Proljetna distribucija prezimjelih imaga hrastove mrežaste stjenice u ovisnosti o stupnju razvijenosti hrastova lišća

master's thesis

• Title (english): Spring distribution of overwintered oak lace bugs in relation with the degree of oak leaf development
• Author: Hrvoje Rastovac
• Mentor: Boris Hrašovec (mentor)
• Committee member: Boris Hrašovec (predsjednik povjerenstva)
• Committee member: Milivoj Franjević (član povjerenstva)
• Committee member: Linda Bjedov (član povjerenstva)
• Granter: University of Zagreb; Faculty of Forestry and Wood Technology; (Institute of Forest Protection and Wildlife Management); Zagreb
• Defense date and country: 2022-09-23, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Forestry

Abstract

U ovom radu provedena su istraživanja o proljetnoj distribuciji prezimjelih imaga hrastove mrežaste stjenice u ovisnosti o stupnju razvijenosti hrastova lišća. Hrastova mrežasta stjenica (Corythucha arcuata) je invazivna vrsta štetnika podrijetlom iz Sjeverne Amerike koja uzrokuje brojne simptome (diskoloraciju lista na kojem se nalazi) i štete (sušenje i preuranjeno opadanje lišća), a u Hrvatskoj je zabilježena 2013.godine. Cilj ovog rada bio je utvrditi razlike u prostornoj distribuciji prezimjelih imaga hrastove mrežaste stjenice, odnosno pratiti nalet stjenice na lišće lužnjakova lista na objektu koji obuhvaća cijeli spektar od najranijih formi do najkasnijih (Quercus robur var. praecox – Quercus robur var. tardissima). Područje istraživanja bio je pokusni nasad hrasta lužnjaka Jastrebarsko, koji se nalazi na području UŠP Karlovac, na kojem su odrađeni terenski izlasci. Na terenskim istraživanjima, uz prikupljene uzorke hrastova lišća sa stabalaca ranih i kasnih hrastova u fenofazama 2 i 7, izvršeno je snimanje pokusnog nasada dronom. U laboratoriju su izdvojeni prikupljeni uzorci listova hrasta lužnjaka na kojima su uočena i evidentirana jajna legla, nakon kojega su isti skenirani skenerom. Dobivene slike skeniranih listova digitalno su obrađene u računalnom programu ImageJ. Uz korištenje računalnog programa, dobiveni su rezultati prikazani tablično i grafički, a u kojima su prikazane ukupne površine, oštećene površine te postotci oštećenja lisnih površina uzrokovani utjecajem hrastove mrežaste stjenice u ovisnosti o stupnju razvijenosti hrastova lišća (fenofaze 2 i 7). Temeljem postavljenih ciljeva u ovom radu utvrđena je neznatna razlika pridolazaka jajnih legala na donjimstranama listovahrastalužnjaka, izmeđufaze2ifaze7 fenologije hrasta lužnjaka, te veći i izloženiji naleti prezimjelih imaga hrastove mrežaste stjenice na listovima ranih hrastova, dok je izloženost izrazito kraća na listovima kasnih hrastova.

Abstract (english)

In this thesis, research has been carried out on the spring distribution of overwintered oak mesh bedstead imagas depending on the degree of development of oak leaves. Oak mesh bedbug (Corythucha arcuata) is an invasive species of pest originating in North America that causes a number of symptoms (discoloration of the leaf on which it is located) and damage (drying and premature decline of leaves), and was recorded in Croatia in 2013. The aim of this paper was to determine the differences in the spatial distribution of overwintered oak mesh bedstead imagas, that is, to monitor the bedbug's rush to the leaves of the alkaline leaf on the object, which covers the entire spectrum from the earliest forms to the latest (Quercus robur var. praecox – Quercus robur var. tardissima). The area of research was a test plantation of the Jastrebarsko pedunculate oak, which is located in the area of UŠP Karlovac, where field outings were made. Onfield studies, in addition to the collected samples of oak leaves from early and late oak trees in phenophases 2 and 7, a drone test plantation was imaging. In the laboratory, collected samples of oak leaves of pedunculate were extracted on which egg litters were spotted and recorded, after which they were scanned with a scanner. The resulting images of the scanned sheets are digitally processed in the ImageJ computer program. With the use of a computer program, the results were obtained, which presented tabulatedly and graphically, in which the total surfaces, damaged surfaces and the percentages of damage to aphids caused by the influence of an oak mesh bed depending on the degree of development of oak leaves (phenophase 2 and 7) are presented. Based on the objectives set in this paper, a slight difference of arrivals of egg litters on the lower sides of pedunculate oak leaves was found, between phase 2 and phase 7 of pedunculate oak phenology, and greater and more exposed gusts of overwintered oak mesh bed imaga on the leaves of early oaks, while theexposureis extremely shorteronthe leaves of late oaks.

• Keywords: Invazivna vrsta; Corythucha arcuata; fenologija; (Quercus robur)
• Keywords (english): Invasive type; Corythucha arcuata; Phenology; (Quercus robur
• Language: croatian
• URN:NBN: urn:nbn:hr:108:975690
• Study programme: Title: Forestry; department; Techniques, Technologies and Management in Forestry; specializations in: Techniques, Technologies and Management in Forestry, Techniques, Technologies and Management in Forestry; Course: Techniques, Technologies and Management in Forestry; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka šumarstva (magistar/magistra inženjer/inženjerka šumarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2022-11-17 07:49:57