Efficiency evaluation of Neem (Azadirachta indica) oil and copper-ethanolamine in the protection of wood against a subterranean termite attack: Ocena učinkovitosti nimovega olja (Azadirachta indica) ter baker-etanolaminskih pripravkov pri zaščiti lesa pred napadom podzemnega termita | Ocena učinkovitosti nimovega olja (Azadirachta indica) ter baker-etanolaminskih pripravkov pri zaščiti lesa pred napadom podzemnega termita: Efficiency evaluation of Neem (Azadirachta indica) oil and copper-ethanolamine in the protection of wood against a subterranean termite attack

English. The demand for environmentally safe preservatives for wood is increasing all around the world. This study is focused on the evaluation of the ability of Neem (Azadirachta indica) seed oil and copper-ethanolamine to protect Sydney blue gum (Eucalyptus saligna) and Ayous (Triplochiton scleroxylon) against termites. Wood blocks were impregnated with solutions of Neem oil in acetone and/or an aqueous solution of copper-ethanolamine. Impregnated woods with a retention rate of up to 108.3 kg/m3 were obtained. A leaching experiment was used to determine the fixation of preservatives in wood. The termicidial effect of the preservatives was studied through exposure in a termitarium. Neem oil was less efficient for Sydney blue gum but showed significant protection for Ayous at a higher retention rate. At the concentration investigated, the treatment of both wood species with copper-ethanolamine solution was not suitable. However, a combination of copper-ethanolamine and Neem oil showed an improvement in the protection of Sydney blue gum wood. Nevertheless, the impregnated woods still suffered an increased termite attack after leaching.

Slovenian. Povpraševanje po za okolje varnih zaščitnih sredstvih za les narašča po vsem svetu. Ta študija je osredotočena na oceno sposobnosti olja semen nima (Azadirachta indica) in baker-etanolaminskega pripravka za zaščito lesa evkalipta (Eucalyptus saligna) in sambe (Triplochiton scleroxylon) pred termiti. Lesene preizkušance smo impregnirali z raztopinami nimovega olja v acetonu in / ali baker-etanolaminski vodni raztopini. Količina navzema v impregniranem lesu je znašala 108,3 kg/m3. Vezavo zaščitnih sredstev v les smo določili z izpiranjem. Termiticidni učinek zaščitnih sredstev je bil raziskan z izpostavitvijo v termitariju. Nimovo olje je bilo manj učinkovito za zaščito lesa Evkaliptus saligna, pomembno zaščitno učinkovitost pa je pokazalo za les Triplochiton scleroxylon pri višjem navzemu. Pri uporabljeni koncentraciji baker etanolaminskega pripravka za zaščito obeh preučevanih lesnih vrst ni bila zadostna. Vendar je kombinacija baker-etanolaminskega pripravka in nimovega olja pokazala pomembno izboljšanje zaščite lesa evkalipta. Kljub temu je bil impregnirani les po izpiranju zopet bolj dovzeten za napad termitov.