Effect of different varieties of Raphanus sativus as bio-fumigants and microbial biocontrol agents for the management of Pythium aphanidermatum causing damping off in tomatoPantnagar Journal of Research, Volume - 20, Issue - 2 ( May-August 2022)
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The study was conducted to evaluate the effect of root and shoots of different varieties of Raphanus sativus as biofumigant alone and in combination with PBAT-3 (Trichoderma and Pseudomonas) against Pythium aphanidermatum causing pre and post emergence damping off of tomato under glasshouse and in the field conditions. Volatiles released from three varieties of R. sativus viz,. Japanese white, Pusa Chetki, and MAHY 22 significantly reduced the mycelial growth of P. aphanidermatum. Roots of MAHY 22 was found to be most effective as resulted into maximum radial growth inhibition 82.06 per cent followed by Japanese white shoot. Under glasshouse, minimum pre and post emergence damping off was observed in combination of MAHY 22 root +PBAT-3 (11.1%) and Japanese white +PBAT-3 (5.2%) respectively over control. Whereas, in field, minimum pre and post emergence damping off was recorded in MAHY 22 root +PBAT-3 i.e., 15.16 per cent and 4.20 per cent respectively over control. Similarly, the combination of biofumigation and biocontrol agents resulted in higher seedling emergence. The results showed R. sativus as biofumigant alone and in combination with PBAT-3 in suppressing the growth of P. aphanidermatum both in vitro and in vivo conditions.
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