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Venenje zelenega bora (Leptographium procerum)
Barbara Piškur, Dušan Jurc, 2019

Ključne besede: varstvo gozdov, karantenski organizmi, Pinus spp., bor, L. procerum, gliva
DiRROS - Objavljeno: 23.04.2019; Ogledov: 682; Prenosov: 125
.pdf Celotno besedilo (177,35 KB)

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Spread and potential host range of the invasive oak lace bug [Corythucha arcuata (Say, 1832) - Heteroptera: Tingidae] in Eurasia
György Csóka, Anikó Hirka, Serap Mutun, Milka Glavendekić, Ágnes Mikó, Levente Szőcs, Márton Paulin, Eötvös Csaba Béla, Gáspár Csaba, Mariann Csepelényi, Maja Jurc, Dušan Jurc, 2020

Povzetek: The North American oak lace bug feeds on leaves of 'white oaks' in its native range. In Europe, it was first discovered in northern Italy in 2000. In recent years, it has subsequently spread rapidly and population outbreaks have been observed in several European countries. In the present study, we summarize the steps of its expansion. To predict its potential host range, we checked 48 oak species in 20 sentinel gardens in seven countries between 2013 and 2018. In total, 27 oak species were recorded as suitable hosts; 13 of them are globally new ones, 23 out of the 29 in section Quercus (white oaks, an intrageneric taxonomic unit within genus Quercus), including Asian oaks, native to Japan, Korea and China, and four out of five in section Cerris (another intrageneric unit of the same genus), were accepted as hosts. None of the species in section Lobatae (red oaks) or in the Ilex group was accepted. Host records were also collected in forest stands of 10 countries. We found 11 oak species that were infested. Outbreak populations were most commonly found on Quercus robur, Quercus frainetto, Quercus petraea and Quercus cerris, comprising widespread and outstandingly important oaks species in Europe. Based on our findings, we conclude that suitable hosts for oak lace bug are present in most of Europe and Asia. This means that a lack of hosts will likely not restrict further range expansion.
Ključne besede: Corythucha arcuata, host plants, non-native species, Quercus spp, sentinel gardens
DiRROS - Objavljeno: 20.02.2020; Ogledov: 162; Prenosov: 100
URL Celotno besedilo (0,00 KB)

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Comparison of two methods for monitoring urban forests health
Nikica Ogris, Tine Hauptman, Maarten De Groot, Dušan Jurc, 2019

Povzetek: We compared the performance of two methods for monitoring urban forest health. The first was based on a systematic grid (ISM), and the second on non-linear transects (UFMO). Both methods were tested during July and August 2013 in the Rožnik urban forest in the Municipality of Ljubljana (MOL). We assessed crown condition and damaging agents on 15 ISM plots, surveying an area of 92 a (are = 100 m2) in 1,640 minutes. By comparison, the UFMO method was used to survey an area of 518 a in 1,700 minutes. The performance of the ISM and the UFMO methods was 17.8 min/a and 3.28 min/a, respectively. According to the time/area performance measure, the UFMO method performed 5.4 times better than the ISM method. The UFMO method recorded 1.5 times more damaging agents per hour, 2.7 times more trees per hour, and 13.4 times more dead standing trees per hour. It also suggested 7.0 times more management measures per hour. However, the density of the data gathered was 7.1 times higher for the ISM method. According to the chosen comparison measures, the overall performance of the UFMO method exceeded the ISM method in all chosen performance measures expressed in relative time except the amount of data gathered. We conclude that, for the same sampling cost, the ISM approach produces an unbiased, but imprecise, estimate of overall forest health, while the UFMO method produces a biased, but more precise, estimate. We discuss possible improvements and further limitations of the UFMO method with an emphasis on the differences between the two methods of monitoring and surveying forest health. We conclude, that the ISM monitoring method can be supplemented with the UFMO surveying method to capitalize on the potential synergies of combining both approaches.
Ključne besede: bias, ICP Forests, performance evaluation, survey, systematic grid, transect
DiRROS - Objavljeno: 20.02.2020; Ogledov: 140; Prenosov: 129
URL Celotno besedilo (0,00 KB)

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