Diseases
Area and severity of Common Alfalfa Leaf Spot (Pseudopeziza medicaginis (Lib.) Sacc.)
Object description Download GIS-layers
Authors:
Specialist-biologist A.P. Dmitriev,GIS-specialist M.I. Saulich
Date of creation:
30.05.2005.Scale:
1:20 000 000Accuracy of map:
Map was created based on materials of maps of natural scale 1: 33 000 000.Projection:
"Alber.s Equal Area Conic for Russia", 9, 1001, 7, 100, 0, 44, 68, 0, 0Basic contents:
Vector map. Area of species distribution and zones of disease severity are shown by polygons.Accuracy of classifier:
In the species area of distribution the zone of disease severity was allocated according to the climatic conditions promoting the fungus development.Method of map production:
Scientists were given maps with boundaries of Oblasts and arable lands. After reviewing historic literature, species distribution was hand drawn on maps. If data were on the Oblast-level, distribution is on the Oblast level. In some cases, Oblast.s are further refined by boundaries of the Arable Land Map (Koroljeva et al., 2003). Hand drawn maps were scanned, georeferenced and vectorized. The area of fungus distribution was identified according to results of the analysis of published data on fungus distribution (Karavyanskii & Mazur, 1984). The zone of severity was allocated in regions where weather conditions frequently promote high disease intensity that reduces hay yield by 20% and seed yield by 60% (Tarkovskii, 1974).Reference citations:
Karavyanskii N.S., Mazur O.P. 1984. Complex system. Zashchita rastenii 10: 24-26. (In Russian)Koroljeva IE, Vilchevskaya EV, Ruhovich DI. 2003. Digital Arable Land Map. Laboratory of Soil Information of the Dokuchaev Soil Institute, Moscow, Russia [Based on: Yanvareva LF. (ed.), Martynjuk KN., Kisileva NM. 1989. Map of Land Use, Faculty of Geography, Moscow State University, Moscow, Russia.].
Tarkovskii M.I. 1974. Lucerne. Moscow: Kolos. 240 p. (In Russian)