Diseases

Area of Ascochyta graminicola Sacc. (Ascochyta hordei Hara.) - ascochyta leaf spot of rye .

Object description Download GIS-layers

Authors:

Specialist-biologist A.P. Dmitriev,
GIS-specialist M.I. Saulich

Date of creation:

19.09.2004.

Scale:

1:20.000.000.

Accuracy of map:

Map was created based on materials of maps of natural scale 1:40 000.000.

Projection:

"Alber's Equal Area Conic for the USSR", 9, 1001, 1, 100, 0, 44, 68, 0, 0

Basic contents:

Vector map. Area of species distribution and zones of disease severity are shown by polygons.

Accuracy of classifier:

Quantification of harm of this disease on rye as percent of crop decrease has not been established. Within the limits of distribution, a zone of high disease harm was designated based upon evidence that strong (up to 100%) disease development has been reported. This can result in essential crop losses due to significant losses in the leaf photosynthetic area.

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 zone of distribution was identified according to the analysis of the following published data on fungus distribution: Shestiperova & Polozova (1973), Ishkova (2002). The zone of disease harmfulness was allocated based on the work of Shestiperova & Polozova's (1973) which describes significant disease harmfulness in the North of the Russian Federation.

Reference citations:

Ishkova T.I., Berestetskaya L.I., Gasish E.L., Levitin M.M., Vlasov L.I. 2002. Diagnostics of the main fungus diseases of cereal crops. St. Petersburg: VIZR. 76 p. (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.].
Shestiperova Z.I., Polozova N.L. 1973. Powdery mildew dew and spots of summer grain crops. Leningrad: Kolos. 55 p. (In Russian)

Right and copyright:

© 2003 A.P. Dmitriev, M.I. Saulich (map and description), A.P. Dmitriev (picture).