reported that late blight can induce 100% yield loss under epidemic condition in Pakistan. The yield losses due to late blight of potato were reported up to 50–70% during the 2007 under favorable environmental condition in Pakistan however recently Ahmed et al. The losses caused by late blight disease, it varied countries to countries, as per their adopted plant protections measures and grown cultivars. The late blight disease is considered emerging disease, it is not only having important in global crop production, but also pose severe risks on a local level, especially on small farms in developing countries. The worldwide late blight disease is re-emerging, therefore this disease is constantly observed by the late blight researchers. It is a highly researchable pathogen in plant diseases. It is not cause only economic losses of yield but also the quality and quantity of the crop. Phytophthora infestans causes late blight diseases in potato and tomato crops worldwide. Afterwards, appearance of late blight disease is regular feature with high disease severity in hill areas while in plains disease severity is moderate to high level. In Gujarat and Madhya Pradesh, the disease was observed in traces in 1968 and in Rajasthan in 1958. Potatoes had been grown in Mahabaleshwar hills and other parts of Maharashtra but late blight was observed there only in 1973. In Punjab, the disease was occurred annually from 1958 to 1963 except during 1961. Severe attack of the late blight was observed in Meerut district in 1949, 19 and subsequently in many other districts of Uttar Pradesh. In plains of Uttar Pradesh, it was reported for the first time in 1943 in Dehradun and Meerut. During 1913, it appeared at several places in Assam and Bihar. The late blight disease was observed in Khasi hills (North-eastern Region) in 1885, Kumaon hills in 1897 and in Shimla hills (North-western Region) in 1902. In the northern part, it appeared for the first time in 1883 in Darjeeling and subsequently spread rapidly to other adjoining hills. Under subtropical plains particularly in eastern part of the India, it was first observed in 1898–1900 in Hooghly district of West Bengal. The late blight disease was recorded in India for the first time between 18 in the Nilgiri hills. One million people died of starvation due to that famine and another million migrated to the USA and other parts of the world. The entire potato crop across Europe, especially in Ireland, was killed prematurely during 1844–45 leading to worst ever famine the ‘Irish Potato Famine’. The late blight disease caused by oomycete, which was initially reported as Botrytis infestans in 1845 by C. Montagne, later on German scientist Anton de Bary renamed as Phytophthora infestans (Mont.) de Bary. The late blight fungus co-evolved with potato in Central and South America and subsequently spread to other parts of the world mainly through infected seed tubers. In Asia, particularly in India, it was introduced by Portuguese in 17th century. The Potato was originated in the hills of Andes and Bolivia in South America, subsequently it was introduced into Europe by Spaniards in the second half of the 16th century, from there it spread throughout Europe and rest of the world in the mid 17th to mid of 18th century. Nowadays biological control is gaining importance due to its eco-friendly in nature. Several fungicides including contact, systemic and translaminar have been evaluated from time to time however, the pathogen has shown a remarkable capacity for change with respect to host genotype and fungicides. infestans the resistance of the varieties is wiped out within a decade. However, due to very divers’ virulence nature of P. The host resistance is best option for management of this disease. The cultural practices will also helpful in reducing inoculum load and managing the disease. As infected potato tubers cause the primary sources of infection in next season. Forecasting is the better option for management of late blight, if accurately forecasted and promptly information reaches to the end users. Management strategies includes forecasting, cultural, biological, varietal and chemical management. The factors which are responsible for huge yield loss of potato are applied improper management strategies and pathogen behavior. Moreover, this disease is re-emerging in the forms of different genotypes and causes huge yield loss in the potato crop. Potato (Solanum tuberosum L.) is the most important crop and Phytophthora infestans (Mont.) de Bary is the oomycete, which was responsible for infamous Irish potato famine during 1843–45 and it continues to cause worldwide devastation of the potato.
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