AGRICULTURAL BIOLOGY, 2016, V. 51, ¹ 5, pp. 731-738 UDC 635.64:632.937 ISSN 2412-0324 (English ed. Online) (SEL’SKOKHOZYAISTVENNAYA BIOLOGIYA) ISSN 0131-6397 (Russian ed. Print) ISSN 2313-4836 (Russian ed. Online) doi: 10.15389/agrobiology.2016.5.731rus doi: 10.15389/agrobiology.2016.5.731eng ALLELOCHEMICS: AN INTERACTION BETWEEN PHYTOPHAGЕS AND Pseudomonas syringae pv. tomato ON TOMATO Solanum lycopersicum PLANTS E.A. STEPANYCHEVA, M.O. PETROVA, A.V. SHCHENIKOVA, T.D. CHERMENSKAYA All-Russian Research Institute of Plant Protection, Federal Agency of Scientific Organizations, 3, sh. <...> E.I. Savel’eva (Research Institute of Hygiene, Occupational Pathology and Ecology, the Federal Medical and Biological Agency) for carrying out chemical analysis of volatile compounds Received February 19, 2016 A b s t r a c t Until recently, induced resistance to pathogens and phytophages considered separately and only in recent years the attention are being paid to the possibility of an induced cross-resistance. <...> The aim of this work was to study the nature of the chemical interaction between plants and phytopathogenic microorganisms and arthropods phytophages, inhabiting the same ecological niche. <...> The possibility of mutually-modifying effects of phytophagous and pathogens on quantitative and qualitative indicators of the defense response of tomato plants were shown. <...> As the first order consumers the Western flower thrips Frankliniella occidentalis and whitefly Trialeurodes vaporariorum were chosen as most dangerous herbivores of greenhouse crops, and Pseudomonas syringae pv. tomato, a bacterial pathogen of tomato mottle, was used. <...> The evaluation criteria were the changes in behavioral responses of herbivores and their demographic parameteres, and for pathogen the degree of infection development was expressed in points. <...> Under the insects’ free choice, the tomato plants previously infected with P. syringae, were more preferable by thrips, while remained not more attractive for whitefly. <...> Attraction of thrips to infected plants may be due to the appearance and increasing content of volatile substances such as 2-methylbutanoic acid and dodecane, which are components of the thrips pheromone and allomons. <...> Under the primary damage of plants by thrips and whitefly the further pathogen development differed (e.g., the thrips suppressed the disease, while the whitefly served as promoters for its development). <...> Inhibition of the pathogen on plants damaged by thrips, may be due to an increase in the content <...>