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 [...]
The following points highlight the two main principles for controlling plant diseases. The principles are: 1. Prevention or Prophylaxis 2. Cure. Principle # 1. Prevention or Prophylaxis: It is the protection of the host from infection and exposure to pathogen. Prevention includes a wide variety of control measures. These are: 1. Immunity: It means the resistance of the host to [...]