The influence of abiotic factors on the seasonal dynamics of the abundance of Cameraria Ohridella Deschka & Dimic in the Nikitsky Botanical Gardens

Abstract

The results of the test of the synthetic sex pheromone C. ohridella are presented. Its attractiveness, species specificity and duration of action are determined. In the period from 2017 to 2021, studies were conducted on the use of synthetic sex pheromone to study the seasonal dynamics of the number of Cameraria ohridella Deschka & Dimič in the Nikitsky Botanical Gardens. Horse chestnut Aesculus hippocastanum L. served as model plants. For trapping, traps of the "Delta" type produced by the FSFI "VNIIKR" (Moscow) were used. The number of captured individuals was calculated in the laboratory. It has been established that the development of C. ohridella occurs in three complete generations. Imagos of the first generation appear in the III decade of March - I decade of April, with the sum of effective temperatures (SET˃10) averaging 33.6°C. The imago of the second generation was recorded in the second decade of June at SET˃10, on average 491.0°C, while individuals of the third generation of phytophagans appear in the third decade of July at SET˃10, on average - 1092.3 ° C. It was found that the dynamics of the population of C. ohridella depends on temperature conditions, the correlation coefficient was 0.8 with a significance level of p (0.0001) <0.05. During the research period, more than 25,000 individuals of the pest were caught in traps with synthetic sexual pheromone. The high number of the pest indicates the presence of favorable conditions for the development of the phytophagan and the absence of factors limiting its spread, which allows it to gradually expand its range.