Phytosanitary condition of pine plantations of the Polish Forestry State Enterprise

The relevance of the study is driven by the need to analyse pine stands damaged by phytodiseases and phytopests in the forestry units of the branch of the State Enterprise “Poliske Forestry”. The results of the analysis showed that among the plant diseases, the root sponge causes the greatest damage to pines. It was determined that most pine stands were affected by both large and small pine beetles, stenographers, and various bullion beetles. The vast majority of the affected pine plantations are in category IV forests: 35.3 hectares are damaged by insect pests, and 10.4 hectares by rootworm. By age class, the largest amount of insect damage was observed in class IV (32.3 ha), while root sponge damage amounted to 11.2 ha. The analysis of pine forests damaged by insect pests and phytodiseases by the degree of completeness showed that the unsatisfactory sanitary condition was found in forests with a relative completeness of 0.7 and 0.75. The area of plantations damaged by phytopests amounted to 25.4 hectares with a relative completeness of 0.7, while the area of forest damaged by root sponges was 10.2 hectares with a relative completeness of 0.75. Most of the forest stands suffering from damage by insect pests and pathogens are found in the first class of bonita. The area of pine plantations damaged by insect pests is 24.5 hectares, and the area damaged by root sponge is 10.4 hectares. The sanitary condition of the pine forests of the State Enterprise “Poliske Forestry” ranges from 46–52% for healthy, 28–36% for weak, 7–13% for very weak, and 10–13% for drying out and dried out. In order to improve the phytosanitary condition of forest plantations in the forestries of the branch of the State Enterprise “Poliske Forestry”, it is recommended to carry out selective sanitary felling with a felling density of 13.0–86.0 m3/ha on a total area of 146.5 hectares. Thus, according to the results of the research, the sanitary condition of pine plantations in the forestries of the branch of the State Enterprise “Poliske Forestry” branch can be considered satisfactory, which indicates timely forestry measures to protect forests.