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 [...]
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 [...]