PESTS AND DISEASES OF SEMENOVII FIR IN KYRGYZSTAN AND MEASURES TO COMBAT THEM

Abstract

The subject of the study was the assessment of the sanitary state of fir forest in the western Tien Shan. The aim of the study was to identify diseases and pests of fir forests and to demonstrate the effectiveness of control measures. The sanitary condition of fir forests can currently be assessed relatively positively. Nevertheless, hazardous organisms are found in them. In the process of vital activity of these hazardous organisms, healthy trees dry out, plantings lose their role and ability to natural regeneration. Abstract. In general, the presence of entomological and phytopathological pests in the forest is also part of the entire forest biodiversity created by nature itself. The sanitary condition of fir forests can currently be assessed relatively positive. Nevertheless, hazardous organisms are found in them. In the process of vital activity of these hazardous organisms, healthy trees dry out, plantings lose their role and ability to natural regeneration. The most common pests of fir forests are pine Dioryctria abietella Schiff., Megastigmus (Megastigmus Sp.), Adelges (Aphrastasia pectinatae Chol.) Among the diseases of Semyonov fir, the most widespread in the nursery is fusarium lesion of seedlings, and in natural stands - rust (Melampsorella cerastii Wint.), and cenangium cancer (Cenangium abietis (Pers.) Reh. Duby, 1896). Another most common disease is Alternaria blight caused by an imperfect fungus Alternaria alternate (Fr.) Keissler. The most dangerous disease of Semyonov fir is root rot, caused by the pine fungus Fomitopsis annosa (Fr.) Karst. 1881. Also pathogens of dangerous fungal diseases were found on Semyonov fir (Trichothecium roseum (Pers.) Link 1809 and Myxotrichum chartarum Kunze, 1823).