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Weeds competing with seedlings of trees for nutrients, moisture, light and space, drown out their growth in nurseries and forest crops. Currently, in forestry, weed control is mainly carried out in forest nurseries, less often during the preparation of the area intended for afforestation, but sporadically in forest crops. The most important species of weeds threatening seedlings of forest trees include Senecio vulgaris, S. silvaticus, Deschampsia caespitosa, Pteridium aquilinum, Agropyron repens, Calamagrostis epigeios and Equisetum arvense. In Poland, herbicides have the largest share (about 50%) in the sale of plant protection products, but the scale of their use in forests is small, compared to agriculture. In 2012, 915 herbicides were registered in the country, out of which only 14 products (0.5%) were for use in forestry. In the years 1999–2019, 31 herbicides were registered for the protection of forest nurseries and crops, which included 13 active substances belonging to 11 chemical groups, of which 9 active substances have been used up to now. Most herbicides (15–16) were used in the years 2004–2006, the lowest in 1999–2000 and in 2014 (4 products). The most popular active substance has been glyphosate contained in 18 products.

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The paper presents the history of legal changes regarding forest protection in Poland and the development of forest protection services Poland's accession to the European Union in 2004 has affected the marketing and the use of plant protection products (PPPs) in the country. The implementation of the EU legislation (Directive 91/414/EEC) has resulted in a decline in the assortment of pesticides registered for use in agriculture, and in forestry. This situation resulted from the limited interest of producers in placing PPPs on the market. Furthermore, limitations in the aerial application of PPPs have been introduced, which has consequences for the protection of the forest, where aerial treatments are often the only way to reduce the number of pests. On the other hand, the introduction of integrated pest management (also in forestry) confirmed the adequacy of activities carried out in the State Forest National Forest Holding, where, for many decades, the prevention methods have been used to increase the resistance of stands and the multi-stage Decision Support System (DSS) is used to select the optimal protective method.

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