Pests

Area of distribution and damage of Stephanitis pyri Fabr.

Object description Download GIS-layers

Authors:

Object specialist G.E. David'yan
GIS-specialist M.I. Saulich

Date of creation:

10.11.2004.

Scale:

1:20,000,000.

Accuracy of map:

Map was created using maps of scale 1:33,000,000 and information from published literature.

Projection:

"Alber's Equal Area Conic for the USSR", 9, 1001, 7, 100, 0, 44, 68, 0, 0.

Basic content:

Vector map consisting of 2 thematic layers. The area of distribution and zone of pest damage are shown by polygons.

Accuracy of classifier:

Within the area of distribution, only a zone of low damage was established in accordance with the extent of pest damage to fruit crops. Threshold of harmfulness of S. pyri on apple and pears at the end of blossoming is about 200 larvae and nymphs per 100 leaves. Threshold of harmfulness increases to 300 specimens of larvae and nymphs per 100 leaves during ripening of fruits. In the zone of low damage, the maximum harmfulness of S. pyri does not exceed 2 points on the 5-point scale of harmfulness (Kopaneva et al., 1984).

Mapping procedure:

Data from state publications were used to allocate the distribution area and the zone of pest damage. The map of the distribution area is based on Vasil'ev (1955, 1973), Saakyan (1974), Savkovskii (1976), Fol'kina (1980), and Krasil'nikova (1987). The northern border of the distribution area in the former USSR passes through Lutsk, Korosten', Chernihiv, Ramon', Saratov, Ural'sk, Orenburg, and Barnaul. These localities were marked in the coordinate system on a blank geographical map using standard GIS technologies. The borders of the zone of low damage were adapted to include economically significant areas of apple and pear cultivation within the S. pyri distribution area with the exception of forest-steppe areas. The zone of low damage includes southern Moldavia, Ukraine, the Caucasus, the Lower Volga River Basin, Southern Kazakhstan, and Central Asia. Borders of the zone of damage were mapped using Vasil'ev (1955, 1973), Saakyan (1974), Savkovskii (1976), Fol'kina (1980), Kopaneva (1984), and Krasil'nikova (1987).

Sources of data:

Batiashvili, I.D. 1959. Pests of continental and subtropical fruit crops. Tbilisi: Institut sel'skogo khozyaistva. 455 p. (in Russian).
Fol'kina, M.Ya. 1980. Stephanitis pyri F. in Southern Kazakhstan. Zashchita rastenii, 5: 39-40. (in Russian).
Kirichenko, A.N. 1949. Hemiptera (Heteroptera). In: Pavlovskii E.N. & Shtakelberg A.A., eds. Pest Animals of Middle Asia (handbook). Moscow & Leningrad: AN SSSR. P. 220-222 (in Russian).
Kopaneva, L.M., ed. 1984. Keys to harmful and useful insects and mites on fruit and berry plants in the USSR. Leningrad: Kolos. 288 p. (in Russian).
Krasil'nikova, G.A. 1987. Stephanitis pyri F. ж the pest of fruit crops. Agriculture of Turkmenistan (Ashkhabad), 6: 34-35. (in Russian).
Kryzhanovskii, O.L. & Danzig, E.M., ed. 1972. Pest insects and mites of agricultural plants, V. 1. Leningrad: Nauka. 323 p. (in Russian).
Saakyan, Z.A. 1974. Biological peculiarities of the Stephanitis pyri F. in NE of Armenia and control measures. PhD Thesis, Erevan. 38 p. (in Russian).
Savkovskii, P.P. 1976. Atlas of the pests of fruit and berry plants. Kiev: Urozhai. 207 p. (in Russian).
Vasil'ev, V.P. 1955. Pests of fruit crops. Kiev: AN Ukr.SSR. 265 p. (in Russian).
Vasil'ev, V.P., ed. 1973. Pests of agricultural crops and forest plantations. V. 1. Kiev: Urozhai. 496 p. (in Russian).

Right and copyright:

All rights reserved. Copyright 2004 © G.E. David'yan & M.I. Saulich (vector map, description).
Photo © V.V.Neymorovets (VIZR)