Tomato is the most popular vegetable grown under wide range of agro climatic conditions. High relative humidity and warm temperature, which favour the luxuriant plant growth was congenial for the development of various fungal, bacterial and viral diseases (Balanchard, 1992). Among the fungal diseases, early blight caused by Alternaria spp. is the most threatening biological constraint in tomato cultivation with yield losses ranging from 50 to 86 per cent (Mathur and Shekhawat, 1986). Role of weather parameters such as temperature and relative humidity in disease development has been reported by Dragomir (1995), Gupta and Paul (2001) and Pandey (2011). However, precise information is not available on the epidemiological aspects of this disease under coastal conditions of Andhra Pradesh where the crop
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