In this article we will discuss about the bacterial and viral diseases of plants. Bacterial Diseases of Plants: The first recorded observation on a bacterial disease of plants dates back to the work of Burrill (1881), who discovered the causative organism of pear blight. This work was confirmed by Waite (1891), who isolated the etiological agent and proved its pathogenicity. [...]
In this article we will discuss about the classification of plant diseases. I. Non-Parasitic or Abiotic Diseases: These are induced by unfavourable environmental conditions of soil or air such as mineral deficiencies or excesses in the soil, low or high temperatures, improper water, oxygen and light relations. The non-parasitic diseases may also be caused by mechanical injuries. Common examples of [...]
In this article we will discuss about the general symptoms of plant diseases. The changes in the host plant which serve to recognise the disease are called the signs and symptoms of the disease. The sign of a disease is the external appearance of some portion of the pathogen of the host. It may be some portion of the [...]