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 structural and biochemical defense mechanisms in plants I. Structural Defense: In plants some structures are already present to defend the attack while in others, the structures to defend the host develops after the infection. In this way, structural defense can be characterised as (A) Preexisting defense structures and (B) Defense structures developed [...]
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 [...]