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Laboratorijsko preučevanje učinkovitosti spinosada in spinetorama pri zatiranju žitnih žužkov (Sitophilus spp., Coleoptera, Curculionidae) na zrnju ozimne pšenice (Triticum aestivum L.)
Snoj, Martin (Author), Trdan, Stanislav (Mentor) More about this mentor... This link opens in a new window

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Abstract
V Entomološkem laboratoriju Katedre za fitomedicino, kmetijsko tehniko, poljedelstvo, pašništvo in travništvo na Oddelku za agronomijo Biotehniške fakultete v Ljubljani smo v letu 2016 začeli izvajati poskus o učinkovitosti spinosada in spinetorama pri zatiranju žitnih žužkov v gojitvenih komorah. V poskusu smo uporabili odrasle osebke vrst Sitophilus granarius, S. oryzae in S. zeamais iz Srbije in S. zeamais iz Slovenije, ki smo jih za potrebe poskusa namnoževali na zrnju ozimne pšenice pri sobni temperaturi. V gojitvenih komorah smo preučevali delovanje insekticidov spinosada in spinetorama na odrasle osebke žithih žužkov v treh koncentracijah (0,5, 1,0 in 2,0 mg aktivne snovi/kg zrnja) pri 25 °C in 60 % relativni zračni vlagi. Poskus je potekal v 100 ml erlenmajericah z zrnjem štirih sort ozimne pšenice, cv. ‘Arezzo’, ‘Fidelius’, ‘Cimabue’ in ‘Olimpija’. Vsako obravnavanje je bilo v poskusu ponovljeno devetkrat. Smrtnost hroščev smo ugotavljali 7., 14., in 21. dan po izpostavitvi škodljivcev insekticidoma. Rezultati našega poskusa so pokazali, da je bil generalno gledano bolj učinkovit spinetoram, ki je imel 90 % povprečno korigirano smrtnost, spinosad pa 84 %. Med sortami ozimne pšenice smo potrdili razlike v smrtnosti hroščev, in sicer smo največjo smrtnost potrdili na sortah 'Olimpija' in 'Cimabue', (96% korigirana smrtnost) najmanjšo pa na sortah 'Arezzo' in 'Fidelius', ki sta bili tretirani s fungicidom. Največjo smrtnost pri vrsti Sitophilus, pa smo generalno zabeležili pri S. granarius (Srbija) (94 %) in S. oryzae (Srbija) (95 %).

Language:Slovenian
Keywords:varstvo rastlin, črni žitni žužek, Sitophilus granarius, koruzni žužek, Sitophilus zeamais, rižev žužek, Sitophilus oryzae, spinetoram, spinosad, ozimna pšenica, laboratorijski poskus, insekticida, učinkovitost
Work type:Master's thesis/paper (mb22)
Organization:BF - Biotechnical Faculty
Year:2018
Views:177
Downloads:80
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Secondary language

Language:English
Title:LABORATORY EVALUATION OF EFFICACY OF SPINOSAD AND SPINETORAM IN CONTROLLING Sitophilus spp. (Coleoptera, Curculionidae) WEEVILS ON WINTER WHEAT (Triticum aestivum L.) GRAINS
Abstract:
At the Entomological Laboratory in the Chair for Phytomedicine, Agricultural Engineering, Field Crops Production, Pasture and Grassland Management (Dept. of Agronomy, Biotechnical Faculty in Ljubljana) we performed laboratory experiment of insecticidal efficacy of spinosad and spinetoram against Sitophilus spp. weevils in the rearing chambers in 2016. In the experiment we used adults of Sitophilus granarius, S. oryzae and S. zeamais from Serbia, and adults of S. zeamais from Slovenia, which were grown in the grains of winter wheat under room conditions for the purposes of laboratory investigation. In the rearing chambers we tested the efficacy of insecticides spinosad and spinetoram to adults in three different concentrations (0,5, 1,0, and 2,0 mg active ingredient/kg grain) at 25 °C and 60 % relative humidity. The experiment was carried out in 100 ml vials, which were filled with grains of four winter wheat varieties, i.e. ‘Arezzo’, ‘Fidelius’, ‘Cimabue’, and ‘Olimpija’. All treatments were tested in 10 repetitions. Mortality of the weevils was assessed 7, 14, and 21 days after their exposal to both insecticides. Results of our experiment showed that spinetoram influenced higher mortality (90 %) of the beetles compared to spinosad (84 %). Between different winter wheat varieties we confirmed differences in mortality of the adults, since the highest mortality (96 %) was established in varieties 'Olimpija' and 'Cimabue', and the lowest in varieties 'Arezzo' and 'Fidelius', which were treated with fungicides. The highest mortality was confirmed with Serbial populations of S. granarius (94 %) and S. oryzae (95 %).

Keywords:plant protection, granary weevil, Sitophilus granarius, maize weevil, Sitophilus zeamais, rice weevil, Sitophilus oryzae, spinetoram, spinosad, winter wheat, laboratory experiment, insecticides, efficacy

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