In this article we will discuss about the external and internal symptoms of virus infection in plants. External Symptoms of Virus Infection: These are further divided into two main categories: (a) Primary symptoms and (b) Systemic symptoms. (a) Primary Symptoms: These are the initial symptoms and are the result of local reaction at the spot of inoculation. These symptoms appear [...]
The following points highlight the four main diseases caused by virus in plants. The diseases are: 1. Tobacco Mosaic 2. Cucumber Mosaic 3. Yellow Vein Mosaic of Bhindi 4. Little Leaf of Brinjal. Disease # 1. Tobacco Mosaic: This plant disease is caused by Tobacco Mosaic Virus (TMV). It is known to occur in all tobacco growing countries of the [...]
The following points highlight the two main bacterial diseases in plants. The bacterial diseases are: 1. Citrus Canker 2. Potato Scab. Bacterial Disease # 1. Citrus Canker: Fawcett and Jenkins (1933) reported that citrus canker disease is originated in India and Java because they have detected canker lesions on the oldest citrus herbaria kept at Royal Botanical Gardens in Kew. [...]