questions: control measure of ulcer 
 answers: apply lime at the rate of 10- 15 kg/bigha of water spread area depending on ph of water.
after 1- 2 days of application of lime to the pond water spraying of “sukrena w.s.” over the
pond water surface at the rate of 500ml/ bigha water spread area. repeat the application of
sukrena w.s. to the infected pond for 2nd or 3rd times depending on the need basis at 10 –15
days interval.