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 [...]
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 [...]