Recommendation for the protection of planting material in forest nurseries from the most common diseases

Abstract

46 Belarusian forest nurseries were examined using up-to-date methods of molecular genetic analy-sis. The study showed that genetic characteristics of phytopathogenic microorgan isms detected on seed-lings and saplings changed significantly last years. Our research has established that forest nurseries are not only affected by typical phytopathogens, such as fungi of the genera Fusarium, Alternaria and Cladosporium . But also some new species, fo r instance fungi of the genera Phoma , Epicoccum and etc. were detected. Based on the study of modern species composition and biology of phytopathogens, the conditions for a local epiphytotic appearance and in the accordance with the requirements of the Ministry of forestry of the Republic of Belarus “Recommendations for preventing of the most common diseases of plant material in forest nurseries” were developed. The document contains the main determi-nant seedlings and saplings diseases based on visual features, the species com position of pathogens, de-scription of the main symptoms, conditions conducive for the development of plant pathogens, as well as a set of preventive and protective measures. The recommendations for timely identification of plant disease, collection, transportation, temporary storag e and transportation of samples for laboratory diag-nosis in the case of the presence of atypical symptoms are also shown in this document.