many files! More... |
62. The effect of crown social class on bark thickness and sapwood moisture content in Norway spruceLuka Krajnc, Jožica Gričar, 2020, original scientific article Abstract: The research study examined the effect of tree properties (crown social class, diameter at breast height (DBH), and tree height) on bark thickness (BT) and sapwood moisture content (SMC) in Norway spruce (Picea abies (L.) H. Karst.). Both examined variables were shown to be positively affected by DBH and tree height. The relationship between DBH and SMC varied among crown social classes, while the relationship between DBH and BT was relatively constant across crown social classes. Crown social class had a relatively small effect on BT and SMC, having a more pronounced effect on SMC than on BT. The relationship between tree height and BT did not vary across crown social classes, while the relationship between SMC and tree height was found to change slightly across crown social classes. Measurements of BT and SMC in the field are affordable, fast, and easy to use. Both variables could potentially be used to improve predictions of bark beetle attacks, as they reflect the physiological state of an individual tree. Keywords: Picea abies, tree diameter, tree height, crown social class, phloem, sapwood Published in DiRROS: 14.01.2021; Views: 1192; Downloads: 1020 Full text (968,46 KB) This document has many files! More... |
63. Preverjanje kratkoročnih napovedi sanitarnega poseka smreke in jelke zaradi podlubnikov v Sloveniji v 2020Nikica Ogris, Maarten De Groot, 2020, short scientific article Keywords: navadna smreka, Picea abies, bela jelka, Abies alba, sanitarni posek, napovedi, ogroženost, modeli, validacija, zmogljivost, zanesljivost, točnost, natančnost, AUC, občutljivost, specifičnost Published in DiRROS: 14.01.2021; Views: 1037; Downloads: 1085 Full text (1,66 MB) This document has many files! More... |
64. Predlogi postopkov za določitev optimalnega števila in lokacij kontrolnih pasti, kontrolnih nastav in lovnih nastav za osmerozobega smrekovega lubadarja (Ips typographus)Nikica Ogris, Marija Kolšek, Maarten De Groot, 2020, short scientific article Keywords: kontrolna past, kontrolna nastava, lovna nastava, optimizacija, protokol, osmerozobi smrekov lubadar, Ips typographus, smreka, Picea abies, spremljanje, monitoring Published in DiRROS: 14.01.2021; Views: 1029; Downloads: 742 Full text (251,60 KB) This document has many files! More... |
65. Pregled jelovih rastišč v SlovenijiIgor Dakskobler, Aleksander Marinšek, 2009, review article Abstract: Članek vsebuje pregled jelovih rastišč na ozemlju Slovenije. Našteli in kratko opisali smo deset jelovih (bukovo-jelovih, smrekovo-jelovih) združb. Nekatere uspevajo na svežih do vlažnih, nevtrofilnih ali acidofilnih rastiščih podgorskega in gorskega pasu (Galio-Abietetum, Bazzanio-Abietetum, Polysticho setiferi-Abietetum), druge na zelo skalnatih karbonatnih ali silikatnih rastiščih z inicialnimi tlemi (npr. Ribeso alpini-Piceetum, Neckero-Abietetum, Calamagrostio-Abietetum, Paraleucobryo-Abietetum). Jelka ima pomembno ekološko, biotopsko in gospodarsko vlogo v nekaterih bukovih (jelovo-bukovih) združbah (npr. Omphalodo-Fagetum, Homogyno sylvestris-Fagetum, Anemono-Fagetum). Uspeva v večini smrekovih združb, v macesnovju (Rhodothamno-Laricetum) in alpskem ruševju (Rhododendro hirsuti-Pinetum prostratae = Rhodothamno-Rhododendretum hirusti). Keywords: gozdne združbe, bela jelka, Abies alba, jelovi gozdovi, fitocenologija, sintaksonomija, Slovenija Published in DiRROS: 17.11.2020; Views: 1408; Downloads: 401 Full text (675,63 KB) |
66. Namnožitev osmerozobega in šesterozobega smrekovega lubadarja v Sloveniji v 2020Nikica Ogris, Marija Kolšek, 2020, professional article Keywords: Ips typographus, Pityogenes chalcographus, namnožitev, navadna smreka, Picea abies, osmerozobi smrekov lubadar, šesterozobi smrekov lubadar, lokacija, populacija, gostota, model, RITY-2, CHAPY-1 Published in DiRROS: 30.07.2020; Views: 1591; Downloads: 830 Link to full text This document has many files! More... |
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68. Veverice so pogrizle smrekove brste in naredile preprogo iz smrekovih vejic na Pohorju v zimi 2008/09Nikica Ogris, Nenad Zagorac, 2009, professional article Keywords: smreka, Picea abies, veverice, brsti, škoda, Pohorje, gozdovi, varstvo gozdov Published in DiRROS: 29.07.2020; Views: 1438; Downloads: 712 Link to full text This document has many files! More... |
69. Osip smrekovih iglic, Lirula macrosporaTine Hauptman, Marijan Denša, 2009, professional article Keywords: smreka, Picea abies, Lirula macrospora, iglice, bolezni drevja, gozdovi, varstvo gozdov Published in DiRROS: 29.07.2020; Views: 1433; Downloads: 764 Link to full text This document has many files! More... |
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