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Invasive Pests of Robinia pseudoacacia Foliage in Plantings of the Lower Volga region, Russia
* 1 , * 1 , * 1 , * 2 , * 2
1  Federal State Budget Scientific Institution «Federal Scientific Centre of Agroecology, Complex Melioration and Protective Afforestation of the Russian Academy (FSC of Agroecology RAS)
2  Volgograd State Social and Pedagogical University (VSSPU)
Academic Editor: António Onofre Soares


Plants of generic complex Robinia L., 1753 are characteristic of the dendroflora of the Lower Volga region. They are not native to the arid zone, their natural range is confind to North America. The beginning of the introduction of plants of this generic complex in Russia falls on the late 18th – early 19th centuries. They began to be used most massively in planting from the middle of the 20th century. Robinia species have been resistant to pests for many years. For the last decade, damage to the foliage of the robinia (whiteacacia) marginal gall midge Obolodiplosis robinia (Haldeman, 1847) (Diptera: Cecidomyiidae) and Nematus tibialis (Newman, 1837) (Hymenoptera, Tenthredinidae) has been recorded annually in the crowns of Robinia pseudoacacia L. On the territory of the Russian Federation, gall midge was first recorded in 2006 and by 2010, it reaches the Volgograd region. Here, Obolodiplosis robiniae successfully masters the assimilation apparatus of Robinia of different ages in plantations of various types and ecological categories. The density of galls in plantings on average is 1.9 pcs. / leaf, the maximum is 7.0 pcs. / leaf. Since 2017, on the territory of the Lower Volga region, Nematus tibialis has been recorded in plantations with the participation of woody plants of the genus Robinia. This pest prefers the foliage of trees of intra-quarter plantings and squares located near buildings or adjacent to them. On average, the density of larvae in the crown of a tree is 2.12 pcs. / leaf.

Keywords: Robinia; Obolodiplosis robiniae; Nematus tibialis; invader insects; pests; abundance; plant-ings