Diseases

Area of Ascochyta Leaf Spot of Oats Ascochyta avenae (Petr.) Sprague et Johnson.

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 using maps of natural scale 1:33 000.000.

Projection:

"Alber's Equal Area Conic for the USSR", 9, 1001, 7, 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:

Within the disease area, the zone of severity was determined to be where disease development can reach 20-30% infested plants resulting in essential yield losses.

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 determined based on the following sources regarding fungus distribution: Shestiperova & Polozova (1973), Ishkova (2002). Within this zone disease development does not reach epidemic levels of development and harm is minimal. The zone of severe disease harm was based on the work of Shestiperova & Polozova's (1973) which reports on significant disease distribution in the Northwest of the Russian Federation and in Byelorussia.

Reference citations:

Ishkova T.I., Berestetskaya L.I., Gasish E.L., Levitin M.M., Vlasov L.Yu. 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:

All rights reserved. Copyright 2004 © A.P. Dmitriev, M.I. Saulich (map and description) and A.P. Dmitriev (picture).