Tea is the most popular and inexpensive beverage produced from the young shoots of tea plant. Tea is grown in more than 50 countries, mostly in plantations. A large number of pathogenic organisms are specialized in attacking different parts of the plant. The crop loss in tea due to pests and diseases is around 10-15%. Among the stem diseases, collar/Phomopsis canker is very important. The disease is caused by the fungus Phomosis theae Petch, belongs to the Deuteromycetes. Although phomopsis canker is known for over 40 years in south India, the disease has become a major problem only in recent...