Area of wheat spot blotch (Helminthosporium spot blight), (causal agent Cochliobolus sativus (Ito et Kurib.) Drechsler ex Dastur., anamorph Bipolaris sorokiniana (Sacc.) Shoemaker)

Object description Download GIS-layers


Specialist-biologist L.A. Mikhailova,
GIS-specialist M.I.Saulich.

Date of creation:



1:20 000 000.

Accuracy of a map:

It is created on materials of map of natural scale 1:33 000 000.


"Alber's Equal Area Conic", 9, 1001, 7, 100, 0, 44, 68, 0, 0

Basic contents:

Vector map. Zones of distribution and severity are shown by polygons.

Accuracy of the classifier:

Area is subdivided into zones of moderate and low disease severity. In 1980 in the first zone disease development during milk-wax ripeness on a susceptible cultivar reached 43,8 % (Zdrazhevskaya S.D.,1985; Zdrazhevskaya S.D., Shugurov I.M.,1991) whereas at strong disease development of illness the area of the struck leaf surface can reach 100 % (Singh, 2003). In the second zone the development was much weaker.

Procedure of map drawing:

The zones of distribution and severity are allocated by results of the analysis of the open published materials. The general information on life cycle of the pathogen and on host-plants are taken from the publications by Wiese (1977) , Khasanov (1992), Peresypkin (1981). Zones of disease severity are drawn after information taken from the papers by Bhandari et al. (2002); Khasanov (1988); Rassadina (1972); Rudakov et al., 1989; Sharma et al., 2002; Tupenevich (1970); Tupenevich & Nesterov (1977), Zdrazhevskaya (1985); Zdrazhevskaya & Shugurov (1991). The blank map with image of the disease distribution zone has been scanned. Registration and vectoring of its raster copy have been fulfilled by standard facilities of GIS-tecnologies.

Sources of the data:

Bhandari, D., Bhatta, M.R., Duvellier, E., & Shrestha, S.M. 2003. Foliar blight of wheat in Nepal: resistance breeding, epidemiology and disease management.
Proceedings of the Fourth International Wheat Tan Spot and Spot Blotch Workshop. July 21-24, 2002. Eds. J.B. Rasmussen, T.L. Friesen, & S. Ali. NDSU,
Fargo. P.145-150.
Khasanov, B.A. 1992. Keys to fungi . causal agents of Helminthosporium diseases of Bipolaris, Drechslera and Exserohilum species. Tashkent: FAN, 243 p. (in Russian).
Khasanov, B.A. 1988. Yellow leaf spot of cereals caused by Pyrenophora-tritici-repentis (Died.) Drechs. Mikologiya i Fitopatologiya 22(1). P. 78 . 83 (in Russian)
Peresypkin, V.F. 1981, Atlas of diseases of crop cultures. Kiev: Urozhaj, 248 p. (in Russian)
Rassadina, E.G. 1973. Leaf spot blights of cereals. In: Distribution of diseases of agricultural crops in the USSR in 1968 . 1972. Leningrad: VIZR. P.40 . 41 (in Russian).
Rudakov, O.V, Titova, K.D., Pospekhov, G.V., & Fissura, N.I. 1989. Zones of harmfulness of leaf spot blotches pathogens. Collection of scientific works of Mironovsk science-research institute of wheat breeding and seeds production: Increasing of productiveness and stability of winter wheat yields production in USSR. Mironovka. p.134-39 (in Russian).
Sharma, R.C., Gyawali, S., Shrestha, S., Chaudhary, N.K., & Duveiller, E. 2003. Field resistance to Helminthosporium leaf blight in wheat genotypes from diverse origins. Proceedings of the Fourth International Wheat Tan Spot and Spot Blotch Workshop. July 21-24, 2002. Eds. J.B. Rasmussen, T.L. Friesen, & S. Ali. NDSU, Fargo. P.145-150.
Tupenevich, S.M. 1970. Root rot of spring wheat in droughty areas of North Kazakhstan and steppe areas of Western Siberia. In: Peresypkin, V.F. ed. Root rot of grain cereals and measures of struggle against them. Moscow: Kolos, P. 3 . 8 (in Russian)
Tupenevich, S.M., & Nesterov, A.N. 1977. Agronomical methods in protection of spring wheat against root rot in Northern Kazakhstan. In: Proc. VIZR, Isssue 56, P. 41.61 (in Russian)
Wiese, M.V. 1977. Compendium of wheat diseases. American Phytopathological Society. USA. 106 p.
Zdrazhevskaya, S.D. 1985. Ways of rational fungicide use against complex of aerogenic infection of spring wheat. In: Chemical method of protection of agricultural plants from fungus diseases. Leningrad; VIZR. P. 64 . 70 (in Russian)
Zdrazhevskaya, S.D., & Shugurov, I.M. 1991. Features of protection of spring durum wheat during vegetation from complex of diseases. In: Problems of protection of grain crops from Fusarium and other diseases, Minsk, p. 97-106 (in Russian)

Right and copyright:

All rights reserved. Copyright 2004 © L.A. Mikhailova & M.I.Saulich (vector map, description), L.A. Mikhailova (picture).

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