Vol. 10, Issue 11 (2021)

Author(s):
S Vijay, P Renukadevi, P Mangammal and SV Krishnamoorthy

Abstract:
Mulberry (Morus spp.,) is an important crop for rearing silkworm and sole food to the mulberry silkworm. The black root rot caused by Lasiodiplodia theobromae is an important soil borne disease results in major yield loss in mulberry production. The present study investigates the effect of media, temperature and pH on the growth of L. theobromae under in vitro. Among the five media tested, potato dextrose medium recorded highest mycelial growth (90 mm) and with good Pycnidial production (52 numbers) in Petri plate. Maximum mycelial growth (85.16 to 90 mm) of L. theobromae was observed at temperature range from 25 to 35^oC and no growth (0 mm) was observed at 10 and 40 ^oC. The mycelial growth of L. theobromae was maximum at pH 7 (90 mm) with 54 numbers of Pycnidial production.