Its been thrice. i'm gettin' fungal contamination in some of the shoot- culture of Origanum vulgare. I'm constantly monitoring the time of treatment with the bavistin and HgCl2 and yet some culture dies and rest in majority gets contaminated. Plz s'one suggest me tips to get rid of this dilemma. If you have your own protocol for In-vitro multiplication of shoot of O.vulgare