In gardening, more than two thirds of the questions asked by consumers relate to the health problems of their plants. What are the main reasons why plants in the garden get sick? Thanks to Patrick Mioulane.
An aggressive environment
Nature practices the law of the strongest. The best adapted species end up dominating at the expense of the others. Thus, roses, fruit trees, chrysanthemums, vegetables, hollyhocks, to name a few, are more susceptible to pests and diseases than the average. In addition, the soil is not always ideally suited to the needs of each plant species. Inadequate soil weakens the plant because it feeds it poorly. Finally, aerial plankton, loaded with microorganisms transported by the wind, constitutes the main vector of garden diseases.
Plants from various geographic areas (heat, cold, drought, humidity, wind) are potential factors of disease and increase their sensitivity. In addition, very harsh winters play an aggravating factor with the introduction, in certain regions, of insufficiently hardy plants. And too mild winters prevent natural regulation of pests and twigs from hardening.
The sophistication of cultures
Plants and flowers are the subject of long selections and complex hybridizations. These plants thus created are more sensitive to the aggressions of their environment. Likewise for the lawn, made up of a mixture of very technical grasses.
Overly homogeneous cultures
The reduction in the number of cultivated plants weakens the biodiversity of animal populations which naturally respond to the pressures of pests and diseases. Conversely, the multiplicity of species is an asset to limit the impact of parasitic attacks. A simple hedge will preferably consist of a marriage of shrubs as varied as possible. To know more : www.upj.fr