Distribution features of Xanthogaleruca luteola (Coleoptera: Chrysomelidae) in the protective plantings of the Lower Volga
O.S. Filimonova, M.N. Belitskaya, I.R. Gribust
Section: Population ecology
Presented data on the features of ecology of economically dangerous pest - Xantogaleruca luteola (Coleoptera: Chrysomelidae). The development of leaf beetle occurs exclusively on woody plants of the Ulmus L. ancestral complex, which account for about 80% of the total composition of dendroflora in the Lower Volga. In the conditions of the study region, phyllophage is recorded on U. glabra, U. pumila, U. laevis. The greatest degree of foliage damage is noted for hornbeam elm, in the crown of which the defoliation level reaches 93%. This species prefers to populate the lower tier of the crown of trees, where when illumination is no more than 1500 lux, the maximum density of leaf food is recorded (more than 40 individuals per 100 leaves). The quantitative abundance of the pest is subject to significant fluctuations under the influence of weather conditions. During the drought period, there is a sharp hanging of the population density due to the weakening of trees. The regulatory factor limiting the growth of leaf beetle is the aggravation of intraspecific relations with an increase in population density, which entails a decrease in the potential for reproduction. So, the number of eggs in the clutches of females after leaving the diapause fluctuates at the level of 21-23 pcs/100 leaves. When the pest is restored, the number of eggs in the clutches of the II generation decreases by 22.1%. It was revealed that the number of clutches and eggs in the clutch varies significantly from a species of woody plant. The Imago mainly lays eggs in the crown of U. glabra, while the number of eggs in the clutch is minimal. The established differences are obviously related to the preference of hornbeam elm as a fodder plant, which entails an increase in population density and the number of masonry on the leaves in the crown of this type of elm. The decrease in the number of eggs in the clutch is due to the development of stress in females with a high frequency of contacts between individuals. Thus, the presence of mechanisms for regulating the abundance of ilm leaf beetle indicates the successful adaptation of the pest to the conditions of the Lower Volga.
Keywords: phyllophages, Xanthogaleruca luteola, Ulmus, Lower Volga
Article published in number 2 for 2022 DOI: 10.25750/1995-4301-2022-2-124-129
ISSN 1995-4301
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