Question: query regarding management of blight in tomato. 
Answer: first you do the test for bacteria. if the water reman same then spray redomil gold or indofil m-45 3 gram per liter of water 3 times at 5 days interval in the evening time. if the water become yellowish white then use streptomycin or streptocyclin 2 gram/10 liter of water and also apply the some medicinal water near the root zone also.