Peer-reviewed articles 17,970 +


Olga Miezite; Baiba Jansone; Dace Brizga; Linards Sisenis
•    Prof. DSc. Oleksandr Trofymchuk, UKRAINE 
•    Prof. Dr. hab. oec. Baiba Rivza, LATVIA
One of the long-term goals of the certification systems (FSC (Forest Stewardship Council) and PEFC (Program for the Endorsement of Forest Certification)) of sustainably managed forests that provide both social, environmental, and economic benefits is to completely phase out the use of chemical pesticides to protect planting material. It is in the interest of both nurseries and forest owners to find successful alternative, environmentally friendly solutions to safeguard pine saplings against Curculionidae. The studied two-year-old pine stands are located in the Hylocomiosa forest type with a total area of 4.27 ha. In 2016 clear-cutting was carried out, and in the spring of 2018, containerized seedlings were planted in areas with partial soil scarification in three repetitions in each area. Six plots with three variants in each of the repetitions were prepared. The work aims to evaluate the effectiveness of the use of P.sylvestris protection against damage Curculionidae while comparing untreated (control) lots with the ones treated with the systemic insecticide Actara or wax based on the number of damages and growth of seedlings. The intensity of tree damage and the incidence of damage over two years, depending on the type of seedling treatment, was assessed, and the average tree heights were measured and compared. With an increase in the incidence of weevil damage, the intensity of damage is also observed. At the same time, a significant (p>0.05) difference in lesions between the types of treatment of seedlings has not been established. Within two years, the death of trees due to weevil damage is insignificant - 2 % of all seedlings treated with the systemic insecticide Actara, 5 % of seedlings treated with wax Kvaae, and 6 % of untreated seedlings or control. The treatment of seedlings significantly affected their growth in the first and second years after planting (p<0.05). The use of wax Kvaae resulted in higher costs and similar protection effectiveness as the use of chemical means.
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[2] Wallertz K., Bjorklund N., Hjelm K., Petersson M., Sundblad L. G., Comparison of different site preparation techniques: quality of planting spots, seedling growth and pine weevil damage, New Forests, vol. 49/issue 6, pp 705–722, 2018.
[3] Lalik M., Galko J., Nikolov C., Rell S., Kunca A., Modlinger R., Holusa J., Nonpesticide alternatives for reducing feeding damage caused by the large pine weevil (Hylobius abietis L.), Annals of Applied Biology, vol. 177/issue1, pp 132–142, 2020.
[4] Baumanis I., Jansons A., Neimane U., Priede. Selekcija, genetika un seklkopiba Latvija. (Pine tree. Breeding, genetics and seed production in Latvia), (In Latvian) Salaspils, Latvian State Forestry Institute “Silava”, 2014, 325 p.
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[6] Luoranen J., Viiri H., Soil preparation reduces pine weevil (Hylobius abietis (L.)) damage on both peatland and mineral soil sites one year after planting, Silva Fennica, vol.46/issue1, pp 151–161, 2012.
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[8]. Bjorklund N., Movement Behaviour and Resource Tracking in the Pine Weevil Hylobius abietis Niklas Bjorklund, Acta Universitatis Agriculturae Sueciae, 2004, 17 p.
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[10] Eidmann H. H., Nordenhem H., Weslien J., Physical protection of conifer seedlings against pine weevil feeding, Scandinavian Journal of Forest Research, vol.11/issue1–4, pp 68–75, 1996.
[11] Miezite O., Okmanis M., Indriksons A., Ruba J., Polmanis K., Freimane L., Assessment of Sanitary Conditions in Stands of Norway Spruce (Picea Abies Karst.) Damaged by Spruce Bud Scale (Physokermes Piceae Schrnk.), iForest, vol. 6, pp 73-78, 2013.
[12] Arhipova, I., Balina, S., Statistika ekonomika. Risinajumi ar SPSS un Microsoft Excel (Statistics in Economics. Solutions with SPSS and Microsoft Excel), (in Latvian), Riga: Computer Science Center, 2003, 352 p.
[13] Bjorklund N., Nordlander G., Bylund H., Host-plant acceptance on mineral soil and humus by the pine weevil Hylobius abietis (L.), Agricultural and Forest Entomology, vol. 5/issue 1, pp 61–66, 2003.
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[15] von Sydow, Abundance of pine weevils (Hylobius abietis) and damage to conifer seedlings in relation to silvicultural practices. Scandinavian Journal of Forest Research, vol 12/ issue 2, pp 157–167, 1997.
Proceedings of 22nd International Multidisciplinary Scientific GeoConference SGEM 2022
22nd International Multidisciplinary Scientific GeoConference SGEM 2022, 06-08 December, 2022
Proceedings Paper
STEF92 Technology
International Multidisciplinary Scientific GeoConference SGEM
SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Serbian Acad Sci and Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts and Letters; Acad Fine Arts Zagreb Croatia; Croatian Acad Sci and Arts; Acad Sci Moldova; Montenegrin Acad Sci and Arts; Georgian Acad Sci; Acad Fine Arts and Design Bratislava; Turkish Acad Sci.
06-08 December, 2022
Scots pine, Hylobius abietis L., weevils, insecticide Actara, treated and untreated seedlings

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