Osjetljivost crvenog žitnog balca (Oulema melanopus L.) na insekticide

master's thesis

• Title (english): Sensitivity of cereal leaf beetle (Oulema melanopus L.) to insecticides
• Author: Kristina Đopar
• Mentor: Ivan Juran (mentor)
• Committee member: Ivan Juran (predsjednik povjerenstva)
• Committee member: Tanja Gotlin Čuljak (član povjerenstva)
• Committee member: Ana Pospišil (član povjerenstva)
• Granter: University of Zagreb; Faculty of Agriculture; (Plant Pathology); Zagreb
• Defense date and country: 2019-09-09, Croatia

Abstract

Žitni balci (Oulema sp.) ubrajaju se u najvažnije štetnike strnih žitarica u Europi, a najradije napadaju zob, zatim ječam i pšenicu. Ličinke se hrane izgrizanjem uskih pruga u lišću ostavljajući epidermu. Zbog takvog načina ishrane i bijele epiderme, na lišću nastaju bijele i uske pruge. Jedan od glavnih problema odnosno nedostataka kemijskih mjera jest pojava slabije osjetljivosti štetnika na insekticid odnosno pojava rezistentnosti. Cilj rada je utvrditi različitu razinu osjetljivosti odraslih oblika žitnog balca na aktivne tvari iz skupine organofosfornih insekticida, piretroida i neonikotinoida. Tijekom 2019. godine prikupljeni su odrasli oblici crvenog žitnog balca s 11 lokacija na području kontinentalne Hrvatske. Jedinke su dopremljene na Zavod za poljoprivrednu zoologiju gdje su postavljeni laboratorijski pokusi prema IRAC test metodi broj 007. Tretiranje populacija aktivnom tvari klorpirifos, rezultiralo je rezistentnošću na lokacijama Kobilić i Đurđevac te postoji mogućnost da je rezistentnost na organofosforne insekticide prisutna na drugim, do sada neistraživanim lokacijama. Istraživanje je pokazalo nisku učinkovitost cipermetrina na gotovo svim lokacijama, a u usporedbi s prijašnjim istraživanjima može se reći kako je rezistentnost crvenog žitnog balca na piretoride prisutna. Sve istraživane populacije crvenog žitnog balca pokazale su rezistentnost na aktivnu tvar tiakloprid. Primjenom agrotehničkih mjera i dobrom poljoprivrednom praksom moguće je odgoditi ili spriječiti pojavu rezistentnosti, a kod primjene insekticida potrebno je obratiti pozornost na promjenu pripravaka s različitim mehanizmom djelovanja od prethodno korištenog.

Abstract (english)

Leaf beetles (Oulema sp.) are among the most important pests of grain cereals in Europe, they are most likely to attack oats, then barley and wheat. Larvae are fed by biting narrow stripes on leaves leaving epidermis. Because of such way of nutrition and white epidermis, white and narrow stripes are being formed on the leaves. One of the main problems i.e. shortcoming of chemical measures is the phenomenom of weaker susceptibility of the pest to insecticide i.e. the occurrence of resistance. The aim of this research is to determine a different level of sensitivity of adult forms of Cereal leaf beetle to active substances from the group of organophosphorus insecticides, pyrethroids and neonicotinoids. During 2019, adult forms of Cereal leaf beetle are collected from 11 locations in the area of Continetal Croatia. Insect individuals are transported to Department of Agricultural Zoology where laboratory experiments were set up according to the IRAC test method number 007. Treatment of populations with active substance chlorpyrifos resulted in resistance on locations Kobilić and ĐurĎevac and there is a possibility that the resistance on organophosphorus insecticides is present on other, until now unexplored locations. Research has shown low efficiency of cypermethrin on almost every location, and compared to the previous research it can be said that resistance of Cereal leaf beetle to pyrethroids is present. All surveyed populations of Cereal leaf beetle showed resistance to active substance thiacloprid. By transmitting agrotehnical measures and good agricultural practice, it is possible to delay or prevent the occurrence of resistance, and when applying insecticides it is necessary to pay attention to the change of preparations with different mechanism of action from the previously used.

• Keywords: crveni žitni balac; Oulema melanopus; rezistentnost; klorpirifos; cipermetrin; tiakloprid
• Keywords (english): cereal leaf beetle; Oulema melanopus; resistance; chlorpyrifos; cypermethrin; thiacloprid
• Language: croatian
• URN:NBN: urn:nbn:hr:204:909832
• Study programme: Title: Phytomedicine; Study programme type: university; Study level: graduate; Academic / professional title: magistar/ magistra inženjer/inženjerka fitomedicine (magistar/ magistra inženjer/inženjerka fitomedicine)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2019-09-23 06:49:07