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HRVATSKI GEOLOŠKI INSTITUT CROATIAN GEOLOGICAL SURVEY

DIJATOMITI U HRVATSKOJ: NJIHOV POTENCIJAL KAO PRIRODNI INSEKTICID DIATOMITE IN CROATIA: THEIR POTENTIAL AS NATURAL INSECTICIDE

Ines Galović1, Josip Halamić1, Vlatka Rozman2, Zlatko Korunić3, Anita Liška2, Renata Baličević2, Pavo Lucić2

1Hrvatski geološki institut, Sachsova 2, 10000 Zagreb, Republika Hrvatska 2Poljoprivredni fakultet u Osijeku, Sveučilište Josipa Jurja Strossmayera u Osijeku, Kralja Petra Svačića 1d, 31000 Osijek, RH 3Diatom Research and Consulting Inc., 14 Tidefal Dr. Toronto, ON, MW 1J2, Canada

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HRVATSKI GEOLOŠKI INSTITUT CROATIAN GEOLOGICAL SURVEY

Croatian Science Foundation (HRZZ) - call: IP-11-2013 (three-year research project) Project title: Development of new natural insecticide formulations based on inert dusts and botanicals to replace synthetic, conventional insecticides

• Project acronym: DIACROMIXPEST
• Project No. IP-11-2013-5570
• Period: from 1 July 2014 to 30 June 2017
• Project leader: Prof. Ph. D. Vlatka Rozman (FoA Osijek)

HRVATSKI GEOLOŠKI INSTITUT CROATIAN GEOLOGICAL SURVEY

PROJECT TEAM

Professor Vlatka Rozman Project leader Institution: Faculty of Agriculture, University of Osijek Assistant Professor Anita Liška Associate Professor Renata Baličević Pavo Lucić, MSc. Ing. Agr.

• Ph. D. Zlatko Korunić

Professor Josip Halamić Research Associate Ines Galović

HRVATSKI GEOLOŠKI INSTITUT CROATIAN GEOLOGICAL SURVEY

What is diatomite (diatomaceous earth)?

Porous, fine-grained siliceous sedimentary rock mainly composed of fossilized (amorphous opaline silica: SiO2·nH2O) remains of diatoms formed in marine to freshwater environments of mid-high

• latitudes. When diatomite is crushed into a powder, it is usually called “diatomaceous earth,” or D.E.

http://earthcore.weebly.com/diatomace

• us-earth.html

http://diatomaceous.

• rg/food-grade-

diatomaceous-earth/ https://www.flickr.com/photos/rockbandit/169 058743/

HRVATSKI GEOLOŠKI INSTITUT CROATIAN GEOLOGICAL SURVEY

Marine sediments

HRVATSKI GEOLOŠKI INSTITUT CROATIAN GEOLOGICAL SURVEY

• first diatomites are known from Dolje
• utcrops, Medvednica Mt., based on diatom

analyses

• f

diatomaceous tripolite (PANTOCSEK, 1903, JURILJ, 1957, KOCHANSKY-DEVIDE & BAJRAKTAREVIĆ, 1981 i GALOVIĆ & BAJRAKTATRVIĆ, 2006), and Lopatice i Gornja Šemnica, Hrvatsko Zagorje (BAJRAKTAREVIĆ, 1984)

• First applied terminology of diatomites

were used by GORJANOVIĆ- KRAMBERGER (1908) and Jurilj.

• during the investigations for OGK RH

1:50000 from 2000 to 2004. few more

• utcrops
• f

tripolite (diatomite) was discovered: at Medvednice (Markuševec section), Hrvatsko Zagorje (Crkovec), Plešivice (Jurjevčani) and Požega.

• The

investigations

• n

HRZZ project induced few more potential diatomite

• utcrops in Banovina and Slavonija.

Localities of potential diatomites in North Croatia.

HRVATSKI GEOLOŠKI INSTITUT CROATIAN GEOLOGICAL SURVEY

The typical chemical composition

• f
• ven-dried

diatomaceous earth is 70 to 90% silica, with 2 to 4% alumina (attributed mostly to clay minerals) and 0.5 to 2% iron oxide. Preliminary results on diatom analyses indicate dominance

• f

Coscinodiscus spp., Thalassionema nitzschoides (GRUNOW) MERESCHKOWSKY and resting spores, which dimensions are less than 50 microns.

HRVATSKI GEOLOŠKI INSTITUT CROATIAN GEOLOGICAL SURVEY

Usage of Diatomaceous Earth DE is used as a filtration aid, mild abrasive in products including metal polishes and toothpaste, mechanical insecticide, absorbent for liquids, matting agent for coatings, reinforcing filler in plastics and rubber, anti-block in plastic films, porous support for chemical catalysts, cat litter, activator in blood clotting studies, a stabilizing component

• f

dynamite, and a thermal insulator.

HRVATSKI GEOLOŠKI INSTITUT CROATIAN GEOLOGICAL SURVEY

Acknowledgement Financial support was provided by the Croatian Science Foundation (HRZZ): Scientific research project IP-11-2013-5570: “Development of new natural insecticide formulations based on inert dusts and botanicals to replace synthetic, conventional insecticides“ www.diacromixpest.eu Thank you for your attention!