invasion is the importation of the sawfly in its preimaginal phases with the planting material, followed by independent expansion of imagoes. the absence of broadleaved peony species in the natural ecosystems of the steppe zone is a key factor constraining the expansion of the T. talyshensis range. During mass reproduction, it causes serious damage to flower-decorative plantings.
Citrus crops are the most important among subtropical crops in the Republic of Abkhazia. In 2019-2020 a new pest was discovered in the citrus agrocenosis of Abkhazia – the woolly whitefly Aleurothrixus floccosus (Maskell). The pest has been identified in all regions of the country. The degree of damage to mandarin on industrial plantations reaches 50% and more. An assessment of the resistance of 79 varieties of citrus crops from the collection of the Institute of Agriculture of the Academy of Sciences of Abkhazia to damage by a woolly whitefly (Gulrypsh district of the Republic of Abkhazia) was carried out. The degree of damage to citrus genotypes was different. It was found that the most affected varieties are Citrus limon (L.) Osbeck, as well as C. × meyeri and C. aurantifolia Sw. Tangerine, orange varieties (Hamlin, Maro and Grushevidny Koroliok) and pompelmus varieties (Mato Buntan, Natsu mican, Meteleva) are the least damaged.
The unique natural and climatic conditions of the region became prerequisites for agricultural science development and for formation of Abkhazia as the largest introduction place. The paper considers a working period of Sukhum Horticultural and Agricultural Experimental Station from 1894 to 2017, its structure and the main research directions. It also briefly describes the journal "Black Sea Agriculture" published at that time, the main task of which was to combine research results and observations of agricultural institutions of the Black Sea coast and individuals.
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