Diseases and pests on Bulgarian oil-bearing rose (Rosa kazanlika V.T.=Rosa damascena Mill. var. kazanlika)

摘要

Oil-bearing rose is the most important essential oil crop in Bulgaria. During the period 1993-1996, regular observations were conducted at 10-day intervals in the experimental field of the Research Institute for Roses, Aromatic and Medicinal Plantsin Kazanlik, and in the adjacent rose plantations, to clarify pest and disease appearance, development, density, distribution and damage on roses. The most severe diseases on roses were caused by rust (Phragmidium mucronatum) and black spot (Diplocarponrosae). Of the rose-attacking pests, the cane borer (Agrilus cuprescens), rose curculio (Homalorhynchites hungaricus), rose scale insect (Rhodococcus bulgariensis), rose chafer (Epicometis hirta) and Phyllopertha horticola proved to be the most destructive. A tendency towards a gradual increase of the population density of pests of no economic significance was also recorded.