Studies on hogweed (Heracleum) restriction in Latvia in 2002-2004
2005
Olukalns, A., Farm Gravisi, Prauliena, Madona reg. (Latvia) | Berzins, A., Latvia Univ. of Agriculture, Jelgava (Latvia) | Lapins, D., Latvia Univ. of Agriculture, Jelgava (Latvia) | Lejins, A., Agency of Latvia University of Agriculture, Skriveri, Aizkraukle reg. (Latvia). Research Institute of Agriculture | Sprincina, A., Latvia Univ. of Agriculture, Jelgava (Latvia)
Heracleum sosnowskyi was introduced in Latvia as a silage plant. It has since escaped in wild to become one of the most dangerous invasive plants in native flora. Totally there are fixed 13 thousand hectares of land polluted with H. sosnowskyi (Berzins A. et al., 2002, Berzins A. et al., 2003). Trials on the possible restriction of hogweed distribution were established in Madona, Talsi and Riga districts. Methods used in restriction of hogweed distribution were divided into the following groups: mechanical, chemical, biological, and combination of these methods. Results showed that the best methods for H. Sosnowskyi restriction were as follows: cutting in flower stage, twofold use of glyphosate herbicide in one vegetation season, tribenuron-methyl herbicide applied in early growth stage, mulching with black plastic film and return of polluted lands to agricultural use for crop production.
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