In this article we will discuss about the mycoplasmal diseases of potato. (a) Purple Top Roll: The disease occurs particularly in North America but reported for the first time in India which can cause 15 to 20% of loss of Potato yield. Symptoms: The disease is characterised by rolling and purple or pink coloration of the basal part of leaflets [...]
In this article we will discuss about the loose smut of wheat caused by basidiomycetes. Introduction to the Loose Smut of Wheat: This disease is very common and widespread. It causes great damage in the wheat growing tracts of India, particularly in the Punjab, Uttar Pradesh and certain districts of Madhya Pradesh. Luthra (1953) reported that in India, the disease [...]
In this article we will discuss about the defence mechanisms of host. Interaction between host and pathogen is a complicated process during which dis-balance host metabolic processes and formation of defence chemicals — phenolic substances take place. With the help of defence chemicals the host tries to repel the attack of the pathogen. These chemicals are not only active against [...]