questions: query related to disease in tomato 
 answers: first perform the ooze test.
if bacterial disease then apply streptocyclin @ 1 gram per 5 litre water or plantomycin @ 2 ml per litre water, 3 sprays at 5 days interval
if fungal infection then apply bavistin @ 2 gram per litre water, 3 sprays at 5 days interval