Osmerozobi smrekov lubadar (Ips typographus, Col.:Scolytidae) v območju Črnega vrha na Kočevskem:Spremljanje in kratkoročna napoved škod : diplomsko delo - visokošolski strokovni študij

Kalič, Marko (author), Jurc, Maja (mentor)

V okviru strategije profilakse je bila, v nižinskih smrekovih gozdovih GGE Vrbovec na Kočevskem v letu 2004, med drugim uporabljena metoda kontrolno-lovnih pasti Theysohn, za kontrolo in redukcijo populacije Ips typographus. V ta namen je bilo postavljenih 107 omenjenih pasti na 54 lokacijah, v katerih smo spremljali ulov skozi celotno vegetacijsko sezono (odaprila do septembra). Na podlagi ulova smo ugotavljali dinamiko populacije in jo primerjali s škodami na smreki zaradi vrste Ips typographus. Naloga zajema še analizo škod na smreki zaradi žuželk na nivoju GGO Kočevje in GGE Vrbovec. S snemanjem žarišč smo ugotavljali prostorske značilnosti pojavljanjavrste Ips typographus. Z raziskavo smo ugotovili upadanje ulova s časom trajanja ulova. Največji ulov je bil v tretji dekadi aprila in prvi dekadi maja. Maksimumi ulova predstavljajo rojenje generacij. V letu 2004 sta se razvili dve čisti generaciji, o sestrski generaciji na podlagi ulova ni mogoče sklepati. Za kratkoročno napoved smo ugotavljali korelacije med ulovi vpasteh po žariščih v spomladanskem obdobju in količino odkazanih smrekovih lubadark. Pomladanski ulov (april - junij) predstavlja 82 % celotnega ulova (april - september). Kumulativa ulova v pasteh po žariščih v spomladanskem obdobju je v korelaciji s količino sanitarnega odkazila v predelu pasti. Prav tako je iz te korelacije ugotovljena regresija med povprečnim ulovom na past vžarišču (št. osebkov/past) v spomladanskem obdobju in gostota sanitarnih sečenj smreke v žarišču. Dobljeni rezultati niso primerljivi s podobnimi raziskavami drugih avtorjev, zaradi enoletne spremljave ulova in količine sanitarnega odkazila ter metodologije dela, ki je bila v našem primeru uporabljena v operativni rabi za redukcijo populacije vrste Ips typographus.

• Language: Slovenian
• Keywords: Ips typographus, nižinski smrekovi gozdovi, režaste kontrolno lovne pasti Theyson, spremljanje, kratkoročna napoved, Kočevje
• Work type: Undergraduate thesis
• Typology: 2.11 - Undergraduate Thesis
• Organization: BF - Biotechnical Faculty
• Place of publishing: Ljubljana
• Publisher: [M. Kalič]
• Year: 2006
• Number of pages: IX, 88 str.
• PID: 20.500.12556/RUL-15358
• UDC: 630
• COBISS.SI-ID: 1795750
• Publication date in RUL: 11.07.2014

Secondary language

• Language: English

Abstract

In the scope of preventive strategy the method of Theysohn's control - catch traps used for controlling and reduction of Ips typographus population was used in the lowlands spruce forest GGE Vrbovec, Kočevska in 2004. For this purpose there were 107 traps on 54 locations, monitoring the number of trappedbark beetles during the entire season (from April to September). On thebasis of the catch we tried to establish the distribution of the populationand compared it with the damages on standing spruce trees caused by the Ips typographus. The analysis of the damages on the standing spruce trees caused by the insect in forest management area of Kočevje (GGO Kočevje) and forest management unit Vrbovec (GGE Vrbovec) is also included in this thesis. By observing focal points we tried to establish spatial patterns of the spreadof Ips typographus. We found out that the catch decrease corresponds with the catch duration. The largest catch of Ips typographus was in the 3rd decade of April and in the 1st decade of May. The maxima of the catch represent swarming of generations. In 2004 two generations developed. Sister generations were not observed on the catch basis. For the short - termed prognosis we tried to establish correlations between the trap - catches by individual focal points in the spring time and the amount of infected spruce trees cut. The spring catch (from April to June) presents 82 % of whole catch (from April to September). The catch cumulations in traps by individual focal points in the spring time is in correlation with the amount of trees cut for sanitary purpose in area of traps. From this correlation we also established the regression between the average catch per trap (number of subjects per trap) during spring time and the relative amount of spruce tree cut in the focal points. The acquired results are not comparable with the similar research projects of other authors, because of a one - year observation of thecatch and the amount of trees cut for sanitary purpose and also the methodology of work, in our case used with an operational aim for the reduction of species (Ips typographus) population.