12 research outputs found
Ecological assessment of water quality of the Tisza by physico-chemical and biological parameters
Limnodrilus hoffmeisteri claparede, 1862 as a dominant species in the Tisa dead-arm (Äurug-Biserno Ostrvo) Oligochaeta community
Uticaj etarskih uija iz tri vrste biljaka roda Cymbopogon na ponaŔanje kestenjastog braŔnara (Tribolium castaneum Herbst)
Behavior bioassays were conducted in the laboratory (23 Ā± 1Ā°C and 50 Ā± 5% r.h.) using the olfactometer to determine the effects of essential oils of three plant species in the Cymbopogon genus (Lemongrass), Cymbopogon nervatus, C. proximus and C. schoenanthus, on adults of Tribolium castaneum. The effect of essential oils was compared to a commercial biopesticide based on azadirachtin at three concentrations (0.0001, 0.001 and 0.01%). The results showed that all essential oils and the azadirachtin-based biopesticide had significant (p lt 0.05) repellent effects on T. castaneum adults at all tested concentrations, except C. proximus essential oil which showed a neutral effect at the lowest concentration. The highest concentrations of the essential oils of C. nervatus and C. proximus had significantly stronger repellent effects (p lt 0.05) than the lowest concentration. At the concentrations of 0.0001 and 0.001% all tested essential oils and azadirachtin showed a similar repellent effect without statistically significant difference, whereas the oil of C. nervatus had the highest repellent effect on adults of T. castaneum at the 0.01% concentration. Considering all tested variations, the essential oils of plants of the genus Cymbopogon showed similar or stronger repellent effects on T. castaneum adults than the biopesticide based on azadirachtin.U laboratorijskim uslovima (24Ā±1Ā°C i 50Ā±5% r.v.v.) je pomoÄu olfaktometra ispitivan uticaj etarskih ulja iz tri biljne vrste roda limunovih trava (Cymbopogon nervatus, Cymbopogon proximus i Cymbopogon schoenanthus) na ponaÅ”anje (atraktivnost/repelentnost) adulta T. castaneum. Uticaj etarskih ulja na ponaÅ”anje kestenjastog braÅ”nara, poreÄen je sa uticajem biopesticida na bazi azadirahtina u tri koncentracije: 0.0001, 0.001 i 0.01%. Rezultati testiranja pokazali su da sva etarska ulja i biopesticid na bazi azadirahtina u svim ispitivanim koncentracijama ispoljavaju statistiÄki znaÄajan odbijajuÄi uticaj - repelentni efekat na adulte kestenjastog braÅ”nara, osim najniže koncentracije ulja iz biljke C. proximus koja je ispoljila neutralan efekat na braÅ”nara. NajviÅ”a koncentracija ulja iz biljaka C. nervatus i C. proximus je ispoljila statistiÄki znaÄajno jaÄi repelentni efekat u odnosu na najnižu koncentraciju. Sva ispitivana etarska ulja i azadirahtin su u koncentracijama 0.0001 i 0.001% ispoljila sliÄan repelentni efekat bez statistiÄki znaÄajne razlike, dok je ulje iz biljke C. nervatus u koncentraciji 0.01% prouzrokovalo statistiÄki znaÄajno jaÄi repelentni efekat na adulte kestenjastog braÅ”nara u odnosu na ostale ispitivane supstance. Na osnovu rezultata istraživanja sa adultima kestenjastog braÅ”nara može se zakljuÄiti da su etarska ulja iz tri vrste biljaka iz roda Cymbopogon ispoljila sliÄan i/ili jaÄi repelentni efekat od biopesticida na bazi azadirahtina. TakoÄe, dobijeni rezultati pokazuju znaÄajan potencijal upotrebe ulja ovih biljaka kao prirodnog sredstva za zaÅ”titu uskladiÅ”tenih biljnih proizvoda