About pests and diseases of some magnolia species in the Absheron conditions

Abstract

The article examines the reproduction, frequency, distribution, density, preventive measures against pests of some Magnolia species on a scientific basis. Pests belonging to the species of this genus have been observed to be Icerya purchasi Mack, 1878, Ceroplastes sinensis Guer., Tetranychus urticae Koch., Helix pomatia Lin., 1758 and Pseudomonas syringae van Hall 1904. On the basis of phytosanitary monitoring, route observations and stationary examinations of magnolia plants grown in the experimental fields of the Institute of Dendrology in Absheron Peninsula (2020-2021), plant samples infected with pests and pathogens were collected and systematically analyzed. As a result of the monitoring of pests, magnolias were first discovered in Absheron: Icerya purchasi, Ceroplastes sinensis, Tetranychus urticae, Helix pomatia. Some bioecological features of the dangerous larvae of Icerya purchasi and Ceroplastes sinensis have been revealed. For the first time, a number of promising insecticides against their larvae have been selected. The data on the experimental work on the selection of drugs and their concentration as the most effective measure to control pest species are presented. The reason for the weakening of plants, and sometimes their death, is a complex of factors of negative impact: biotic harmful arthropods and damage by various diseases; abiotic unfavorable climatic conditions; anthropogenic violation of the soil cover and natural herbaceous vegetation, insufficient and untimely care of plants due to the limited funds allocated for this purpose.